铸造2024，Vol.73Issue(9)：1248-1253,6.
SiMoV蠕墨铸铁高温变形行为研究
Research on the Elevated Deform Behavior of SiMoV Vermicular Graphite Cast Iron
董鹏 1肖恭林 1杨志刚 1徐小辉 1陈坤1
作者信息
- 1. 常州朗锐铸造有限公司 江苏省轨道交通关键零部件工程技术中心,江苏常州 213164||中车戚墅堰机车车辆工艺研究所有限公司,江苏常州 213011
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摘要
Abstract
The elevated deformation behavior of SiMoV vermicular graphite cast iron in the temperature range of 500℃to 800℃was studied through experimental methods of optical microscopy,scanning electron microscopy,and high-temperature mechanical properties testing.The results indicate that the strain range in the yield stage of the stress-strain curve does not show significant growth or change,while the length of the strain interval from the necking stage to the fracture process significantly increases,with the increasing of the temperature,leading to softening of the material.Meanwhile,the tensile strength and yield strength sharply decrease with increasing temperature,with a decrease of 740%and 935%in yield strength and tensile strength at 800℃compared to 500℃.However,the extension shows the opposite trend,increasing by 479%.The origin of the crack is the tip of vermicular graphite,and the decrease of high-temperature strength is not only affected by the microstructure characteristics of the ferrite matrix,but also related to the oxidation of vermicular graphite at high temperature,leading to forming of secondary crack propagation.关键词
SiMoV蠕墨铸铁/应力应变曲线/高温力学性能/裂纹扩展Key words
SiMoV vermicular graphite cast iron/stress-strain curve/high temperature mechanical properties/crack propagation分类
矿业与冶金引用本文复制引用
董鹏,肖恭林,杨志刚,徐小辉,陈坤..SiMoV蠕墨铸铁高温变形行为研究[J].铸造,2024,73(9):1248-1253,6.
