Temperature and Strain-rate Effect to Mechanical Behavior of Mo-Cr Alloy Cast Iron
Mo-Cr alloy cast iron is the most important material often used to make auto panel dies. To study high-speed machining process of auto panel dies, the materials elastic modulus and fracture critical values of Mo-Cr alloy iron at 20 ℃-800 ℃ were studied based on the high temperature elongation test. The materials stress-strain relation curves at various temperatures(20 ℃-500 ℃) and various strain-rates (500/s-5000/s) were studied and the dynamic tensile yield strength values were obtained by dynamic SHPB(Split Hopkinson Pressure Bar) high-speed compression test. The test observation showed that Mo-Cr alloy iron has heat resistance and its behavior is between toughness and brittleness materials. Its toughness is enhanced with temperature increasing. At 20 ℃-500 ℃ and strain-rates (500/s-5000/s) the dynamic tensile yield strength is decreased about 17 ％-24 ％by temperature softening effect and is increased about 56 ％-70 ％by strain-rate strengthening effect. The strain-rate strengthening effect prevails over temperature softening effect.
Ruan Jingkui Hu Mingmao
Department of Mechanical Engineering, Hubei University of Automotive Technology, Shiyan,Hubei, 44200 Department of Mechanical Engineering, Hubei University of Automotive Technology, Shiyan, Hubei, 4420
国际会议
桂林
英文
1-6
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）