高强度桥梁钢焊接热影响区组织相变的研究
Study on Phase Transition of HAZ of High Strength Bridge Steel
贾坤宁，王海东，姜秋月
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作者单位：长春工程学院 机电工程学院，吉林 长春 130012
中文关键字：高强度桥梁钢； 热影响区； 相变
英文关键字：high strength bridge steel; HAZ; phase transition
中文摘要：通过不同冷却速度条件下的热模拟实验和显微硬度测试对高强度桥梁钢进行了焊接热影响区组织相变的研究。实验结果表明：Q460q当冷速较慢时,热影响区奥氏体内部形成大量的针状铁素体、少量珠光体、粒状铁素体和少量粒状贝氏体的混合组织;随着冷却速度加快,铁素体的量减少, 粒状贝氏体的量不断增多,显微硬度值升高;当冷却速度进一步加快, 组织中板条贝氏体量增多,开始发生部分马氏体相变,显微硬度急剧升高。
英文摘要：The phase transition of heat affected zone(HAZ) of high strength bridge steel was studied with thermal simulation test and hardness test at different cooling rate. The results show that, when the cooling rate is slow, the microstructure of HAZ are acicular ferrite, pearlite, ferrite and a small amount of granular bainite, with the cooling rate faster, the amount of ferrite reduces, the amount of granular bainite increases, the hardness value increases; when the cooling rate is further accelerated, the amount of lath bainite organization increases, partial martensitic transformation occurs,the hard-ness increases rapidly.