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利用金相显微镜(OM)、扫描电镜(SEM)、高分辨透射电镜(HRTEM)与性能测试等试验手段,研究了调整处理对AM355高强不锈钢微观组织与力学性能的影响。结果表明,随着调整处理的温度升高,一方面钢中残留奥氏体含量逐渐升高,从而引起钢的屈服强度逐渐降低;另一方面,钢中的第二相粒子随着调整温度的升高产生了回溶现象,其固溶强化效果导致钢的抗拉强度逐渐提高,两方面的综合效果使得AM355钢的屈强比随着调整温度的升高而逐渐降低。此外,在750~1000℃温度范围进行调整处理后,钢中出现了M23C6、(Cr,Mo)2N、α-(Cr,Fe)析出相,其中(Cr,Mo)2N颗粒尺寸最小而α-(Cr,Fe)颗粒尺寸最大。
The effect of adjusting treatment on the microstructure and mechanical properties of AM355 high strength stainless steel was studied by OM, SEM, HRTEM and performance test. The results show that with the increase of temperature, the content of retained austenite in steel gradually increases, and the yield strength of steel decreases gradually. On the other hand, the second phase of the steel increases with the temperature The solution has the effect of solid solution strengthening. The tensile strength of steel increases gradually. The combined effect of both factors makes the yield ratio of AM355 steel gradually decrease with the increase of temperature. In addition, M23C6, (Cr, Mo) 2N, α- (Cr, Fe) precipitates appeared in the steel after adjusting at the temperature range of 750 ~ 1000 ℃, and the particle size of (Cr, Mo) (Cr, Fe) the largest particle size.