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Zhiming Zhang - One of the best experts on this subject based on the ideXlab platform.

  • microstructure of a safe end Dissimilar Metal weld joint sa508 52 316l prepared by narrow gap gtaw
    Materials Characterization, 2017
    Co-Authors: Hongliang Ming, Jianqiu Wang, Zhiming Zhang, Peipei Wang
    Abstract:

    Abstract The microstructure, residual strain and interfacial chemical composition distribution of a safe-end Dissimilar Metal weld joint (DMWJ, SA508-52-316L) prepared by narrow-gap gas-tungsten arc welding (NG-GTAW) were studied by optical microscope (OM) and scanning electron microscope equipped with an energy dispersive X-ray microanalysis (SEM/EDX) and an electron back scattering diffraction (EBSD) system. Complex microstructure and chemical composition distribution are found, especially at the SA508-52 interface and the 52-316L interface. In brief, a complicated microstructure transition exists within the SA508 heat affected zone (HAZ); the residual strain, the fraction of high angle random grain boundaries and low angle boundaries decrease with increasing the distance from the fusion boundary in 316L HAZ; neither typical type II boundary nor obvious carbon-depleted zone is found near the SA508-52 interface; dramatic and complicated changes of the contents of the main elements, Fe, Cr and Ni, are observed at the distinct interfaces, especially at the SA508-52 interface. No carbon concentration is found at the SA508-52 interface.

  • stress corrosion cracking of 316l haz for 316l stainless steel inconel 52m Dissimilar Metal weld joint in simulated primary water
    Corrosion Science, 2016
    Co-Authors: Jianqiu Wang, Litao Zhang, Zhiming Zhang
    Abstract:

    Abstract The stress corrosion cracking (SCC) behaviour of 316L heat affected zones (HAZ) in 316L stainless steel/Inconel 52M Dissimilar Metal welded joint (DMWJ) in simulated primary water was systematically evaluated using direct current potential drop (DCPD) methods. Crack growth rates (CGRs) of 316L HAZ increased with increasing temperature and dissolved oxygen (DO) contents. CGR in hydrogenated water was approximately one order of magnitude slower than in oxygenated water. The fracture surface shows typical mixed intergranular-transgranular SCC characteristics and several fast finger-like cracks. Several intergranular secondary cracks, perpendicular to the main crack and fusion boundary, were also observed.

  • microstructure local mechanical properties and stress corrosion cracking susceptibility of an sa508 52m 316ln safe end Dissimilar Metal weld joint by gtaw
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016
    Co-Authors: Hongliang Ming, Jianqiu Wang, Zhiming Zhang, Wei Ke, Mingxing Su
    Abstract:

    Abstract The microstructure, local mechanical properties and local stress corrosion cracking susceptibility of an SA508-52M-316LN domestic Dissimilar Metal welded safe-end joint used for AP1000 nuclear power plant prepared by automatic gas tungsten arc welding was studied in this work by optical microscopy, scanning electron microscopy (with electron back scattering diffraction and an energy dispersive X-ray spectroscopy system), micro-hardness testing, local mechanical tensile testing and local slow strain rate tests. The micro-hardness, local mechanical properties and stress corrosion cracking susceptibility across this Dissimilar Metal weld joint vary because of the complex microstructure across the fusion area and the dramatic chemical composition change across the fusion lines. Briefly, Type I boundaries and Type II boundaries exist in 52Mb near the SA508-52Mb interface, a microstructure transition was found in SA508 heat affected zone, the residual strain and grain boundary character distribution changes as a function of the distance from the fusion boundary in 316LN heat affected zone, micro-hardness distribution and local mechanical properties along the DMWJ are heterogeneous, and 52Mw-316LN interface has the highest SCC susceptibility in this DMWJ while 316LN base Metal has the lowest one.

  • Stress corrosion cracking of 316L HAZ for 316L stainless steel/Inconel 52M Dissimilar Metal weld joint in simulated primary water
    Corrosion Science, 2016
    Co-Authors: Ruolin Zhu, Jianqiu Wang, Litao Zhang, Zhiming Zhang, En Hou Han
    Abstract:

    The stress corrosion cracking (SCC) behaviour of 316L heat affected zones (HAZ) in 316L stainless steel/Inconel 52M Dissimilar Metal welded joint (DMWJ) in simulated primary water was systematically evaluated using direct current potential drop (DCPD) methods. Crack growth rates (CGRs) of 316L HAZ increased with increasing temperature and dissolved oxygen (DO) contents. CGR in hydrogenated water was approximately one order of magnitude slower than in oxygenated water. The fracture surface shows typical mixed intergranular-transgranular SCC characteristics and several fast finger-like cracks. Several intergranular secondary cracks, perpendicular to the main crack and fusion boundary, were also observed.

  • microstructural characterization of an sa508 309l 308l 316l domestic Dissimilar Metal welded safe end joint
    Materials Characterization, 2014
    Co-Authors: Hongliang Ming, Jianqiu Wang, Zhiming Zhang, Wei Ke
    Abstract:

    Abstract The microstructure of an SA508–309L/308L–316L domestic Dissimilar Metal welded safe-end joint was characterized in this work by optical microscopy, scanning electron microscopy (with electron back scattering diffraction) and micro-hardness testing. Epitaxial growth and competitive growth are evident in the 308L–316L fusion boundary regions. A martensite layer, carbon-depleted zones, and type-II and type-I boundaries are found in the SA508–309L fusion boundary regions, while only martensite and austenite mixed zones are observed in the SA508–308L fusion boundary regions. The microstructure near the fusion boundary and the microstructure transition in the SA508 heat affected zone are quite complex. Both for SA508–309L/308L and 308L–316L, the highest residual strain is located on the outside of the weldment. The residual strain and the grain boundary character distribution change with increasing distance from the fusion boundary in the heat affected zone of 316L. Micro-hardness measurements also reveal non-uniform mechanical properties across the weldment.

Jianqiu Wang - One of the best experts on this subject based on the ideXlab platform.

  • microstructure of a safe end Dissimilar Metal weld joint sa508 52 316l prepared by narrow gap gtaw
    Materials Characterization, 2017
    Co-Authors: Hongliang Ming, Jianqiu Wang, Zhiming Zhang, Peipei Wang
    Abstract:

    Abstract The microstructure, residual strain and interfacial chemical composition distribution of a safe-end Dissimilar Metal weld joint (DMWJ, SA508-52-316L) prepared by narrow-gap gas-tungsten arc welding (NG-GTAW) were studied by optical microscope (OM) and scanning electron microscope equipped with an energy dispersive X-ray microanalysis (SEM/EDX) and an electron back scattering diffraction (EBSD) system. Complex microstructure and chemical composition distribution are found, especially at the SA508-52 interface and the 52-316L interface. In brief, a complicated microstructure transition exists within the SA508 heat affected zone (HAZ); the residual strain, the fraction of high angle random grain boundaries and low angle boundaries decrease with increasing the distance from the fusion boundary in 316L HAZ; neither typical type II boundary nor obvious carbon-depleted zone is found near the SA508-52 interface; dramatic and complicated changes of the contents of the main elements, Fe, Cr and Ni, are observed at the distinct interfaces, especially at the SA508-52 interface. No carbon concentration is found at the SA508-52 interface.

  • stress corrosion cracking of 316l haz for 316l stainless steel inconel 52m Dissimilar Metal weld joint in simulated primary water
    Corrosion Science, 2016
    Co-Authors: Jianqiu Wang, Litao Zhang, Zhiming Zhang
    Abstract:

    Abstract The stress corrosion cracking (SCC) behaviour of 316L heat affected zones (HAZ) in 316L stainless steel/Inconel 52M Dissimilar Metal welded joint (DMWJ) in simulated primary water was systematically evaluated using direct current potential drop (DCPD) methods. Crack growth rates (CGRs) of 316L HAZ increased with increasing temperature and dissolved oxygen (DO) contents. CGR in hydrogenated water was approximately one order of magnitude slower than in oxygenated water. The fracture surface shows typical mixed intergranular-transgranular SCC characteristics and several fast finger-like cracks. Several intergranular secondary cracks, perpendicular to the main crack and fusion boundary, were also observed.

  • microstructure local mechanical properties and stress corrosion cracking susceptibility of an sa508 52m 316ln safe end Dissimilar Metal weld joint by gtaw
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016
    Co-Authors: Hongliang Ming, Jianqiu Wang, Zhiming Zhang, Wei Ke, Mingxing Su
    Abstract:

    Abstract The microstructure, local mechanical properties and local stress corrosion cracking susceptibility of an SA508-52M-316LN domestic Dissimilar Metal welded safe-end joint used for AP1000 nuclear power plant prepared by automatic gas tungsten arc welding was studied in this work by optical microscopy, scanning electron microscopy (with electron back scattering diffraction and an energy dispersive X-ray spectroscopy system), micro-hardness testing, local mechanical tensile testing and local slow strain rate tests. The micro-hardness, local mechanical properties and stress corrosion cracking susceptibility across this Dissimilar Metal weld joint vary because of the complex microstructure across the fusion area and the dramatic chemical composition change across the fusion lines. Briefly, Type I boundaries and Type II boundaries exist in 52Mb near the SA508-52Mb interface, a microstructure transition was found in SA508 heat affected zone, the residual strain and grain boundary character distribution changes as a function of the distance from the fusion boundary in 316LN heat affected zone, micro-hardness distribution and local mechanical properties along the DMWJ are heterogeneous, and 52Mw-316LN interface has the highest SCC susceptibility in this DMWJ while 316LN base Metal has the lowest one.

  • Stress corrosion cracking of 316L HAZ for 316L stainless steel/Inconel 52M Dissimilar Metal weld joint in simulated primary water
    Corrosion Science, 2016
    Co-Authors: Ruolin Zhu, Jianqiu Wang, Litao Zhang, Zhiming Zhang, En Hou Han
    Abstract:

    The stress corrosion cracking (SCC) behaviour of 316L heat affected zones (HAZ) in 316L stainless steel/Inconel 52M Dissimilar Metal welded joint (DMWJ) in simulated primary water was systematically evaluated using direct current potential drop (DCPD) methods. Crack growth rates (CGRs) of 316L HAZ increased with increasing temperature and dissolved oxygen (DO) contents. CGR in hydrogenated water was approximately one order of magnitude slower than in oxygenated water. The fracture surface shows typical mixed intergranular-transgranular SCC characteristics and several fast finger-like cracks. Several intergranular secondary cracks, perpendicular to the main crack and fusion boundary, were also observed.

  • microstructural characterization of an sa508 309l 308l 316l domestic Dissimilar Metal welded safe end joint
    Materials Characterization, 2014
    Co-Authors: Hongliang Ming, Jianqiu Wang, Zhiming Zhang, Wei Ke
    Abstract:

    Abstract The microstructure of an SA508–309L/308L–316L domestic Dissimilar Metal welded safe-end joint was characterized in this work by optical microscopy, scanning electron microscopy (with electron back scattering diffraction) and micro-hardness testing. Epitaxial growth and competitive growth are evident in the 308L–316L fusion boundary regions. A martensite layer, carbon-depleted zones, and type-II and type-I boundaries are found in the SA508–309L fusion boundary regions, while only martensite and austenite mixed zones are observed in the SA508–308L fusion boundary regions. The microstructure near the fusion boundary and the microstructure transition in the SA508 heat affected zone are quite complex. Both for SA508–309L/308L and 308L–316L, the highest residual strain is located on the outside of the weldment. The residual strain and the grain boundary character distribution change with increasing distance from the fusion boundary in the heat affected zone of 316L. Micro-hardness measurements also reveal non-uniform mechanical properties across the weldment.

En Hou Han - One of the best experts on this subject based on the ideXlab platform.

  • Stress corrosion cracking of 316L HAZ for 316L stainless steel/Inconel 52M Dissimilar Metal weld joint in simulated primary water
    Corrosion Science, 2016
    Co-Authors: Ruolin Zhu, Jianqiu Wang, Litao Zhang, Zhiming Zhang, En Hou Han
    Abstract:

    The stress corrosion cracking (SCC) behaviour of 316L heat affected zones (HAZ) in 316L stainless steel/Inconel 52M Dissimilar Metal welded joint (DMWJ) in simulated primary water was systematically evaluated using direct current potential drop (DCPD) methods. Crack growth rates (CGRs) of 316L HAZ increased with increasing temperature and dissolved oxygen (DO) contents. CGR in hydrogenated water was approximately one order of magnitude slower than in oxygenated water. The fracture surface shows typical mixed intergranular-transgranular SCC characteristics and several fast finger-like cracks. Several intergranular secondary cracks, perpendicular to the main crack and fusion boundary, were also observed.

Litao Zhang - One of the best experts on this subject based on the ideXlab platform.

  • stress corrosion cracking of 316l haz for 316l stainless steel inconel 52m Dissimilar Metal weld joint in simulated primary water
    Corrosion Science, 2016
    Co-Authors: Jianqiu Wang, Litao Zhang, Zhiming Zhang
    Abstract:

    Abstract The stress corrosion cracking (SCC) behaviour of 316L heat affected zones (HAZ) in 316L stainless steel/Inconel 52M Dissimilar Metal welded joint (DMWJ) in simulated primary water was systematically evaluated using direct current potential drop (DCPD) methods. Crack growth rates (CGRs) of 316L HAZ increased with increasing temperature and dissolved oxygen (DO) contents. CGR in hydrogenated water was approximately one order of magnitude slower than in oxygenated water. The fracture surface shows typical mixed intergranular-transgranular SCC characteristics and several fast finger-like cracks. Several intergranular secondary cracks, perpendicular to the main crack and fusion boundary, were also observed.

  • Stress corrosion cracking of 316L HAZ for 316L stainless steel/Inconel 52M Dissimilar Metal weld joint in simulated primary water
    Corrosion Science, 2016
    Co-Authors: Ruolin Zhu, Jianqiu Wang, Litao Zhang, Zhiming Zhang, En Hou Han
    Abstract:

    The stress corrosion cracking (SCC) behaviour of 316L heat affected zones (HAZ) in 316L stainless steel/Inconel 52M Dissimilar Metal welded joint (DMWJ) in simulated primary water was systematically evaluated using direct current potential drop (DCPD) methods. Crack growth rates (CGRs) of 316L HAZ increased with increasing temperature and dissolved oxygen (DO) contents. CGR in hydrogenated water was approximately one order of magnitude slower than in oxygenated water. The fracture surface shows typical mixed intergranular-transgranular SCC characteristics and several fast finger-like cracks. Several intergranular secondary cracks, perpendicular to the main crack and fusion boundary, were also observed.

Ruolin Zhu - One of the best experts on this subject based on the ideXlab platform.

  • Stress corrosion cracking of 316L HAZ for 316L stainless steel/Inconel 52M Dissimilar Metal weld joint in simulated primary water
    Corrosion Science, 2016
    Co-Authors: Ruolin Zhu, Jianqiu Wang, Litao Zhang, Zhiming Zhang, En Hou Han
    Abstract:

    The stress corrosion cracking (SCC) behaviour of 316L heat affected zones (HAZ) in 316L stainless steel/Inconel 52M Dissimilar Metal welded joint (DMWJ) in simulated primary water was systematically evaluated using direct current potential drop (DCPD) methods. Crack growth rates (CGRs) of 316L HAZ increased with increasing temperature and dissolved oxygen (DO) contents. CGR in hydrogenated water was approximately one order of magnitude slower than in oxygenated water. The fracture surface shows typical mixed intergranular-transgranular SCC characteristics and several fast finger-like cracks. Several intergranular secondary cracks, perpendicular to the main crack and fusion boundary, were also observed.