Quantitative analysis of susceptibility to intergranular corrosion in alloy 625 joined by friction stir welding
Quantitative analysis of susceptibility to intergranular corrosion in alloy 625 joined by friction stir welding
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DOI：
10.1080/1478422x.2022.2152174
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
E. B. Fonseca;A. Z. Fatichi;M. Terada;A. Bugarin;José Raúl Rodríguez Rodríguez-José-Raúl-Rodríguez-Rodríguez-50388497;I. Costa;A. Ramirez
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文献类型：
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作者：
E. B. Fonseca;A. Z. Fatichi;M. Terada;A. Bugarin;José Raúl Rodríguez Rodríguez-José-Raúl-Rodríguez-Rodríguez-50388497;I. Costa;A. Ramirez
合金625是一种镍基合金，用于航空航天、能源、化工、石油和天然气工业，由于其耐腐蚀性、高强度和高温抗蠕变性，主要用作覆层材料。在这项研究中，显微组织评价和晶间腐蚀敏感性的母材和搅拌摩擦焊625合金进行了研究。搅拌摩擦焊接接头表现出较低的腐蚀速率和敏化程度相比，基体金属。这主要是由于搅拌摩擦焊接过程中晶粒细化和冷却速度较低造成的。与母材相比，搅拌区晶粒细化，孪晶界密度降低，提高了焊缝的力学性能和耐腐蚀性能。
Alloy 625 is a Ni-based alloy used in aerospace, energy, chemical, oil and gas industries, mainly as cladding material due to its corrosion resistance, high strength and creep resistance at high temperature. In this study, microstructural evaluation and susceptibility to intergranular corrosion of base metal and friction stir welded Alloy 625 were investigated. Friction stir welded joints exhibited a lower corrosion rate and degree of sensitisation compared to the base metal. It is mainly due to grain refinement and lower cooling rate of the friction stir welding process. The stir zone of the present weld has a finer grain structure and lower density of twin boundaries than the base metal and it led to the improvement of the mechanical and corrosion properties.