激光束焊接哈氏-X 合金对接接头的开发与分析

G Sathishkumar, S Senthil Murugan, P Sathiya
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摘要

本文介绍了激光焊接 Hastelloy-X (HX) 合金接头的加工和分析。HX 合金用于航空航天和核工业,尤其是高温应用领域。在这项研究中,按照 L9 正交阵列(L9-OA)设计矩阵,对 HX 母材(BM)进行了一系列激光束焊接(LBW)实验,实验编号为 E1 至 E9。采用 CO2 激光技术制造 HX 对接接头。激光功率、焦距和焊接速度是变量。然后,按照 ASTM 标准,用精密的测试方法分析了每个接头的特性。结果表明,每个样品的特性都因参数的选择而不同。E5 样品具有最高的拉伸强度(TS)和延展性,接头效率为 93%。通过微观结构和电子背散射衍射 (EBSD) 研究证实了焊接区 (WZ) 的晶粒延伸和细化。采用恒电位极化法分析了每个接头(E1 至 E9)的腐蚀特性。E1 样品具有最高的耐腐蚀性。腐蚀速率在 7.4E-03 至 8.6E-05 mm/yr 之间。由于 E1 样品的焊接参数具有良好的耐腐蚀性,因此按照 L9-OA 对其进行了干滑动磨损测试(A1 至 A9),测试方法是改变施加载荷、滑动距离和滑动速度。磨损测试结果表明,磨损率随着载荷和滑动距离的增加而增加。还利用这些结果绘制了磨损图,以找出磨损率与磨损参数之间的关联。焊接速度对接头强度有影响,激光功率对 HX 合金接头的腐蚀和磨损有影响。使用光学显微镜(OM)和场发射扫描电子显微镜(FESEM)对焊接区、腐蚀样品和焊点磨损表面进行了进一步分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Development and analysis of Hastelloy-X alloy butt joint made by laser beam welding

Development and analysis of Hastelloy-X alloy butt joint made by laser beam welding

The investigation describes the processing and analysis of laser welded Hastelloy-X (HX) alloy joints through this paper. HX alloys are employed in aerospace and nuclear industries, especially for high-temperature applications. In this research, a series of laser beam welding (LBW) experiments denoted as E1 to E9 were conducted on the HX base metal (BM), adhering to the L9-orthogonal array (L9-OA) design matrix. CO2 laser technology was employed to fabricate HX butt joints. The laser power, focal length and welding speed were the variables. Then, the character of each joint was analyzed by sophisticated testing methods as per ASTM standards. The results showed that the character of each sample was varied depending on the selection of parameters. The E5 sample had a maximum tensile strength (TS) and ductility with 93 % joint efficiency. The grain elongation and refinement in the weld zone (WZ) were confirmed through microstructures and electron back scattered diffraction (EBSD) studies. The corrosion character of each joint (E1 to E9) was analyzed using the potentiostatic polarization method. The E1 sample had the highest corrosion resistance. The corrosion rate was in the range of 7.4E−03 to 8.6E−05 mm/yr. The dry sliding wear test (A1 to A9) was carried out as per L9-OA on the E1 sample, since this weld parameter had good corrosion resistance, by varying applied load, sliding distances and sliding velocities. Wear test results showed an increase in wear rate with the increase in load and sliding distance. A wear map was also drawn using the results to find out the association between wear rates and wear parameters. Weld speed had influenced the strength of the joint and laser power had shown an impact on the corrosion and wear of the HX alloy joints. The weld zone, corroded sample and the worn-out surfaces of weld joints were further analyzed using an optical microscope (OM) and Field Emission Scanning Electron Microscopy (FESEM).

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