摘要
研究了CoCrMo合金普通壳型铸造工艺下过热度和高温固溶热处理对显微组织的影响。结果表明:CoCrMo合金在铸态下碳化物主要以大块状共晶状M23C6碳化物存在;随着过热度的增加,碳化物共晶团的尺寸增大,导致室温拉伸性能降低。CoCrMo合金经过高温固溶热处理后,大部分大块状共晶碳化物发生溶解和分解,以细小的颗粒状M23C6碳化物析出并均匀分布于基体,抗拉强度、屈服强度和伸长率得到很大的提高。均匀细小分布的碳化物有利于提高CoCrMo合金的室温拉伸性能。
The effects of different superheat temperature and solution treatment on microstructure of shell mould casting CoCrMo alloy were studied.The results show that the carbides of as cast CoCrMo alloy exist in the form of eutectic M23C6.As the superheat temperature being enhanced,the size of carbides eutectic cells increases and tensile properties decline at room temperature.After solution treatment,most of primary blocky carbides are dissolved and small dimension M23C6carbides are precipitated,uniformly distributing in the matrix.Tensile strength and yield strength and elongation are improved.Small dimension and uniformly distributed M23C6carbides are to the benefit of improving the tensile properties at room temperature of CoCrMo alloy.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2014年第3期66-70,共5页
Journal of Materials Engineering
关键词
过热度
固溶热处理
显微组织
碳化物
拉伸性能
superheat temperature
solution treatment
microstructure
carbide
tensile property
