The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

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

  • An experiment study on the Castex process for AS wire
    Journal of Materials Processing Technology, 2001
    Co-Authors: Shi Zhiyuan, Wen Jinglin, Wang Xinhua
    Abstract:

    Systemic experiments have been done with the Castex machine for different process parameters. This paper mainly studied the affect on the process of casting Temperature, Preheat Temperature of steel wire, rotating speed of the wheel, flow of cooling water, extrusion speed of the steel wire, extrusion ratio and the gap between the surface of wheel and that of the mould. Among all of these parameters the casting Temperature has the most effect. © 2001 Elsevier Science B.V.

Niyanth Sridharan - One of the best experts on this subject based on the ideXlab platform.

  • effect of Preheat Temperature and post process treatment on the microstructure and mechanical properties of stainless steel 410 made via ultrasonic additive manufacturing
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2020
    Co-Authors: Niyanth Sridharan, Leon M Headings, S S Babu, Marcelo J Dapino
    Abstract:

    Abstract Ultrasonic additive manufacturing (UAM) is a solid-state manufacturing technology for producing near-net shape metallic parts combining additive ultrasonic metal welding and subtractive machining. Even though UAM has been demonstrated to produce robust metal builds in Al–Al, Al–Ti, Al-steel, Cu–Cu, Al–Cu, and other material systems, UAM welding of high strength steels has proven challenging. This study investigates process and post-processing methods to improve UAM steel weld quality and demonstrates the UAM fabrication of stainless steel 410 (SS 410) builds which possess, after post-processing, mechanical properties comparable with bulk material. Unlike UAM fabrication of softer metals, this study shows that increasing the baseplate Temperature from 38∘C (100∘F) to 204∘C (400∘F) improves interfacial strength and structural homogeneity of the UAM steel samples. Further improvement in strength is achieved through post-processing. The hot isostatic pressing (HIP) post treatment improves the shear strength of UAM samples to 344 MPa from 154 MPa for as-welded samples. Microstructural analyses with SEM and EBSD show no evidence of body centered cubic (BCC) ferrite to face centered cubic (FCC) austenite transformation taking place during UAM welding of SS 410. The weld quality improvement of UAM steel at higher baseplate Temperatures is believed to be caused by the reduction of the yield strength of SS 410 at elevated Temperature. HIP treatment is shown to increase the overall hardness of UAM SS 410 from 204 ± 7 HV to 240 ± 16 HV due to the formation of local pockets of martensite. Nanohardness tests show that the top of layer n is harder than the bottom of layer n+1 due to grain boundary strengthening.

Shi Zhiyuan - One of the best experts on this subject based on the ideXlab platform.

  • An experiment study on the Castex process for AS wire
    Journal of Materials Processing Technology, 2001
    Co-Authors: Shi Zhiyuan, Wen Jinglin, Wang Xinhua
    Abstract:

    Systemic experiments have been done with the Castex machine for different process parameters. This paper mainly studied the affect on the process of casting Temperature, Preheat Temperature of steel wire, rotating speed of the wheel, flow of cooling water, extrusion speed of the steel wire, extrusion ratio and the gap between the surface of wheel and that of the mould. Among all of these parameters the casting Temperature has the most effect. © 2001 Elsevier Science B.V.

Marcelo J Dapino - One of the best experts on this subject based on the ideXlab platform.

  • effect of Preheat Temperature and post process treatment on the microstructure and mechanical properties of stainless steel 410 made via ultrasonic additive manufacturing
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2020
    Co-Authors: Niyanth Sridharan, Leon M Headings, S S Babu, Marcelo J Dapino
    Abstract:

    Abstract Ultrasonic additive manufacturing (UAM) is a solid-state manufacturing technology for producing near-net shape metallic parts combining additive ultrasonic metal welding and subtractive machining. Even though UAM has been demonstrated to produce robust metal builds in Al–Al, Al–Ti, Al-steel, Cu–Cu, Al–Cu, and other material systems, UAM welding of high strength steels has proven challenging. This study investigates process and post-processing methods to improve UAM steel weld quality and demonstrates the UAM fabrication of stainless steel 410 (SS 410) builds which possess, after post-processing, mechanical properties comparable with bulk material. Unlike UAM fabrication of softer metals, this study shows that increasing the baseplate Temperature from 38∘C (100∘F) to 204∘C (400∘F) improves interfacial strength and structural homogeneity of the UAM steel samples. Further improvement in strength is achieved through post-processing. The hot isostatic pressing (HIP) post treatment improves the shear strength of UAM samples to 344 MPa from 154 MPa for as-welded samples. Microstructural analyses with SEM and EBSD show no evidence of body centered cubic (BCC) ferrite to face centered cubic (FCC) austenite transformation taking place during UAM welding of SS 410. The weld quality improvement of UAM steel at higher baseplate Temperatures is believed to be caused by the reduction of the yield strength of SS 410 at elevated Temperature. HIP treatment is shown to increase the overall hardness of UAM SS 410 from 204 ± 7 HV to 240 ± 16 HV due to the formation of local pockets of martensite. Nanohardness tests show that the top of layer n is harder than the bottom of layer n+1 due to grain boundary strengthening.

Y S Tarng - One of the best experts on this subject based on the ideXlab platform.

  • the use of fuzzy logic in the taguchi method for the optimisation of the submerged arc welding process
    The International Journal of Advanced Manufacturing Technology, 2000
    Co-Authors: Y S Tarng, W. H. Yang, S C Juang
    Abstract:

    The use of fuzzy logic in the Taguchi method to optimise the submerged arc welding process with multiple performance characteristics is reported in this paper. An orthogonal array, the signal-to-noise ratio, multiresponse performance index, and analysis of variance are employed to study the performance characteristics in the submerged arc welding process. The process parameters, namely arc current, arc voltage, welding speed, electrode protrusion, and Preheat Temperature are optimised with considerations of the performance characteristics, including deposition rate and dilution. Experimental results are provided to confirm the effectiveness of this approach.

  • Optimisation of submerged arc welding process parameters in hardfacing
    The International Journal of Advanced Manufacturing Technology, 1996
    Co-Authors: H. L. Tsai, Y S Tarng, C. M. Tseng
    Abstract:

    In this paper, a feedforward neural network is used to model submerged arc welding (SAW) processes in hardfacing. The relationships between process parameters (arc current, arc voltage, welding speed, electrode protrusion, and Preheat Temperature) and welding performance (deposition rate, hardness, and dilution) are established, based on the neural network. A simulated annealing (SA) optimisation algorithm with a performance index is then applied to the neural network for searching the optimal process parameters. Experimental results have shown that welding performance can be enhanced by using this new approach.