摘要
采用显微镜、硬度计、拉伸试验机以及光谱分析仪等研究了在蠕化处理后浇注前铁液停留不同时间对蠕墨铸铁显微组织、化学成分和力学性能的影响。结果表明:随停留时间延长,石墨球化率和珠光体含量都有一定程度增加,但停留时间在15 min以内浇注则蠕墨铸铁中蠕虫状石墨均在70%以上,基体中珠光体含量均在60%以上,抗拉强度在350 MPa以上,硬度在220 HBS以上,其蠕化衰退不十分明显;蠕墨铸铁的力学性能和显微组织最终取决于残留稀土、镁含量之和与硫含量的比值。
The influence of molten iron holding time before pouring and alter creep treatment on microstructure, chemical composition and mechanical properties of vermicular cast iron was studied by microscopy, sclerometer, pull test machine and optical spectrum analyzer. The results show that the percent of graphite spheroidization and the pearlite content increased at a certain degree with the extending holding time. If the holding time after creep was less than 15 min, the vermicular graphite in vermicular cast iron exceeded 70% , the pearlite content in matrix was more than 60%, the tensile strength and the hardness surpassed 350 MPa and 220 HBS respectively, the creep recession was not specially obvious. The mechanical properties and, microstructure of the vermicular cast iron finally depended on the ratio of the sum of residual rear earth and magnesium to sulfur content.
出处
《机械工程材料》
CAS
CSCD
北大核心
2011年第4期17-19,24,共4页
Materials For Mechanical Engineering
关键词
蠕墨铸铁
蠕化衰退
力学性能
显微组织
vermicular cast iron
creep recession
mechanical property
microstrueture
