冯玉兰, 吴志生, 刘翠荣, 等. 轧制复合板及焊接接头组织与力学性能[J]. 焊接, 2023(4):37 − 44. DOI: 10.12073/j.hj.20221128002
引用本文: 冯玉兰, 吴志生, 刘翠荣, 等. 轧制复合板及焊接接头组织与力学性能[J]. 焊接, 2023(4):37 − 44. DOI: 10.12073/j.hj.20221128002
Feng Yulan, Wu Zhisheng, Liu Cuirong, et al. Microstructure and mechanical properties of rolled composite plate and welded joint[J]. Welding & Joining, 2023(4):37 − 44. DOI: 10.12073/j.hj.20221128002
Citation: Feng Yulan, Wu Zhisheng, Liu Cuirong, et al. Microstructure and mechanical properties of rolled composite plate and welded joint[J]. Welding & Joining, 2023(4):37 − 44. DOI: 10.12073/j.hj.20221128002

轧制复合板及焊接接头组织与力学性能

Microstructure and mechanical properties of rolled composite plate and welded joint

  • 摘要: 为了能够更好的指导复合材料焊接工艺的制定,采用自熔等离子弧焊、埋弧焊和钨极气体保护焊3种焊接方法进行组合焊接。焊后通过金相显微镜、扫描电子显微镜、X射线能谱仪等分析方法,分析了轧制复合板及其接头的微观组织、界面元素分布、显微硬度及拉伸性能。结果表明,基材和覆材(复合材料的耐腐蚀层)界面元素扩散层厚度约10 µm,由于增碳层和脱碳层的存在,显微硬度值随之升高和降低,抗拉强度达665 MPa,断口形貌呈韧脆混合断裂特征。焊接后,基材与过渡层焊缝界面扩散层厚度约5 µm,基材与覆层焊缝界面扩散层厚度约3 µm;第一道覆层焊缝由于受到多道焊缝焊接热的作用,铁素体体积分数含量达65 %,平均显微硬度约380 HV0.2;接头抗拉强度与复合板相比降低约11 %,断口韧窝大小、深度明显减小,断裂在焊缝处。

     

    Abstract: To better guide the development of the welding process of composite material, the welding was carried out by three welding methods: self-fusing plasma arc welding, submerged arc welding and tungsten inert gas welding. After welding, the microstructure, interfacial element distribution, microhardness and tensile properties of rolled composite plate and joint were studied by metallographic microscope, scanning electron microscope, X-ray energy spectrum. The result showed the base material and cladding material (check the corrosion resistance of the material) interface element diffusion layer thickness was about 10 µm, because of the existence of carburization layer and the decarburization layer, microhardness values incrensed and decreased accordingly, and tensile strength was 665 MPa, The fracture morphology showed mixed fracture characteristics of toughness and brittleness. After welding, the thickness of the diffusion layer at the interface of the base material and transition layer weld was about 5 µm, and the thickness of the diffusion layer at the interface of the base material and cladding layer weld was about 3 µm; The ferrite content of the first cladding weld reached 65% and the average microhardness was about 380 HV0.2 due to the action of multi-pass welding heat. Compared with the composite plate, the tensile strength of the joint was reduced by about 11%,, the size and depth of the dimple were clarity reduced, and the fracture location was at the weld.

     

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