焊接热循环对HQ130钢热影响区组织及性能的影响  

EFFECTS OF THE WELD THERMAL CYCLE ON MICROSTRUCTURE AND PROPERTIES OF THE HEAT-AFFECTED ZONE OF HQ130 STEEL

作　　者：李亚江[1] 邹增大[1] 陈祝年[1] 魏星[1] 江全昌[1] 

机构地区：[1]山东工业大学,厦门工程机械股份有限公司

出　　处：《金属学报》1996年第5期532-537,共6页Acta Metallurgica Sinica

摘　　要：采用模拟焊接热循环的方法，研究了不同峰值温度（Ｔｍ）和８００℃冷却至５００℃时间（ｔ）对ＨＱ１３０钢热影响区（ＨＡＺ）显微组织、硬度、冲击韧性和断口形态的影响。试验结果表明，单次热循环时随着ＨＡＺ中Ｔｍ的降低或ｔ的增加，冲击韧性和硬度相应地降低。在Ｔｍ＝８００℃附近的ＨＡＺ区域出现脆性区，韧性明显较低；Ｔｍ＝７００℃附近出现回火软化区，韧性较高，但硬度明显下降。在焊接生产中应采用多层多道焊并应严格限制焊接热量输入（ｔ应以２０ｓ为下限），以防止或减弱ＨＡＺ软化和脆化现象。The effects of the different peak temperatures(T_m) and cooling times(t) on the microstructure, hardness, impact toughness and fracture morphology of heat-affected zone(HAZ) of HQ130 steel were investigated by means of the weld thermo-simulation test.Experimental results indieated that the impact toughness and hardness were decreased with the decrease in T_m or increase in cooling time under the condition of single thermal cycle. There was brittle zone in the vicinity of T_m = 800℃ . where the impact toughness was obviously lower, and softened zone in 700℃, where the hardness obviously decreased but toughness increased. In practicalwelding, the multi-layer and multi-pass welding, in which the welding heat input was strictly limited (t≤20 s), should be applied to reduce softness and brittleness in HAZ of HQ130 steel.

关 键 词：高强度钢 焊接热循环 热影响区 显微组织 冲击韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG406[金属学及工艺—金属材料]