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汤忖江, 安同邦, 彭云, 林纯丞, 马成勇, 刘旭明. 焊接热输入对690 MPa级HSLA钢焊缝金属组织与力学性能的影响[J]. 焊接学报, 2024, 45(9): 110-119. DOI: 10.12073/j.hjxb.20230501001
引用本文: 汤忖江, 安同邦, 彭云, 林纯丞, 马成勇, 刘旭明. 焊接热输入对690 MPa级HSLA钢焊缝金属组织与力学性能的影响[J]. 焊接学报, 2024, 45(9): 110-119. DOI: 10.12073/j.hjxb.20230501001
TANG Cunjiang, AN Tongbang, PENG Yun, LIN Chuncheng, MA Chengyong, LIU Xuming. Effect of heat input on microstructure and mechanical properties of weld metal of 690 MPa grade HSLA steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(9): 110-119. DOI: 10.12073/j.hjxb.20230501001
Citation: TANG Cunjiang, AN Tongbang, PENG Yun, LIN Chuncheng, MA Chengyong, LIU Xuming. Effect of heat input on microstructure and mechanical properties of weld metal of 690 MPa grade HSLA steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(9): 110-119. DOI: 10.12073/j.hjxb.20230501001

焊接热输入对690 MPa级HSLA钢焊缝金属组织与力学性能的影响

Effect of heat input on microstructure and mechanical properties of weld metal of 690 MPa grade HSLA steel

  • 摘要: 采用自研直径4.0 mm的焊条对厚度为27 mm的690 MPa级HSLA钢进行不预热焊接,研究了焊接热输入对焊缝金属组织和性能的影响及强韧化机理. 结果表明,焊接热输入由13 kJ/cm提高至19 kJ/cm对焊缝金属组织结构及其强韧性产生了显著影响,对接接头抗拉强度、硬度呈现降低趋势,焊缝金属−50 ℃冲击吸收能量呈现先升高后降低趋势. 16 kJ/cm热输入条件下获得了良好的强韧性,对接接头抗拉强度为828 MPa,焊缝中心−50 ℃冲击吸收能量为71 ~ 90 J,均值为80 J. 13 kJ/cm及19 kJ/cm热输入条件下焊缝金属强韧性较低,前者与焊缝金属中板条贝氏体及侧板条铁素体形成有关,后者与其中粗大的M-A组元形成相关. 热输入16 kJ/cm条件下,充分形成了塑性良好的针状铁素体组织,针状铁素体和贝氏体呈交织分布,同时,细小弥散分布的M-A组元并未对其韧性产生显著的负面作用,焊缝金属获得了良好的强韧性配合.

     

    Abstract: 690 MPa grade high strength low alloy (HSLA) steel of 27 mm in thickness was welded by self-developed electrode of 4.0 mm in diameter without preheating. The effects of heat input on microstructure and mechanical properties of weld metal were studied and the mechanism of strength-toughness was revealed. The results show that heat input had significant effect on microstructure and mechanical properties of weld metal, which increased from 13 kJ/cm to 19 kJ/cm. With the increasing of heat input, tensile strength and hardness of butt joint decreased, −50 ℃ impact energy firstly increased and then decreased. Good strength-toughness was obtained under the heat input condition of 16 kJ/cm. The tensile strength of butt joint was 828 MPa, −50 ℃ impact energy of weld metal was 71 ~ 90 J, the average value was 80 J. The lower strength-toughness properties of weld metal under 13 kJ/cm and 19 kJ/cm heat input conditions were related with the formation of lath bainite and ferrite side plates, the formation of coarse M-A, respectively. Under the 16 kJ/cm heat input condition, good plasticity acicular ferrite was sufficiently formed and acicular ferrite and bainite were distributed in an interwoven pattern. Meanwhile, small and dispersively distributed M-A had no obviously negative effect on toughness of weld metal. Therefore, weld metal with excellent strength-toughness had been obtained.

     

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