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本文研究了高温和低温回火状态下35CrNi 3MoV钢马氏体一贝氏体复合组织中贝氏体类型(包括下贝、上贝和粒贝)及贝氏体体积分数与其拉伸、系列冲击,室温与低温断裂韧性之间的关系。结果表明:高温回火状态下马氏体一贝氏体复合组织强度高于混合定则;高温回火状态下马氏体一贝氏体复合组织中上、下贝氏体体积分数达约50%,-196～25℃的CVN和-75～15℃的k_(IC)都与马氏体接近,但全上,下贝氏体韧脆转折温度大为升高。通过光学全相透射和扫描电镜分析,探讨了显微组织与性能间的关系。
In this paper, the bainite type (including lower shell, shellfish and shellfish) and bainite volume fraction in the 35CrNi 3MoV steel tempered at 35 ℃ and 3% , The relationship between room temperature and low temperature fracture toughness. The results show that the strength of the martensite-bainite composite is higher than that of the mixed one under high-temperature tempering; the volume fraction of upper and lower bainite in the martensite-bainite composite is about 50% CVN between -196 ℃ and 25 ℃ and k IC between -75 ℃ and 15 ℃ are close to that of martensite, but the transition temperature of ductile-brittle-ductile-brittle-ductile brittleness increases greatly. By optical phase transmission and scanning electron microscopy analysis of the relationship between the microstructure and properties.