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<p>This study employs electron beam welding (EBW) to investigate the microstructural and mechanical properties of HY 282 alloy and its effect on post-weld heat treatment (PWHT), which has yet to be reported. The EBW of HY 282 alloy produced a narrow, deep penetration weld with promising strength. The properties of the samples obtained after EBW and post-weld heat treatment (PWHT) were compared. As a result, in microstructural analysis, fine dendritic, columnar, and elongated tree-like structures were predominantly observed in the fusion zone following welding and post-weld heat treatment (PWHT). Furthermore, the FESEM analysis ensured the weldments were crack-free. Subsequently, for the welded samples, tensile strength (839 ± 5&#xa0;MPa) and microhardness (314 ± 5 HV) were found to be improved by about 5 and 32%, respectively, compared to that of the base metal (UTS 800 ± 5&#xa0;MPa and MH 238 ± 5 HV). Moreover, the tensile strength (1158 ± 5&#xa0;MPa) and microhardness (420 ± 5 HV) of the PWHT samples were observed to be 30–40% higher compared to those of the weld. The fractography results confirmed that the fracture morphology is essentially ductile, which provided superior mechanical strength. Finally, EBW and its PWHT had been recommended for HY 282 alloy for promising strength, a crack-free weld, and high-temperature sustainability.</p>

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A Comparative Study on Effects of Age-Hardening Heat Treatment on Microstructural and Mechanical Properties of Electron Beam-Welded HY 282 Alloy

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Anupam Kundu,
  • Dilip Kumar Pratihar,
  • Debalay Chakrabarti

摘要

This study employs electron beam welding (EBW) to investigate the microstructural and mechanical properties of HY 282 alloy and its effect on post-weld heat treatment (PWHT), which has yet to be reported. The EBW of HY 282 alloy produced a narrow, deep penetration weld with promising strength. The properties of the samples obtained after EBW and post-weld heat treatment (PWHT) were compared. As a result, in microstructural analysis, fine dendritic, columnar, and elongated tree-like structures were predominantly observed in the fusion zone following welding and post-weld heat treatment (PWHT). Furthermore, the FESEM analysis ensured the weldments were crack-free. Subsequently, for the welded samples, tensile strength (839 ± 5 MPa) and microhardness (314 ± 5 HV) were found to be improved by about 5 and 32%, respectively, compared to that of the base metal (UTS 800 ± 5 MPa and MH 238 ± 5 HV). Moreover, the tensile strength (1158 ± 5 MPa) and microhardness (420 ± 5 HV) of the PWHT samples were observed to be 30–40% higher compared to those of the weld. The fractography results confirmed that the fracture morphology is essentially ductile, which provided superior mechanical strength. Finally, EBW and its PWHT had been recommended for HY 282 alloy for promising strength, a crack-free weld, and high-temperature sustainability.