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EH36钢埋弧焊接头焊缝金属不均匀性对断裂行为的影响

张承泽1,2,王胜3,龚宝明1,2,邓彩艳1,2,王东坡1,2

张承泽1,2,王胜3,龚宝明1,2,邓彩艳1,2,王东坡1,2. EH36钢埋弧焊接头焊缝金属不均匀性对断裂行为的影响[J]. 焊接学报, 2018, 39(1): 9-12. DOI: 10.12073/j.hjxb.2018390003
引用本文: 张承泽1,2,王胜3,龚宝明1,2,邓彩艳1,2,王东坡1,2. EH36钢埋弧焊接头焊缝金属不均匀性对断裂行为的影响[J]. 焊接学报, 2018, 39(1): 9-12. DOI: 10.12073/j.hjxb.2018390003
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ZHANG Chengze1,2, WANG Sheng3, GONG Baoming1,2, DENG Caiyan1,2, WANG Dongpo1,2. Research on the effects of EH36 weld metal inhomogeneity on fracture behavior[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 9-12. DOI: 10.12073/j.hjxb.2018390003
Citation: ZHANG Chengze1,2, WANG Sheng3, GONG Baoming1,2, DENG Caiyan1,2, WANG Dongpo1,2. Research on the effects of EH36 weld metal inhomogeneity on fracture behavior[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(1): 9-12. DOI: 10.12073/j.hjxb.2018390003
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EH36钢埋弧焊接头焊缝金属不均匀性对断裂行为的影响

Research on the effects of EH36 weld metal inhomogeneity on fracture behavior

摘要

    摘要
  • 摘要: 为研究EH36钢埋弧焊焊缝金属组织不均匀性对裂纹起裂行为的影响，采用微小力学试验系统，对EH36钢埋弧焊焊缝中两种不同取向试样进行微拉伸试验，并对两组试样裂纹萌生机理进行显微观察. 结果表明,两组试样塑性变形均集中在先共析铁素体上，且先共析铁素体上应变分布不均匀；横向加载试样为微孔聚集型断裂，由于“弱”应力奇异性的存在，裂纹在应变集中作用下起源于三叉晶界；纵向加载试样变形集中在先共析铁素体与针状铁素体界面处并导致界面剥离生成裂纹，断口具有局部脆性的特征.
    Abstract: The specimens were cut from weld metal in two orientations, and the micro-tensile test was conducted. The appearance of tensile specimens at different strains were observed with metallographic microscope, confocal laser scanning microscope and scanning electron microscope (SEM) to study the surface morphology and local deformation of specimens during tensile tests. What's more, the fracture morphology of specimens was observed with SEM. The results indicate that plastic deformation concentrates in proeutectoid ferrite in both kinds of specimens and the plastic deformation in PF is not homogenous; for vertical specimen, under the effect of strain concentration which is related to weak stress singularities, the crack starts in grain triple junctions; crack initiation districts of horizontal specimen have the characteristic of local brittle, the crack initiates by interfacial decohesion at proeutectoid ferrite /acicular ferrite interfaces, as a result of plastic deformation concentration in the interface of acicular ferrite and proeutectoid ferrite.
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  • [1] 全国信息与文献标准化技术委员会. 船舶及海洋工程用结构钢: GB 712—2011[S]. 北京： 中国标准出版社, 2011.[2] Tweed J H, Knoot J F. Micromechanisms of failure in C-Mn weld metals[J]. Acta Metallurgica, 1987, 35(7): 1401-1414.[3] 武会宾, 梁国俐, 唐 荻. 大热输入焊接EH36船板钢接头力学性能[J]. 焊接学报, 2012, 33(2): 57-60.Wu Huibin, Liang Guoli, Tang Di. Effects on mechanical properties of high welding heat-input for EH36 shipbuilding steel joint[J]. Transactions of the China Welding Institution, 2012, 33(2): 57-60.[4] 黄安国, 余圣甫, 谢明立, 等. 低合金钢焊缝的针状铁素体微观组织[J]. 焊接学报, 2008, 29(3): 45-48.Huang Anguo, Yu Shengfu, Xie Mingli,et al. Acicular ferrite microstructure of weld metal for low alloy steel[J]. Transactions of the China Welding Institution, 2008, 29(3): 45-48.[5] 蒋庆磊, 李亚江, 王 娟, 等. Q550高强钢焊接接头强韧性匹配[J]. 焊接学报, 2010, 31(10): 65-68.Jiang Qinglei, Li Yajiang, Wang Juan,et al. Strength matching on mechanical properties of welded joint of Q550 high strength steel[J]. Transactions of the China Welding Institution, 2010, 31(10): 65-68.[6] Avramovic-Cingara G, Salen Ch A R, Jain M K,et al. Void Nucleation and growth in dual-phase steel 600 during uniaxial tensile testing[J]. Metallurgical and Materials Transactions A, 2009, 40A: 3117-3127.[7] Paggi M, Carpinteri A. On the stress singularities at multimaterial interfaces and related analogies with fluid dynamics and diffusion[J]. Applied Mechanics Reviews, 2008, 61(61): 409-420.
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  • 收稿日期:  2016-07-03

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