摘要
以蠕墨铸铁为对象,研究了等温淬火工艺对材料室温力学性能、高温力学性能、热稳定性及冷热疲劳性的影响。结果表明:较佳的等温淬火工艺为:(850～880℃)×1.5 h+290℃×1.5h;等温淬火蠕铁常温至300℃,抗拉强度提高1倍以上,600℃时材料抗拉强度下降较多;等温淬火蠕铁在300～400℃温度下的金相组织与保温时间基本无关,等温淬火蠕铁的冷热疲劳性能优于普通蠕铁。
Taking vermicular graphite cast iron as the research object, the effects of austempering process on room temperature mechanical properties, high temperature mechanical properties, thermal stability and thermal fatigue properties of vermicular graphite cast iron were studied. The results show that the optimum austempering process is:(850-880 ℃)×1.5 h+290 ℃×1.5 h;the tensile strength of austempering vermicular graphite cast iron increases by more than one fold from room temperature to 300 ℃ and decreases more at600 ℃;the metallographic structure of austempering vermicular graphite cast iron at 300-400 ℃ is basically independent of holding time, and the thermal fatigue property of austempering vermicular graphite cast iron is better than that of ordinary one.
作者
喻光远
肖恭林
徐小辉
钱坤才
YU Guang-yuan;XIAO Gong-lin;XU Xiao-hui;Qian Kun-cai(CRRC Qishuyan Institute Co., Ltd., Changzhou 213011, Jiangsu, China)
出处
《铸造》
CAS
北大核心
2019年第5期435-442,共8页
Foundry
关键词
等温淬火蠕墨铸铁
高温性能
热稳定性
冷热疲劳
austempering vermicular graphite cast iron
high-temperature properties
thermal stability
thermal fatigue
