热处理对40CrMnSiB低合金超高强度钢组织和性能的影响

Effect of Heat Treatment on Microstructure and Properties of 40CrMnSiB Low Alloy Ultra-High Strength Steel

采用OM、SEM、JMatPro7.0分析技术,研究了热处理工艺(860~950℃淬火+200~400℃回火)对新型中碳40CrMnSiB低合金超高强度钢(0.41C,0.84Cr,0.76Mn,1.44Si,0.006B)微观组织及力学性能的影响。结果表明:920℃淬火和300℃回火钢的力学性能达到最佳强韧性匹配,即抗拉强度为1 943 MPa、屈服强度为1 931 MPa、延伸率为9%、断面收缩率为39.5%、冲击吸收功为44J、HRC硬度值为52.7。

The effects of heat treatment(quenched at 860~950 ℃+tempered at 200~400 ℃) on the microstructure and mechanical properties of a new medium carbon 40CrMnSiB low alloy ultra-high strength steel(0.41C,0.84Cr,0.76Mn,1.44Si,0.006B) are investigated by OM,SEM and JMatPro7.0 analysis techniques.The results show that with quenched at 920℃ and tempered at 300℃,the mechanical properties of the steel reach the best toughness matching,that is,the tensile strength 1 943 MPa,the yield strength 1 931 MPa,the elongation 9%,and the reduction of area 39.5%,the impact absorption work 44 J,and the HRC hardness value 52.7.