Scholarlink

<p>A517-B steel is an important material used in offshore engineering. Currently, there is no available report on how multiple repairs at the same location affect this steel. This study was conducted to evaluate the impact of multiple weld repairs on the microstructure, mechanical properties, and stress corrosion cracking behavior of this steel. Welding was performed by submerged metal arc welding (SMAW) with H18CrMoA filler rod. The four repaired weld samples were produced using identical welding parameters. The samples were analyzed by: mechanical performance through tensile, Charpy impact, and hardness tests; microstructural characteristics with an optical microscope; and SCC behavior via slow-strain-rate test (SSRT) testing and fractography. The tensile test results showed that increasing the number of weld repairs up to two times resulted in a decrease in the total tensile strength as well as a decrease in the percentage of elongation. The third repaired sample showed a significantly higher strength drop than the previously repaired samples, with a lower value than the base metal (908.9&#xa0;MPa). In terms of microstructural representation, the heat-affected zone (HAZ) area experienced grain growth as the repair welding progressed. However, in the third repaired sample, the HAZ structure had undergone a phase change, transforming martensite into ferrite. Hardness measurements indicated that the third repaired sample had reduced microhardness values. The brittle fracture, together with the reduced impact values (49.9&#xa0;J) in the third repaired sample obtained from the Charpy test, confirmed the results of the tensile and hardness tests. According to the SSRT test results, under open-circuit potential condition, the samples exhibited high elongation and the presence of dimples on the fracture surfaces, indicating ductile fracture, while cathodic polarization with potentials of − 950&#xa0;mV resulted in a significant reduction of fracture strains, indicating some susceptibility to SCC under these conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Multiple Weld Repairs on Microstructure, Mechanical Properties, and Stress Corrosion Cracking Behavior of Quenched and Tempered A 517-B Steel

  • 期刊论文

  • 发表日期：

    2025年8月12日

查看全文
  • Behnam Hosseinzaei,
  • Peyman Shayanfar

摘要

A517-B steel is an important material used in offshore engineering. Currently, there is no available report on how multiple repairs at the same location affect this steel. This study was conducted to evaluate the impact of multiple weld repairs on the microstructure, mechanical properties, and stress corrosion cracking behavior of this steel. Welding was performed by submerged metal arc welding (SMAW) with H18CrMoA filler rod. The four repaired weld samples were produced using identical welding parameters. The samples were analyzed by: mechanical performance through tensile, Charpy impact, and hardness tests; microstructural characteristics with an optical microscope; and SCC behavior via slow-strain-rate test (SSRT) testing and fractography. The tensile test results showed that increasing the number of weld repairs up to two times resulted in a decrease in the total tensile strength as well as a decrease in the percentage of elongation. The third repaired sample showed a significantly higher strength drop than the previously repaired samples, with a lower value than the base metal (908.9 MPa). In terms of microstructural representation, the heat-affected zone (HAZ) area experienced grain growth as the repair welding progressed. However, in the third repaired sample, the HAZ structure had undergone a phase change, transforming martensite into ferrite. Hardness measurements indicated that the third repaired sample had reduced microhardness values. The brittle fracture, together with the reduced impact values (49.9 J) in the third repaired sample obtained from the Charpy test, confirmed the results of the tensile and hardness tests. According to the SSRT test results, under open-circuit potential condition, the samples exhibited high elongation and the presence of dimples on the fracture surfaces, indicating ductile fracture, while cathodic polarization with potentials of − 950 mV resulted in a significant reduction of fracture strains, indicating some susceptibility to SCC under these conditions.