HQ130高强钢热影响区组织及韧性  

Microstructure and Toughness in HAZ of HQ130 Steel

作　　者：李亚江[1,2] 邹增大[1,2] 陈祝年 尹士科[1,2] 

机构地区：[1]济南山东工业大学 [2]北京冶金部钢铁研究总院

出　　处：《焊接学报》1997年第1期25-30,共6页Transactions of The China Welding Institution

摘　　要：采用金相、扫描电镜（ＳＥＭ）和热模拟方法，研究了不同峰值温度（Ｔｍ）和冷却时间（ｔ８／５）对ＨＱ１３０钢焊接热影响区（ＨＡＺ）显微组织、冲击韧性和断口形态的影响。试验结果表明，峰值温度１３５０℃，ｔ８／５为５～２０ｓ时，ＨＡＺ韧性较好，ｔ８／５为４０ｓ时，ＨＡＺ韧性明显降低。Ｔｍ由１３５０℃降低到８００℃时，ＨＡＺ冲击韧性相应降低；在Ｔｍ＝８００℃附近ＨＡＺ出现脆性区，冲击韧性明显较低；在Ｔｍ＝７００℃附近ＨＡＺ出现回火软化区，冲击韧性较高，硬度明显下降。实际焊接生产中应采用较小的焊接能量（ｑ／ｖ≤２０ｋＪ／ｃｍ），以防止该钢ＨＡＺ软化和脆化现象。The effec of different peak temperature ( Tm ) and cooling time ( t 8/5 ) on microstructure, hardness, impact toughness and fracture morphology in the heat-affected zone (HAZ) of HQ130 steel was studied by using matallography, SEM and the weld thermo-simulation test. Experimental results indicated that the impact toughness in the simulated HAZ was higher when Tm =1350℃ and t 8/5 from 5s to 2s. But when t 8/5 =40s, impact toughness decreased obvioulsy .Impact toughness was decreased when Tm change from 1350℃ to 800℃, under the conditions of a single thermal cycle. There was a brittle zone in the vicinity of Tm =800℃,where the inpact toughness was considerably lower. There was softened zone in the vicinity of Tm =700℃, where the hardness was decreased but the toughness was higher. In practical welding application of multi-layer and multi-pass welding, the welding heat input should be strictly limited ( q/v ≤20kJ/cm), to reduce the softness and brittleness in the HAZ of HQ130 steel.

关 键 词：高强度钢 热影响区 显微组织 冲击韧性 焊接 

分 类 号：TG457.11[金属学及工艺—焊接] TG406