回火温度对9NiCrMo钢性能和组织的影响  

Effect of Tempering Temperature on Microstructures and Properties of 9NiCrMo Steel

作　　者：田景云[1] 洪波 沈俊昶[3] 

机构地区：[1]日照钢铁有限公司,山东日照276806 [2]唐钢中厚板材有限公司,河北唐山063610 [3]钢铁研究总院结构材料研究所,北京100081

出　　处：《钢铁钒钛》2013年第6期101-105,共5页Iron Steel Vanadium Titanium

摘　　要：通过对9NiCrMo钢在不同回火温度下常规力学性能的测试、扫描电镜、透射电镜观察和XRD分析,研究了回火温度对其力学性能和微观组织的影响。结果表明:该钢具有较高的强度和良好的低温韧性;随着回火温度的升高,屈服强度和抗拉强度分别在550℃附近和570℃附近出现高峰,峰时效状态细小的M2C型碳化物弥散析出起到了重要的强化作用。二次马氏体的析出也是导致强度增加的因素。其良好的低温韧性主要归因于极细小的二次马氏体板条束、铁素体、适量的逆转变奥氏体的出现。Through testing, SEM and TEM observation and XRD analysis for common mechanical proper- ties of 9NiCrMo steel under different tempering temperature, the effect of tempering temperature on me- chanical properties and microstructures of the steel was studied. The steel shows relatively high strength and good low - temperature toughness. As the tempering temperature increases, the yield strength and tensile strength peak near 550 ℃ and 570 ℃ respectively. Fine M=C carbides precipitated play an impor- tant role in strengthening. Secondary martensitic precipitation is also a factor that cause the increase in strength. Good low - temperature toughness can mainly be attributed to the appearance of very tiny sec- ondary martensite lath, ferrite, and appropriate amount of reverted austenite.

关 键 词：高强韧钢 9NiCrMo 回火温度 二次马氏体 逆转变奥氏体 M2C析出 

分 类 号：TG156.5[金属学及工艺—热处理]