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首页> 外文期刊>Journal of Materials Engineering and Performance >Comparing Reactivation Behavior of TIG and Laser Beam Welded Alloy 690
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Comparing Reactivation Behavior of TIG and Laser Beam Welded Alloy 690

机译：TIG和激光束焊接合金690的再活化行为比较

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摘要

The nickel base Alloy 690 was subjected to simulated autogenous welding treatment employing two different techniques, laser beam welding (LBW) and tungsten inert gas (TIG) welding. The resultant weld fusion zone (WFZ) and heat-affected zone (HAZ) were compared by studying the reactivation behavior. The chromium depletion effect was assessed by measuring the degree of sensitization (DOS) from the electrochemical potentiodynamic reactivation (EPR) test. A double-loop EPR test for Alloy 690 was employed to measure the DOS at different regions of weldments by masking the remaining regions. The results clearly demonstrated that Alloy 690 showed no sensitization in the parent material and the WFZ region of both TIG and laser weldments. However, it exhibited reactivation in the HAZ region of both the weldments. The DOS values measured for Alloy 690 were very low for all the regions of the LBW weldment as compared to that in the TIG weldment. The HAZ region of the LBW weldment showed the highest DOS value in any region of the weldment but even this value was quite low indicating absence of sensitization in LBW weldment. The attack along the grain boundaries for the weldments after EPR experiments were studied using optical and scanning electron microscopy.
机译：镍基合金690使用两种不同的技术，即激光束焊接（LBW）和钨极惰性气体保护（TIG）焊接，进行了模拟自生焊接处理。通过研究再活化行为，比较了所得的焊缝熔合区（WFZ）和热影响区（HAZ）。通过测量电化学势动力再活化（EPR）测试的敏化度（DOS）来评估铬的耗尽效应。采用690合金的双回路EPR测试，通过掩盖其余区域来测量焊件不同区域的DOS。结果清楚地表明，TIG和激光焊件的690合金在母材和WFZ区均未显示敏化。但是，它在两个焊件的热影响区都表现出重新活化。与TIG焊相比，LBW焊的所有区域的690合金测得的DOS值都非常低。 LBW焊件的HAZ区域在焊件的任何区域中显示出最高的DOS值，但即使该值也很低，表明LBW焊件中没有敏化作用。使用光学和扫描电子显微镜研究了EPR实验后焊件沿晶界的侵蚀。

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