标准热处理状态下高强耐蚀C-22HS合金的显微组织和力学性能  

Microstucture and mechanical properties of a corrosion-resistant alloy C-22HS with high strength under standard heat treatment condition

作　　者：寇立忠[1] 曾燕屏[1] 谢锡善[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2008年第1期40-44,共5页Journal of University of Science and Technology Beijing

摘　　要：采用热力学计算、SEM与TEM观察、力学性能测试等手段研究了一种新型高强耐蚀合金C-22HS在标准热处理状态下的显微组织及力学性能.结果表明:标准热处理状态下C-22HS合金由大小不均匀的等轴晶组成,合金中析出相主要有聚集分布的颗粒相(Mo,Cr)6C和弥散分布的强化相Ni2(Mo,Cr).合金经标准热处理后不仅具有较高的强度,而且具有良好的塑性与冲击韧性;无论是在室温还是高温,它的屈服强度都大大高于C-22合金.The microstructure and mechanical properties of a new corrosion-resistant alloy C-22HS with high strength under standard heat treatment condition were studied by means of thermodynamic calculations, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and mechanical properties testing. The results indicate that C-22HS alloy under standard heat treatment condition is composed of equiaxed grains with different sizes. Major precipitations in C-22HS alloy are granular （Mo, Cr）6C and dispersed distributing strengthening phase Ni2（Mo, Cr）. It is shown that C-22HS alloy under standard heat treatment condition possesses not only a higher strength but also a better plasticity and impact toughness. Its yield strength is much higher than that of C-22 alloy at room temperature or high temperature.

关 键 词：镍基合金 显微组织 力学性能 析出相 

分 类 号：TG146.15[一般工业技术—材料科学与工程]