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by microstructure has a significant effect on the forming load and material flow during hot forming. Many DRX models and flow stress models of C-Mn steels and low carbon microalloyed steels have been developed... and flow stress model of F40MnV steel WANG Jin(王 进), CHEN Jun(陈 军), ZHAO Zhen(赵 震), RUAN Xue-yu(阮雪榆) (National Die and Mold CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai......
; (3) where a and b are material constants. The relationship among flow stress, strain rate and temperature of metal during hot deformation can be usually expressed as follows[15]: For low... to determine material constants in flow stress model. Taking the logarithm of both sides of Eqs.(4) and (5), respectively, the mean value of n1 can be calculated as 6.04 at low stress level (for temperature......
and medium flow speed) when the complex hole is polished[7-9]. Moreover, the medium viscosity and extrusion pressure will significantly affect the material removal and the surface roughness of AFM[8... should be found. Bouncing putty, supplied by Charlie-kao Toy Company[24], was used as the matrix of the abrasive medium in this research. This material is a kind of silicone gel with low flow......
Dissymmetric flow phenomenon in a multistrand tundishMingmei Zhu, Guanghua Wen, Ping Tang, and Yufeng Wang College of Material Science and Engineering, Chongqing University, Chongqing 400044, China摘 要:The dissymmetric flow phenomenon exists in a symmetric multistrand tundish. It was studied by the physical simulation experiment. The fundamental flow......
Discussion and prediction on decreasing flow stress scale effect SHEN Yu(申 昱), YU Hu-ping(于沪平), RUAN Xue-yu(阮雪榆) National Die and Mold CAD Engineering Research Center, Shanghai Jiaotong... theory and surface layer model, relation of flow stress to billet dimension and grain size was built, and rationality of derived relation was verified with tensile tests of different size billets......
Material flow behavior and microstructural evolution during refill friction stir spot welding of alclad 2A12-T4 aluminum alloyGao-hui Li1,Li Zhou1,2,Ling-yun Luo2,Xi-ming Wu2,Ning Guo21. State Key...="ChDivSummary" name="ChDivSummary">In this study, we used the stop-action technique to experimentally investigate the material flow and microstructural evolution of alclad 2A12-T4 aluminum alloy during refill......
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Simulations of Viscous Flow Fields of ASTM Assembly and the Effective Average Velocities of Flow Tubes Yuan Jian1,WANG Ming-hua1,LI Lin-lin1,CHEN Nai-lu1,ZHANG Wei-min1,LIU Yang1 (1.School of Material Sci & Eng , Shanghai Jiao Tong University, Shanghai, 200030, China) 摘要:With the finite element analysis of viscous quenchant flow fields of the ASTM assembly, the effective average velocities......
SIMULATION OF 3-D DEFORMATION AND MATERIAL FLOW DURING ROLL FORGING PROCESS USING SYSTEM OF OVAL-ROUND GROOVE G.H. Liu1,G.S. Ren1,C.G. Xu1 (1.Beijing Research Institute of Mechanical & Electrical..., rolling, and separating stages. The analysis was conducted using the Deform-3D ver. 5.0 code.The important information concerned with the deformation area characteristic, material fiow, and velocity field......
flow law of drawn part can be known through the analysis of equivalent plastic strain nephogram. Fig.2 shows the influences of material parameters on the equivalent plastic strain (identified... Influences of material parameters on deep drawing of thin-walled hemispheric surface part GAO En-zhi(高恩志), LI Hong-wei(李宏伟), KOU Hong-chao(寇宏超), CHANG Hui(常 辉), LI Jin-shan(李金山......