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.
参考文献
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| [6] | 罗志昌,姚钦,田燕,张伟民,郎毅,侯丽．焊接学报,1990 |
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