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960 MPa高强钢金属粉芯型药芯焊丝焊缝金属韧化机理

刘政军,裘荣鹏,武丹,苏允海

刘政军,裘荣鹏,武丹,苏允海. 960 MPa高强钢金属粉芯型药芯焊丝焊缝金属韧化机理[J]. 焊接学报, 2018, 39(1): 102-106. DOI: 10.12073/j.hjxb.2018390023
引用本文: 刘政军,裘荣鹏,武丹,苏允海. 960 MPa高强钢金属粉芯型药芯焊丝焊缝金属韧化机理[J]. 焊接学报, 2018, 39(1): 102-106. DOI: 10.12073/j.hjxb.2018390023
LIU Zhengjun, QIU Rongpeng, WU Dan, SU Yunhai. Research on toughening mechanism of weld metal with metal powder flux-cored wire for 960 MPa high strength steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 102-106. DOI: 10.12073/j.hjxb.2018390023
Citation: LIU Zhengjun, QIU Rongpeng, WU Dan, SU Yunhai. Research on toughening mechanism of weld metal with metal powder flux-cored wire for 960 MPa high strength steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 102-106. DOI: 10.12073/j.hjxb.2018390023

960 MPa高强钢金属粉芯型药芯焊丝焊缝金属韧化机理

Research on toughening mechanism of weld metal with metal powder flux-cored wire for 960 MPa high strength steel

  • 摘要: 针对960 MPa高强钢研制了以Mn,Ni,Mo和Cr元素为主要合金体系,以Ti,B,Nb和Al元素为微合金元素的金属粉芯型药芯焊丝. 采用熔化极气体保护焊进行施焊,通过拉伸试验和低温冲击试验等方法对接头力学性能进行了测试,结合金相组织观察、断口扫描、能谱分析和透射电镜观察等对合金元素的作用机理进行了分析. 结果表明,接头抗拉强度平均值为952.24 MPa,-20 ℃焊缝低温冲击吸收功平均值为70 J,研制的焊丝在保证接头强度的同时有效改善了焊缝金属的低温冲击吸收功. 在药芯成分中,主要合金元素起固溶强化和弥散强化作用,微合金元素通过细化晶粒、抑制块状铁素体析出和增加针状铁素体形核率等方式改善低温冲击性能.
    Abstract: Metal powder flux-cored wire for 960MPa high strength steel was developed, which adding Mn、Ni、Mo and Cr as main alloy system, and adding Ti, B, Nb and Al as microalloying system. Mechanical properties of welded joint which was welded by gas metal arc welding was tested by tensile testing and low temperature impact testing. The mechanism of adding alloy element into wire powder was analyzed by microstructure observation, scanning electron microscope testing, energy dispersive spectrometer analysis and transmission electron microscope testing. The results show that the average tensile strength of welded joint is 952.24 MPa, and the low temperature impact energy at -20 ℃ is 70 J. The low temperature impact energy of weld metal will improve by self-developed flux cored wire, and the strength of welded joint still keep higher. The main alloying elements adding into wire powder can improve strength by solid solution strengthening and dispersion strengthening. Microalloying elements can improve low temperature impact toughness of weld metal by refining grain, blocking generate proeutectoid ferrite, and increasing nuclear opportunity of acicular ferrtie in the grain.
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  • 收稿日期:  2017-05-14

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