热成形钢/T型镀锌螺母的电容储能凸焊接头组织及性能
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摘要
文中探究了热成形钢USIBOR1500与T型镀锌螺母储能凸焊工艺,研究了焊接电压对凸焊接头几何属性和力学性能的影响规律,并分析了凸焊接头的组织演变、硬度分布、失效断裂模式以及断口形貌.结果表明:随着焊接电压的升高,焊点直径变化较小,熔核直径先增大后减小,接头推出强度先升高后降低;凸焊接头的断裂模式为界面断裂模式、拔出断裂模式和拔出-界面断裂模式;界面断裂为准解理断裂,拔出断裂和拔出-界面断裂同时具有滑移分离断裂和解理断裂;热影响区软化发生在热成形钢侧不完全淬火区和回火区.
Resistance projection welding of T-type galvanized nuts to USIBOR1500 hot-stamped steels was analyzed by the capacitor discharging welding process( CDW). In this investigation,the effect of voltages on the welded physical attributes and the mechanical properties of joints were investigated. The hardness profiles,microstructure evolutions and failure modes of welded joints were studied. Results show that with the increase of welding voltages both the nugget diameter and the pull-out strength first increase and then decrease,while the weld point diameter varies slightly. The welded joints fail in three modes: interfacial failure mode( IF),pullout failure mode( PF)and PF-IF mode. Quasi cleavage fracture surface is observed on the fracture of IF mode. Slip separation and quasi cleavage fracture surface are found on the fracture of PF and PF-IF mode. Pronounced HAZ softening occurs on ICHAZ and SCHAZ zone due to the appearance of bainite,ferrite and tempered martensite.
Resistance projection welding of T-type galvanized nuts to USIBOR1500 hot-stamped steels was analyzed by the capacitor discharging welding process( CDW). In this investigation,the effect of voltages on the welded physical attributes and the mechanical properties of joints were investigated. The hardness profiles,microstructure evolutions and failure modes of welded joints were studied. Results show that with the increase of welding voltages both the nugget diameter and the pull-out strength first increase and then decrease,while the weld point diameter varies slightly. The welded joints fail in three modes: interfacial failure mode( IF),pullout failure mode( PF)and PF-IF mode. Quasi cleavage fracture surface is observed on the fracture of IF mode. Slip separation and quasi cleavage fracture surface are found on the fracture of PF and PF-IF mode. Pronounced HAZ softening occurs on ICHAZ and SCHAZ zone due to the appearance of bainite,ferrite and tempered martensite.
引文
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[2]宫永玉,王曌,张志鹏.新能源汽车轻量化途径及其评价[J].汽车实用技术,2017(1):5-6.GONG Yong-yu,Wang Zhao,ZHANG Zhi-peng.New energy vehicles lightweight approach and its evaluation[J].Automobile Applied Technology,2017(1):5-6.
[3]吝章国.先进高强度汽车用钢板研究进展与技术应用现状[J].河北冶金,2016(1):1-7.LIN Zhang-guo.Research progress and present technology application situation of advanced high-strength automobile steels[J].Hebei Metallurgy,2016(1):1-7.
[4]武万斌,年雪山.汽车轻量化技术发展趋势[J].汽车工程师,2017(1):15-17.WU Wan-bin,NIAN Xue-shan.Development of vehicle lightweight technology[J].Auto Engineer,2017(1):15-17.
[5]SUN H,PING H U,NING M A,et al.Application of hot forming high strength steel parts on car body in side impact[J].Chinese Journal of Mechanical Engineering,2010,23(2):252-256.
[6]金爱君,孙风蔚,陈杰龙,等.热成型钢板在汽车前横梁上的应用[J].吉林大学学报(工学版),2011(s2):104-107.JIN Ai-jun,SUN Feng-wei,CHEN Jie-long,et al.Application of hot-formed sheet steel to front cross member of vehicle[J].Journal of Jilin University(Engineering and Technology Edition),2011(s2):104-107.
[7]TOLF E.Challenges in resistance welding of ultra high strength steel[D].Stockholm,Sweden:KTH Royal Institute of Technology,2015.
[8]SCOTCHMER N.The use of capacitor discharge welding is on the rise[J].Welding Journal,2015,94(2):32-36.
[9]SAFANAMA D S,MARASHI S P H,POURANVARI M.Similar and dissimilar resistance spot welding of martensitic advanced high strength steel and low carbon steel:me tallurgical characteristics and failure mode transition[J].Science&Technology of Welding&Joining,2012,17(4):288-294.
[10]ZHANG J P,FENG Y,SONG L F,et al.Research on resistance spot welding property of hot-stamping quenched steel sheets[J].Advanced Materials Research,2015,1063:120-125.
[11]TAMIZI M,POURANVARI M,MOVAHEDI M.Welding metallurgy of martensitic advanced high strength steels during resistance spot welding[J].Science&Technology of Welding&Joining,2016,22(4):327-335.
[12]韩立军,谷诤巍,张正林.超高强淬火钢板中频点焊接头组织与断口形貌[J].焊接学报,2010,31(4):101-104.HAN Li-jun,GU Zheng-wei,ZHANG Zheng-lin.Microstructure and fractography of intermediate frequency spot welding of precision ultra-high strength quenching steel[J].Transactions of the China Welding Instition,2010,31(4):101-104.
[13]杨柳,程轩挺,孙游,等.超高强热成形钢B1500HS的电阻点焊工艺和接头性能[J].上海交通大学学报,2012,46(7):1103-1106.YANG Liu,CHENG Xuan-ting,SUN You,et al.Technology and weldability resistance spot welding of B1500HShot-stamped steel[J].Journal of Shanhai Jiaotong University,2012,46(7):1103-1106.
[14]WANG X,ZHANG Y.Effects of welding procedures on resistance projection welding of nuts to sheets[J].Isij International,2017,57(12):2194-2200.
[15]NIELSEN C V,ZHANG W,MARTINS P A F,et al.3Dnumerical simulation of projection welding of square nuts to sheets[J].Journal of Materials Processing Technology,2015,215(1):171-180.
[16]RINGSBERG J W,ORVEGREN P,HENRYSSON H F,et al.Sheet metal fatigue near nuts welded to thin sheet structures[J].International Journal of Fatigue,2008,30(5):877-887.
[17]LIM S S,KIM Y T,CHUN E J,et al.Effect of chemical composition of nut material on the fracture behavior in nut projection welding of hot-stamped steel sheet[J].2016,34(2):1-10.