摘要
使用激光共聚焦显微镜、扫描电镜和示波冲击等实验手段研究了镍元素(0.0%～0.9%,质量分数,下同)对球墨铸铁的微观组织和低温冲击性能的影响,对低温断裂机理进行了探讨。结果表明:含镍0.7%退火态球墨铸铁的韧脆转变温度低于-60℃,其-70℃下冲击功高于12J;适量镍元素添加能有效地细化晶粒和强化基体,改善球墨铸铁的低温冲击性能。
Utilizing laser confocal microscopy, methods, the influence of nickel content（0.0% SEM, instrumented impact and other experimental 0.9% ,mass fraction, the same below） on the microstructure and low temperature impact toughness of ductile cast iron（DCI） was investigated. The fracture mechanism of DCIs was studied further at different temperatures by using scanning electronic microscopy （SEM）. The results show that ductile-to-brittle transition temperature of as-annealed DCIs with 0.7% Ni content is lower than -60℃, the impact energy of Charpy-type test is still higher than 12J at -70℃. Minor Ni addition of proper quantities might favor the grain refinement and matrix strengthen, low temperature impact toughness properties of DCIs are markedly improved.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2012年第12期33-38,共6页
Journal of Materials Engineering
基金
国家科技支撑计划资助项目(2009BAG12A07)
2010年度中央高校基本科研业务费专项资金资助项目(SWJTU09ZT22)
中央高校基本科研业务费专项资金资助(SWJTU12CX011)
关键词
球墨铸铁
低温冲击性能
韧脆转变
ductile cast iron
low temperature impact toughness
ductile-to-brittle transition
