不同热输入下5Mn钢接头组织和强韧性的演变规律
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摘要
研究了30 mm厚5Mn钢接头组织和强韧性在不同热输入下的演变规律。结果表明:焊缝主要由针状铁素体组成。随着热输入的增加,焊缝中晶界铁素体含量增多,而且形态由长条形向块状多边形发展,针状铁素体长大,其板条变宽;HAZ由粗大的板条马氏体组成且原奥氏体晶粒长大。焊缝金属强度和低温冲击韧性均随热输入的增加降低;塑性也降低;在热输入为18 kJ/cm时,粗晶热影响区冲击吸收功较低,表明韧性较差。
The evolution law of structure and strength-toughness of 30 mm thick 5Mn steel joints under different heat input conditions was studied. The results show that the weld mainly consists of acicular ferrite. With the increase of heat input,the content of grain boundary ferrite(GBF) in the weld increases, and the morphology develops from long strip to massive polygon, and the acicular ferrite(AF) grows and the lath becomes wider. The HAZ consists of thick lath martensite and the original austenite grains becomes bigger. The strength and low temperature impact toughness of the weld metal decrease with the increase of heat input, and the plasticity also decreases. When the heat input is 18 kJ/cm, the impact absorption work of CGHAZ is low, indicating that the toughness is poor.
The evolution law of structure and strength-toughness of 30 mm thick 5Mn steel joints under different heat input conditions was studied. The results show that the weld mainly consists of acicular ferrite. With the increase of heat input,the content of grain boundary ferrite(GBF) in the weld increases, and the morphology develops from long strip to massive polygon, and the acicular ferrite(AF) grows and the lath becomes wider. The HAZ consists of thick lath martensite and the original austenite grains becomes bigger. The strength and low temperature impact toughness of the weld metal decrease with the increase of heat input, and the plasticity also decreases. When the heat input is 18 kJ/cm, the impact absorption work of CGHAZ is low, indicating that the toughness is poor.
引文
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[2]狄国标.高强度海洋平台用钢的强韧化机理研究及产品开发[D].沈阳:东北大学,2010.
[3]马成勇,田志凌,杜则裕,等.热输入对800MPa级钢接头组织及性能的影响[J].焊接学报,2004,25(2):23-27.
[4]SindoKoua.焊接冶金学[M].闫久春,杨建国,张广军,译.北京:高等教育出版社,2012.
[5]刘会杰.焊接冶金与焊接性[M].北京:机械工业出版社,2007.
[6]赵品,谢辅洲,孙振国.材料科学基础教程[M].哈尔滨工业大学出版社,2016.
[7]娄宇航,肖红军,彭云,等.690MPa级低合金高强钢焊接接头组织性能[J].材料科学与工艺,2012,20(2):101-107.
[8]谢振家,尚成嘉,周文浩,等.低合金多相钢中残余奥氏体对塑性和韧性的影响[J].金属学报,2016,52(2):224-232.
[9]赵洪运,刘甲坤,骆宗安,等.焊接热输入对800MPa超级钢焊接接头组织性能的影响[J].焊接学报,2011,32(8):5-8.
[10]KumarS,ShahiAS.Effectofheatinputonthemicrostructureand mechanical properties of gas tungsten arc welded AISI 304 stainless steeljoints[J].Materials&Design,2011,32(6):3617-3623.
[11]Min D,Shen J,Lai S,et al.Effect of heat input on the microstructure and mechanical properties of tungsten inertgas arc butt-welded AZ61 magnesium alloy plates[J].Materials Characterization,2009,60(12):1583-1590.