Effect of Nb on Microstructure and Toughness of Heat Affected Zone of Shipbuilding Steel under High Heat Input Welding
摘 要
采用控轧控冷工艺(TMCP)生产含铌(质量分数0.025%)和无铌两种DH36级船板钢,并进行150 kJ·cm-1大热输入气电立焊,研究了焊接接头热影响区的组织与韧性。结果表明:铌元素的添加可推迟铁素体和珠光体相变,促进粒状贝氏体和贝氏体铁素体生成,导致含铌钢热影响区粗晶区中的晶界铁素体含量较少,粒状贝氏体和贝氏体铁素体含量较多,细晶区中的铁素体和珠光体析出缓慢。无铌钢焊接接头各区域的组织与韧性良好,-20 ℃冲击功单值均在102 J以上,远高于船级社规范要求;含铌钢焊接接头熔合线处-20 ℃冲击功出现单值低于24 J的情况,不满足船级社规范要求,其他区域-20 ℃冲击功单值均在143 J以上。铌的添加对DH36级船板钢大热输入焊接接头的韧性不利。
Abstract
Two DH36 shipbuilding steels, containing 0.025wt% Nb and Nb-free, were produced by a controlled rolling and controlled cooling (TMCP) process, and then welded by 150 kJ·cm-1 high heat input gas electric vertical welding. The microstructure and toughness of heat-affected zones of welded joints were studied. The results show that the addition of Nb could delay the transformation of ferrite and pearlite, and promote the formation of granular bainite and bainite ferrite, leading to less grain boundary ferrite and more granular bainite and bainite ferrite in the coarse-grained zone, and the slow precipitation of ferrite and pearlite in the fine-grained zone of the heat-affected zone of the Nb-bearing steel. The microstructure and toughness in different locations of the welded joints of Nb-free steel were good, and every single value of impact energy at -20 ℃ was above 102 J, which was far higher than the requirements of classification society. The Nb-bearing steel welded joint had single values of impact energy at -20 ℃ lower than 24 J, which did not meet the requirements of classification society, but every single value of impact energy at -20 ℃ in other locations was above 143 J. The addition of Nb was detrimental to the toughness of the welded joints of DH36 shipbuilding steel with high heat inputs.
中图分类号 TG406 DOI 10.11973/jxgccl202102005
所属栏目 试验研究
基金项目
收稿日期 2020/5/18
修改稿日期 2021/1/4
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作者单位点击查看
备注韩丽梅(1991-),女,辽宁盘锦人,工程师,硕士
引用该论文: HAN Limei,LI Li,TIAN Meng,QU Jinbo. Effect of Nb on Microstructure and Toughness of Heat Affected Zone of Shipbuilding Steel under High Heat Input Welding[J]. Materials for mechancial engineering, 2021, 45(2): 25~30
韩丽梅,李丽,田猛,曲锦波. 铌对船板钢大热输入焊接热影响区组织与韧性的影响[J]. 机械工程材料, 2021, 45(2): 25~30
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【4】孔维明, 董廷亮, 李超, 等. 线能量对Ti-Mg脱氧EH420钢热影响区组织和低温冲击性能的影响[J]. 热加工工艺, 2019, 48(1):51-54. KONG W M, DONG T L, LI C, et al. Effects of heat input on microstructure and low temperature impact properties of HAZ of EH420 steel deoxidized by Ti-Mg[J]. Hot Working Technology, 2019, 48(1):51-54.
【5】OKATSU M, HAYASHI T, AMANO K. Weldability of advanced extremely-low carbon bainitic steel for thick plates of 570 MPa grade through as-rolled process[J]. Kawasaki Steel Technical Report, 1999(40):56-62.
【6】OHKITA S, WAKABAYASHI M, HOMMA H, et al. Improvement of HAZ toughness of HSLA steel by finely dispersed titanium oxide[J]. Nippon Steel Technical Report, 1988(37):10-16.
【7】MADARIAGA I, GUTIÉRREZ I. Role of the particle-matrix interface on the nucleation of acicular ferrite in a medium carbon microalloyed steel[J]. Acta Materialia, 1999, 47(3):951-960.
【8】OH Y J, LEE S Y, BYUN J S, et al. Non-metallic inclusions and acicular ferrite in low carbon steel[J]. Materials Transactions, JIM, 2000, 41(12):1663-1669.
【9】徐明沁, 苏航, 杨才福, 等. 铌含量对高强船板钢大线能量焊接粗晶区组织性能的影响[J]. 热加工工艺, 2012, 41(9):12-15. XU M Q, SU H, YANG C F, et al. Effect of Nb content on microstructure and toughness of coarse grain heat affected zone in high strength ship steels at high heat input[J]. Hot Working Technology, 2012, 41(9):12-15.
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【11】张英乔, 张汉谦, 赵四新, 等. 铌对高强结构钢大热输入焊接热影响区组织和性能的影响[J]. 焊接学报, 2008, 29(9):96-100. ZHANG Y Q, ZHANG H Q, ZHAO S X, et al. Effects of Nb on microstructure and toughness of high-strength structural steels heat affected zone at high heat input[J]. Transactions of the China Welding Institution, 2008, 29(9):96-100.
【12】MATSUDA F, LI Z L, BERNASOVSKY P, et al. Investigation on the behaviour of the M-A constituent in simulated HAZ of HSLA steels[J]. Welding in the World, 1991, 29(9):307-313.
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