激光焊接TRIP590钢焊缝微观结构及形成机理研究

发布时间：2018-07-17 07:36

【摘要】：通过扫描电子显微镜(SEM)、电子背散射分析(EBSD),研究了TRIP590钢激光焊接接头的界面微观结构和形成机理。SEM分析表明,焊接接头焊缝区组织为马氏体组织,热影响区组织主要是贝氏体和铁素体,离焊缝位置越近,马氏体量越多。EBSD分析表明,母材区的晶粒分布均匀,都是大角度晶界,没有明显的择优取向。热影响区晶粒大小不均,贝氏体有相同或相近的取向。焊缝区板条尺寸最为粗大,有明显的织构。残余奥氏体弥散分布在晶粒内部或晶界,焊缝和热影响区晶界取向差都是1°~5°之间的小角度晶界,大量的小角度晶界导致焊缝与热影响区的塑性要小于母材。
[Abstract]:The microstructure and formation mechanism of laser welded joints of TRIP590 steel were studied by scanning electron microscopy (SEM) and electron backscattering analysis (EBSD). The microstructure of the HAZ is mainly bainite and ferrite. The closer to the weld position, the more martensite. EBSD analysis shows that the grain distribution in the base metal region is uniform, all of them are large angle grain boundaries, and there is no obvious preferred orientation. The grain size in the heat affected zone is uneven, and the bainite has the same or similar orientation. The weld strip size is the largest and has obvious texture. The distribution of residual austenite is in the grain interior or grain boundary. The grain boundary orientation difference between weld and heat affected zone is between 1 掳and 5 掳, and a large number of small angle grain boundaries result in less plasticity of weld and HAZ than the base metal.
【作者单位】：山东建筑大学材料科学与工程学院;北京航空制造工程研究所;
【基金】：国家自然科学基金(51305240) 山东省科技发展计划(2013GGX10306)
【分类号】：TG456.7

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