回火温度对10Ni5CrMoV钢焊缝组织及性能影响  

Effects of Tempering Temperature on Microstructure and Mechanical Properties of 10Ni5CrMoV Steel Welding Seam

作　　者：郑钢[1] 

机构地区：[1]重庆科创职业学院信息与机电工程学院,重庆402160

出　　处：《热加工工艺》2017年第11期201-203,共3页Hot Working Technology

摘　　要：对10Ni5Cr Mo V钢焊接接头进行了不同焊后回火处理,对比分析了不同回火温度对焊缝组织、硬度以及韧性的影响规律。结果表明:焊后空冷条件下,焊缝组织中存在大量的片状马氏体,韧性较差;冲击断口中出现大面积较平区域,同时基体侧与焊缝侧之间的硬度梯度较大。随着回火温度的升高,焊缝组织中的片状马氏体逐渐减少,板条状回火马氏体逐渐增多,基体侧与焊缝侧之间的硬度梯度逐渐减小,同时断口中的大面积较平区域逐渐减少,韧窝逐渐增多,焊缝的韧性逐渐提高。回火温度为600℃时,焊缝组织主要表现为细小的粒状回火索氏体,基体侧与焊缝侧之间的硬度梯度ΔH降低至150HV,同时断口中出现大量较小较深的断裂韧窝,韧性最好。The 10Ni5CrMoV steel welded joints were heat treated with different post weld tempering, and the effects of different tempering temperature on the microstructure and mechanical properties of welding seam were compared and analyzed. The results show that there is large amounts of lamellar martensite in air cooling state,and the toughness is low. There is a large flat area in impact fracture morphology and the hardness gradient between the substrate and weld is big. With the increase of tempering temperature, the lamellar martensite reduces, the plate strip tempered martensite increases, and the hardness gradient between the substrate and weld decreases gradually, while the large fiat area in impact fracture morphology reduces, the dimple increases gradually, and the toughness of welding seam improves gradually. When the temperature is 600 ℃, the microstructure of welding seam is small granular tempered sorbite, the hardness gradient （AH） between the substrate and weld reduces to 150HV, it appears a large number of small deep fracture dimple and the toughness is the best.

关 键 词：10NI5CRMOV钢 回火温度 力学性能 

分 类 号：TG142[一般工业技术—材料科学与工程] TG441.8[金属学及工艺—金属材料]