| 高Ti,Nb析出强化高强钢接头强度及焊接热影响区软化行为分析 |
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| 引用本文： | 董现春,张楠,陈延清,张熹,牟淑坤,张飞虎,生海.高Ti,Nb析出强化高强钢接头强度及焊接热影响区软化行为分析[J].焊接学报,2012,33(11):72-76. |
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| 作者姓名： | 董现春 张楠 陈延清 张熹 牟淑坤 张飞虎 生海 |
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| 作者单位： | 首钢技术研究院,北京,100043 |
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| 摘 要： | 采用混合气体（80％Ar＋20％CO2）保护焊对高Ti，Nb析出强化高强钢进行了焊接强度试验研究．结果表明，随着焊接热输入增大，接头强度有降低趋势．焊接热影响区较母材硬度降低，存在软化行为．粗晶区晶粒长大及10nm以下（Ti，Nb，Mo）（C，N）第二相粒子的溶解造成强化效果降低．未溶的（Ti，Nb，Mo）（C，N）第二相粒子固定了C，Mo元素，降低过冷奥氏体的稳定性，不能得到硬度较高的板条状马氏体或贝氏体，而形成硬度较低的粒状贝氏体．第二相强化效果的降低不能通过组织强化有效弥补，从而造成粗晶区软化．在细晶区热循环作用下，10nm以下第二相粒子粗化，使得偏离其临界强化尺寸，析出强化效果降低，造成细晶区软化．
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| 关 键 词： | 析出强化 高强钢 接头强度 HAZ软化 第二相粒子 |
| 收稿时间： | 2012/5/23 0:00:00 |
Welded joint strength and analysis for HAZ softening behavior of high Ti and Nb precipitation strengthened high strength steel |
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| DONG Xianchun,ZHANG Nan,CHEN Yanqing,ZHANG Xi,MU Shukun,ZHANG Feihu and SHENG Hai.Welded joint strength and analysis for HAZ softening behavior of high Ti and Nb precipitation strengthened high strength steel[J].Transactions of The China Welding Institution,2012,33(11):72-76. |
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| Authors: | DONG Xianchun ZHANG Nan CHEN Yanqing ZHANG Xi MU Shukun ZHANG Feihu and SHENG Hai |
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| Affiliation: | Shougang Research Institute of Technology, Beijing 100043, China,Shougang Research Institute of Technology, Beijing 100043, China,Shougang Research Institute of Technology, Beijing 100043, China,Shougang Research Institute of Technology, Beijing 100043, China,Shougang Research Institute of Technology, Beijing 100043, China,Shougang Research Institute of Technology, Beijing 100043, China and Shougang Research Institute of Technology, Beijing 100043, China |
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| Abstract: | Welded joint''s tensile strength of high Ti and Nb precipitation strengthing high strength steel with MAG(80%Ar+20%CO2) was tested.The results show that the welded joint strength decreases with the increasing of the heat input.The hardness of the HAZ is lower than the base metal, and the HAZ has softening behavior.The growth of the grain and dissolution of the(Ti, Nb, Mo)(C, N) second phase particle(< 10 nm) in CGHAZ weakend the precipitation strengthing.The particle without dissolution hold C and Mo, which weaken the stability of the overcooling austenite.The CGHAZ can not have lath martensite or bainite with high hardness, but has granular bainite with low hardness.The decreasing of the precipitation strengthing can not be balanced by structure strengthening, which leads to softening behavior in CGHAZ.The coarsing of the(Ti, Nb, Mo)(C, N) second phase particle(< 10 nm) in FGHAZ, which offsets the critical size with best precipitation strengthing, weakened the precipitation strengthing, led to softening behavior in FGHAZ. |
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| Keywords: | precipitation strengthing high strength steel welded joint strengthing HAZ softening behavior second phase particle |
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