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Investigation of sus304 stainless steel with Warm Hydro-mechanical Deep Drawing

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Journal of Materials Science & Technology 2004年第1期20卷 92-93页

作者： Yongchao XU, Dachang KANG and Shihong ZHANGSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaShihong ZHANGInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Sch. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

Basing on warm mechanical property of sus304 stainless steel and hydro-mechanical deep drawing process, warm hydro-mechanical deep drawing process is proposed and discussed with experiments in this paper. The experiments are performed at four different temperatures. The results show that the formability of stainless steel is improved under the condition of warm temperature. Warm hydro-mechanical deep drawing raises limiting drawing ratio of sus304 effectively, and limiting drawing ratio 3.3 is obtained, which is beyond 2.0 with conventional deep drawing. The temperature of 90℃ is beneficial to the forming of sus304 stainless steel, the strain-induced martensite is controlled effectively, and the thickness distribution is more uniform.

关键词： sus304 stainless steel Warm hydro-mechanical deep drawing Forming Cylindrical cup

Investigation on the Hydro-forming of sus304 stainless steel Dome

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Chinese Journal of Aeronautics 2006年第B12期19卷 261-264页

作者： XU Yong-chao YUAN Shi-jian CHEN Yu ZHOU Li-xin KANG Da-chang School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The dome hydro-forming was studied theoretically and experimentally. The theoretical analysis shows that the process of dome hydro-forming can be divided into two stages, i.e., firstly forming a hemi-sphere and secondly forming a hemi-toroidal. Theoretically, being larger than those in the outer area of a hemi-toroidal shell, the radial tensile stresses take place in the inner area where fracture is more likely to occur in the forming process. The required hydraulic pressure to form the dome should be determined by the deformation in the outer area, hitting about 12 MPa in theory. The experimental results show that the dome could be produced in one operation by hydro-forming which needs a hydraulic pressure of about 9 MPa. The experimental results prove to agree well with the theoretical analysis. In order to avoid wrinkling and fracture, the closing force acted on the die should be adjusted properly in accordance with the hvdraulic nressure.

关键词： hydro-forming dome sus304 stainless steel

Residual stress in the cylindrical drawing cup of sus304 stainless steel evaluated by split-ring test

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Residual stress in the cylindrical drawing cup of SUS304 sta...

Influence of Pre-Transformed Martensite on Work-Hardening Behavior of sus 304 Metastable Austenitic stainless steel

第十三届全国物理力学学术会议

作者： L.H.Xiao J.Z.Xiang D.H.Yuan J.G.Liu Y.C.Zhou School of Mechanical Engineering Xiangtan University Key Laboratory of Low Dimensional Materials & Application Technology ( Xiangtan University) Ministry of Education

The residual stresses in the wall of sus304 stainless steel cylindrical drawing cup were evaluated by split-ring tests,and the influences of the stamping die parameters on the residual stress were investigated.A new theoretical model of split-ring test was developed to evaluate the residual stress in ring,which was verified to be reasonable and reliable by numerical simulations with ABAQUS *** groups split-ring tests were completed,and the residual stresses were calculated according to the theoretical *** split-ring test results showed that the circumferential residual stress in the wall of sus304 stainless steel cylindrical drawing cup was very large,and did not change with the different die corner *** circumferential residual stress first increased with the increase of drawing punch-die clearance,then almost remained unchanged when the clearance increased greater than blank thickness *** a smaller clearance was suggested to be chosen to reduce the residual stress in the wall of sus304 stainless steel drawing cup.

关键词： residual stress split-ring test FEM numerical simulation sus304 stainless steel cylindrical drawing cup

来源： cnki会议评论

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Journal of Iron and steel Research International 2010年第3期17卷 51-55页

作者： XUE Zong-yu ZHOU Sheng WEI Xi-cheng School of Materials Science and Engineering Shanghai University Shanghai 200072 China

The metastable austenite was transformed to martensite by prestrain tension of sus304 stainless steel to study the influence of transformed martensite on its subsequent work-hardening behavior under the uniaxial tensile condition. The X-ray diffractometer （XRD） was employed to detect the transformed martensite. Results showed that the volume fraction of transformed martensite increases with increasing prestrain. The pre-transformed martensite in the microstructure remarkably affects the deformation behavior of the steel, and the strength increases and the elongation decreases. The work-hardening curve of prestrained specimens observably changes with true strain. The work-hardening exponent n of stainless steel decreases with the increase of pre-transformed martensite. The achievement is a significant contribution to the process design during pressing.

关键词： prestrain sus304 stainless steel martensite work-hardening behavior