摘要
对低碳贝氏体钢进行双面埋弧焊焊接,并采用光学显微镜和维氏硬度计对焊接接头的显微组织与维氏硬度进行研究。结果表明:低碳贝氏体钢双面埋弧焊后,接头反面焊的焊缝宽度和余高比正面焊的要高,组织为针状铁素体和粒状贝氏体;HAZ的组织为贝氏体铁素体和粒状贝氏体;母材区域的组织为板条铁素体和粒状贝氏体;HAZ熔合线附近的硬度值最高,远离熔合线硬度降低,并逐渐接近母材金属的硬度;Mn元素的偏析增加了边界阻尼,致使晶粒长大倾向降低,硬度值偏高。
The two-sided submerged-arc welding of low carbon bainitic steel was studied. The microstructure of the welded joint was characterized by optical microscope and the hardness was characterized by Vickers hardness test. The results show that the width and height of back weld seam is bigger than in front. The microstructure is acicular ferrite and granular bainite. The microstructure of the HAZ is bainite ferrite and granular bainite, the base metal is granular bainite and lath ferrite. The hardness is the highest near weld bond of HAZ and decrease away from it, gradually approaching to the hardness of base metal. The segregation of manganese increases boundary damping, which can decrease the grain growth tendency and increase the hardness.
出处
《热加工工艺》
CSCD
北大核心
2015年第1期187-189,192,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51274162)
陕西省教育厅产业化培训项目(2012JC1)
西安市科技计划项目(CX 12136)
关键词
低碳贝氏体钢
埋弧焊
显微组织
硬度
low carbon bainite steel
submerged-arc welding
microstructure
hardness
