The formation of strain-induced martensite (SIM) is found in metastable austenitic stainless steel (m-ASS) during cold forming, and the presence of SIM may cause reductions in toughness, ductility, and corrosion resistance of m-ASS. These mechanical properties can be restored and improved by proper heat treatment after forming, however, which obviously raises the manufacturing costs. One low-cost way to reduce the SIM amount during m-ASS forming is to maintain the forming temperature at an appropriate level. This paper intends to investigate an approach to determine the optimum forming temperature at which the strain-induced martensitic transformation (SIM-Tr) of m-ASS head during forming can be restrained within a limited intensity. First, static tensile tests were conducted on S30408 conventional cylindrical tensile specimens under different temperatures varying from 20 °C to 180 °C, and then the effect of deformation temperature on SIM was evaluated. Second, according to the stacking fault energy (SFE) calculation method, m-ASS's chemical composition was taken into further consideration to investigate its effect on SIM. Finally, a formula was established based on SIM and chemical composition for optimization of forming temperature. In addition, the results obtained by this formula were compared with those of the experiment by S30408 ASS head stamping tests, and the satisfactory matching is found for the proposed forming temperatures and predicted ferrite number (FN) values (readings of the Ferritescope measurement, as a representation of the amount of martensite in this study). Furthermore, an enhancement in the cryogenic impact properties and a fewer quantity of delta-ferrite in the microstructure of m-ASS heads are observed when warm stamping is performed as compared with the cold stamped head.
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October 2019
Research-Article
Research on Forming Temperature of Metastable Austenitic Stainless Steel Head Based on Strain-Induced Martensitic Transformation
Jinyang Zheng,
Jinyang Zheng
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China;
State Key Laboratory of Fluid Power and
Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China;
Engineering Research Center for High Pressure
Process Equipment and Safety,
Ministry of Education,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China;
State Key Laboratory of Fluid Power and
Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China;
Engineering Research Center for High Pressure
Process Equipment and Safety,
Ministry of Education,
Zhejiang University,
Hangzhou 310027, China
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Qunjie Lu,
Qunjie Lu
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
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Xiao Zhang,
Xiao Zhang
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
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Huiming Ding,
Huiming Ding
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
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Peizi Hui,
Peizi Hui
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
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Qingqing Li
Qingqing Li
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
Search for other works by this author on:
Jinyang Zheng
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China;
State Key Laboratory of Fluid Power and
Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China;
Engineering Research Center for High Pressure
Process Equipment and Safety,
Ministry of Education,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China;
State Key Laboratory of Fluid Power and
Mechatronic Systems,
Zhejiang University,
Hangzhou 310027, China;
Engineering Research Center for High Pressure
Process Equipment and Safety,
Ministry of Education,
Zhejiang University,
Hangzhou 310027, China
Qunjie Lu
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
Yingzhe Wu
Xiao Zhang
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
Huiming Ding
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
Peizi Hui
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
Qingqing Li
Institute of Process Equipment,
Zhejiang University,
Hangzhou 310027, China
Zhejiang University,
Hangzhou 310027, China
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 19, 2017; final manuscript received June 6, 2019; published online July 17, 2019. Assoc. Editor: San Iyer.
J. Pressure Vessel Technol. Oct 2019, 141(5): 051401 (8 pages)
Published Online: July 17, 2019
Article history
Received:
January 19, 2017
Revised:
June 6, 2019
Citation
Zheng, J., Lu, Q., Wu, Y., Zhang, X., Ding, H., Hui, P., and Li, Q. (July 17, 2019). "Research on Forming Temperature of Metastable Austenitic Stainless Steel Head Based on Strain-Induced Martensitic Transformation." ASME. J. Pressure Vessel Technol. October 2019; 141(5): 051401. https://doi.org/10.1115/1.4043995
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