The Experts below are selected from a list of 2331 Experts worldwide ranked by ideXlab platform

Jialong Tian - One of the best experts on this subject based on the ideXlab platform.

  • microstructure characteristics of segregation zone in 17 4ph stainless steel Piston Rod
    Journal of Iron and Steel Research International, 2017
    Co-Authors: Jialong Tian, Wei Wang, Zhouhua Jiang, Yiyin Shan, Ke Yang
    Abstract:

    The segregation of Cu and Ni in a 17-4PH stainless steel Piston Rod has been confirmed to be responsible for the cracking after heat treatment. Further investigation showed that the segregation zone was composed of three layers, namely the fine grain martensitic layer, the coarse grain martensitic layer and the coarse grain austenitic layer from the matrix to the crack surface. Three button ingots with the same chemical compositions as those three layers have been prepared to evaluate the grain size distribution, microstructure and mechanical properties. The effects of Cu and Ni segregation on the microstructures of those three layers have been explored by thermodynamic calculation. Based on the microstructure and mechanical properties results, an intensive understanding of the cracking in the segregation zone was therefore reached.

  • cracking due to cu and ni segregation in a 17 4 ph stainless steel Piston Rod
    Engineering Failure Analysis, 2016
    Co-Authors: Jialong Tian, Wei Wang, Zhouhua Jiang, Yiyin Shan, Ke Yang
    Abstract:

    Abstract The 17-4 PH stainless steel is employed to pRoduce Piston Rods in industry due to the high strength and toughness, good workability and nice corrosion resistance. In the present failure analysis, obvious long cracks were observed along the longitudinal direction on the surface of the commercial 17-4 PH stainless steel Piston Rod after heat treatment. The cracks were carefully looked into by observing the crack tip and characterizing the microstructure along the cracks. The results showed that the cracks were mostly initiated from the surface of the Rod and propagated along the phase boundary between martensite and δ ferrite. The EDXA showed that the segregation of Cu and Ni should be responsible for the cracking after heat treatment. In order to define when the crack was coming into being, oxidation film along the crack was considered as a clue. The scrutiny of the oxidation film on the crack edge illustrated that the crack should be formed right in the heat treatment of aging.

Ke Yang - One of the best experts on this subject based on the ideXlab platform.

  • microstructure characteristics of segregation zone in 17 4ph stainless steel Piston Rod
    Journal of Iron and Steel Research International, 2017
    Co-Authors: Jialong Tian, Wei Wang, Zhouhua Jiang, Yiyin Shan, Ke Yang
    Abstract:

    The segregation of Cu and Ni in a 17-4PH stainless steel Piston Rod has been confirmed to be responsible for the cracking after heat treatment. Further investigation showed that the segregation zone was composed of three layers, namely the fine grain martensitic layer, the coarse grain martensitic layer and the coarse grain austenitic layer from the matrix to the crack surface. Three button ingots with the same chemical compositions as those three layers have been prepared to evaluate the grain size distribution, microstructure and mechanical properties. The effects of Cu and Ni segregation on the microstructures of those three layers have been explored by thermodynamic calculation. Based on the microstructure and mechanical properties results, an intensive understanding of the cracking in the segregation zone was therefore reached.

  • cracking due to cu and ni segregation in a 17 4 ph stainless steel Piston Rod
    Engineering Failure Analysis, 2016
    Co-Authors: Jialong Tian, Wei Wang, Zhouhua Jiang, Yiyin Shan, Ke Yang
    Abstract:

    Abstract The 17-4 PH stainless steel is employed to pRoduce Piston Rods in industry due to the high strength and toughness, good workability and nice corrosion resistance. In the present failure analysis, obvious long cracks were observed along the longitudinal direction on the surface of the commercial 17-4 PH stainless steel Piston Rod after heat treatment. The cracks were carefully looked into by observing the crack tip and characterizing the microstructure along the cracks. The results showed that the cracks were mostly initiated from the surface of the Rod and propagated along the phase boundary between martensite and δ ferrite. The EDXA showed that the segregation of Cu and Ni should be responsible for the cracking after heat treatment. In order to define when the crack was coming into being, oxidation film along the crack was considered as a clue. The scrutiny of the oxidation film on the crack edge illustrated that the crack should be formed right in the heat treatment of aging.

D.c. Moreira - One of the best experts on this subject based on the ideXlab platform.

  • Failure analysis of AISI 410 stainless-steel Piston Rod in spillway floodgate
    Engineering Failure Analysis, 2019
    Co-Authors: J.s. Buarque, H.c. Furtado, B.r. Cardoso, B. Merlin, D.c. Moreira
    Abstract:

    Abstract We investigate the causes of failure of a Piston Rod of a hydraulic cylinder, which moves a spillway floodgate of a hydroelectric power plant, after 30 years of service. The fractured Piston Rod is made of the AISI 410 martensitic stainless steel (condition T). The analysis shows that intergranular cracking originated on the outer surface and propagated along prior austenite grain boundaries, accompanied by corrosive attacks between martensite needles. The low performance of the Piston Rod can be explained by the improper heat treatment during the manufacturing process, which led to a high δ-ferrite content, temper embrittlement, low toughness, and susceptibility to stress corrosion cracking.

Yiyin Shan - One of the best experts on this subject based on the ideXlab platform.

  • microstructure characteristics of segregation zone in 17 4ph stainless steel Piston Rod
    Journal of Iron and Steel Research International, 2017
    Co-Authors: Jialong Tian, Wei Wang, Zhouhua Jiang, Yiyin Shan, Ke Yang
    Abstract:

    The segregation of Cu and Ni in a 17-4PH stainless steel Piston Rod has been confirmed to be responsible for the cracking after heat treatment. Further investigation showed that the segregation zone was composed of three layers, namely the fine grain martensitic layer, the coarse grain martensitic layer and the coarse grain austenitic layer from the matrix to the crack surface. Three button ingots with the same chemical compositions as those three layers have been prepared to evaluate the grain size distribution, microstructure and mechanical properties. The effects of Cu and Ni segregation on the microstructures of those three layers have been explored by thermodynamic calculation. Based on the microstructure and mechanical properties results, an intensive understanding of the cracking in the segregation zone was therefore reached.

  • cracking due to cu and ni segregation in a 17 4 ph stainless steel Piston Rod
    Engineering Failure Analysis, 2016
    Co-Authors: Jialong Tian, Wei Wang, Zhouhua Jiang, Yiyin Shan, Ke Yang
    Abstract:

    Abstract The 17-4 PH stainless steel is employed to pRoduce Piston Rods in industry due to the high strength and toughness, good workability and nice corrosion resistance. In the present failure analysis, obvious long cracks were observed along the longitudinal direction on the surface of the commercial 17-4 PH stainless steel Piston Rod after heat treatment. The cracks were carefully looked into by observing the crack tip and characterizing the microstructure along the cracks. The results showed that the cracks were mostly initiated from the surface of the Rod and propagated along the phase boundary between martensite and δ ferrite. The EDXA showed that the segregation of Cu and Ni should be responsible for the cracking after heat treatment. In order to define when the crack was coming into being, oxidation film along the crack was considered as a clue. The scrutiny of the oxidation film on the crack edge illustrated that the crack should be formed right in the heat treatment of aging.

Zhouhua Jiang - One of the best experts on this subject based on the ideXlab platform.

  • microstructure characteristics of segregation zone in 17 4ph stainless steel Piston Rod
    Journal of Iron and Steel Research International, 2017
    Co-Authors: Jialong Tian, Wei Wang, Zhouhua Jiang, Yiyin Shan, Ke Yang
    Abstract:

    The segregation of Cu and Ni in a 17-4PH stainless steel Piston Rod has been confirmed to be responsible for the cracking after heat treatment. Further investigation showed that the segregation zone was composed of three layers, namely the fine grain martensitic layer, the coarse grain martensitic layer and the coarse grain austenitic layer from the matrix to the crack surface. Three button ingots with the same chemical compositions as those three layers have been prepared to evaluate the grain size distribution, microstructure and mechanical properties. The effects of Cu and Ni segregation on the microstructures of those three layers have been explored by thermodynamic calculation. Based on the microstructure and mechanical properties results, an intensive understanding of the cracking in the segregation zone was therefore reached.

  • cracking due to cu and ni segregation in a 17 4 ph stainless steel Piston Rod
    Engineering Failure Analysis, 2016
    Co-Authors: Jialong Tian, Wei Wang, Zhouhua Jiang, Yiyin Shan, Ke Yang
    Abstract:

    Abstract The 17-4 PH stainless steel is employed to pRoduce Piston Rods in industry due to the high strength and toughness, good workability and nice corrosion resistance. In the present failure analysis, obvious long cracks were observed along the longitudinal direction on the surface of the commercial 17-4 PH stainless steel Piston Rod after heat treatment. The cracks were carefully looked into by observing the crack tip and characterizing the microstructure along the cracks. The results showed that the cracks were mostly initiated from the surface of the Rod and propagated along the phase boundary between martensite and δ ferrite. The EDXA showed that the segregation of Cu and Ni should be responsible for the cracking after heat treatment. In order to define when the crack was coming into being, oxidation film along the crack was considered as a clue. The scrutiny of the oxidation film on the crack edge illustrated that the crack should be formed right in the heat treatment of aging.