DP540双相钢闪光对焊接头的组织与硬度研究
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摘要
对两种成分的DP540双相钢进行了闪光对焊。采用金相显微镜(OM)、扫描电子显微镜(SEM)和显微硬度计检测了焊接接头的显微组织和显微硬度。试验结果明,1号试样的焊缝中心区的板条马氏体量比2号试样多,2号试样焊缝中心区和粗晶区中铁素体内有岛状马氏体。1号试样焊缝的母材区域马氏体呈大块状,且铁素体较粗大,而2号试样焊缝母材区域的马氏体呈岛状,铁素体较细小。显微硬度测定结果表明,两种试样焊缝特征区域马氏体和铁素体的形态差异是造成显微硬度差异的主要原因。因此,应精确控制DP540双相钢的化学成分,以优化闪光对焊的焊接接头的显微组织、提高其力学性能。
Two-type compositions of DP540 dual-phase steels were flash-butt welded. The welded joints were subjected to microstructure survey and hardness measurements by OM,SEM and microhardness tester. The results indicated that the specimen No. 1 had more amount of martensite than the specimen No. 2 in their weld center,and that there was martensite islands in ferrite of weld center and coarse grain zone of the specimen No. 2. In addition,martensite was in the form of bulk,and ferrite was coarse in base metal of weld of specimen No. 1,whereas martensite was in the form of island,and ferrite was fine in the same zone of the specimen No. 2. From microhardness measurement it was seen that the difference of specimens No. 1 and No. 2 in hardness was mainly attributed to the pattern of martensite and ferrite in the characteristic zone of weld. For this reason,the chemical component of DP 540 dual-phase steel should be precisely controlled for the purpose of improving microstructure thereby mechanical properties of the flash-butt welded joint.
Two-type compositions of DP540 dual-phase steels were flash-butt welded. The welded joints were subjected to microstructure survey and hardness measurements by OM,SEM and microhardness tester. The results indicated that the specimen No. 1 had more amount of martensite than the specimen No. 2 in their weld center,and that there was martensite islands in ferrite of weld center and coarse grain zone of the specimen No. 2. In addition,martensite was in the form of bulk,and ferrite was coarse in base metal of weld of specimen No. 1,whereas martensite was in the form of island,and ferrite was fine in the same zone of the specimen No. 2. From microhardness measurement it was seen that the difference of specimens No. 1 and No. 2 in hardness was mainly attributed to the pattern of martensite and ferrite in the characteristic zone of weld. For this reason,the chemical component of DP 540 dual-phase steel should be precisely controlled for the purpose of improving microstructure thereby mechanical properties of the flash-butt welded joint.
引文
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[2]王柏龄.全铝车身的研究及发展[J].汽车工业研究,2000(6):31-33.
[3]YUKIHISA K,KAZUMASA Y. Progress in ULSAB-AVC project[J]. Journal of the Japan Welding Society,2002,71(8):6-10.
[4]刘文华.高强钢在汽车轻量化中的应用[J].汽车工艺与材料,2008(11):49-51.
[5]姜沪,李麟,何艳霖,等.汽车钢近年来的发展、问题、处理和展望[J].上海金属,2017,39(6):76-80.
[6] WANG W B,SHI Y W,LEI Y P,et al. FEM simulation on microstructure of DC flash butt welding for an ultra-fine grain steel[J]. Journal of Materials Processing Technology,2005,41(1):497-503.
[7]XU Z X,LU P,SHU Y. Microstructure and fracture mechanism of a flash butt welded 380CL steel[J]. Engineering Failure Analysis,2016,62:199-207.
[8] ZIEMIAN C W,SHARMA M M,WHALEY D E. Effects of flashing and upset sequences on microstructure,hardness,and tensile properties of welded structural steel joints[J]. Materials and Design,2012,33(1):175-184.
[9]周龙.冷轧DP590用热轧原料焊接接头的组织性能研究[D].鞍山:辽宁科技大学,2016.
[10]关浩. 540/590 MPa级车轮钢轧制工艺及使用性能研究[D].沈阳:东北大学,2013.
[11] XI C Y,SUN D Q,XUAN Z Z,et al. Microstructures and mechanical properties of flash butt welded high strength steel joints[J]. Materials and Design,2016,96:506-514.
[12]祝志峰,赵征志,赵爱民,等. Si对高强热轧双相钢组织性能的影响[J].轧钢,2011,28(2):16-18.
[13]李胜利,田琮,宋沂生.锰对热轧Si-Mn双相钢再结晶的影响[J].兵器材料科学与工程,1992,15(2):29-32.
[14]刘志伟,郭晓宏,张瑞琦,等.屈服强度700 MPa级冷轧耐候双相钢的组织与性能[J].上海金属,2017,39(2):31-34.
[15] XI C Y,SUN D Q,XUAN Z Z,et al. The effects of flash allowance and upset allowance on microstructures and mechanical properties of flash butt welded RS590CL steel joints[J]. Journal of Materials Research,2016,31(24):3968-3980.
[16]田志强,唐荻,江海涛.汽车用双相钢的研究与生产现状[J].机械工程材料,2009,33(4):1-5.
[17]白山,田琮.硅对形变Si-Mn双相钢回复及再结晶的影响[J].北京科技大学学报,1992,14(4):463-469.
[18]朱德珑,姚羿,张梅.温轧工艺对Fe-C-Mn-Si双相钢组织和性能的影响[J].上海金属,2017,39(6):31-35.
[19] NOURI A,SAGHAFIAN H,KHEIRANDISH S. Effects of silicon content and intercritical annealing on manganese partitioning in dual phase steels[J]. Journal of Iron and Steel Research(International),2010,17(5):44-50.
[20]SODJIT S, UTHAISANGSUK V. Microstructure based prediction of strain hardening behavior of dual phase steels[J].Materials and Design,2012,41:370-379.
[21]BERGSTROM Y, GRANBOM Y, STERKENBURG D. A dislocation-based theory for the deformation hardening behavior of DP steels:impact of martensite content and ferrite grain size[J]. Journal of Metallurgy,2010:1-16.