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首页> 外文期刊>Journal of Materials Research >Characterization of weldability, microstructure, and corrosion resistance of dissimilar welded joint between Mo_2FeB_2-based cermets and 316L stainless steel
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Characterization of weldability, microstructure, and corrosion resistance of dissimilar welded joint between Mo_2FeB_2-based cermets and 316L stainless steel

机译：Mo_2FeB_2基金属陶瓷与316L不锈钢的异种焊接接头的可焊性，显微组织和耐蚀性的表征

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摘要

The joint of dissimilar metals between Mo_2FeB_2-based cermets and 316L stainless steel was welded by gas tungsten arc welding with no fillers. The weldability was investigated by plate rigid restraint cracking test and transverse rupture strength was measured by the three-point bending test. Microstructure of the weld joint was studied with scanning electron microscope, energy-dispersive spectrometer, X-ray diffractometer and differential scanning calorimeter, etc. Corrosion behavior was investigated by the potentiodynamic polarization test. Results revealed that weld solidification cracking susceptibility existed in the fusion zone. Coarse irregular complex ternary boride phase (M_3B_2) and hypoeutectic microstructure were formed in weld metal (WM). In heat affected zone (HAZ), a small number of M_3B_2 grains dissolved into the γ-Fe based binder, with growth and coalescence of the remaining M_3B_2 grains. Microhardness of HAZ increased slightly and WM presented the highest microhardness in the whole joint. Besides, potentiodynamic polarization test showed that WM had a better corrosion resistance than Mo_2FeB_2-based cermets, which can be attributed to the higher Cr content and relatively homogenous Mo distribution.
机译：Mo_2FeB_2基金属陶瓷与316L不锈钢之间的异种金属接头采用不带填充剂的钨极氩弧焊进行焊接。通过板刚性约束裂纹试验研究可焊接性，并且通过三点弯曲试验测量横向断裂强度。用扫描电子显微镜，能量色散光谱仪，X射线衍射仪和差示扫描量热仪等研究了焊接接头的显微组织。通过电位极化试验研究了腐蚀行为。结果表明，熔合区存在焊缝凝固裂纹敏感性。在焊缝金属（WM）中形成了粗大的不规则复合三元硼化物相（M_3B_2）和亚共晶组织。在热影响区（HAZ）中，少量M_3B_2晶粒溶解在γ-Fe基粘结剂中，其余M_3B_2晶粒生长并聚结。 HAZ的显微硬度略有增加，WM在整个关节中表现出最高的显微硬度。此外，电位极化试验表明，WM比Mo_2FeB_2基金属陶瓷具有更好的耐腐蚀性，这可以归因于较高的Cr含量和相对均匀的Mo分布。

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  • 来源
    《Journal of Materials Research》 |2015年第23期|3653-3662|共10页
  • 作者

    Shaoning Geng; Junsheng Sun; Lingyu Guo; Honggen Sun; Hongquan Wang;

  • 作者单位

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, Shandong Province, People's Republic of China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, Shandong Province, People's Republic of China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, Shandong Province, People's Republic of China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, Shandong Province, People's Republic of China;

    Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, Shandong Province, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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