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

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.

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

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.