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首页> 外文期刊>Journal of Manufacturing Processes >Friction stir welding: An alternative to fusion welding for better stress corrosion cracking resistance of maraging steel
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Friction stir welding: An alternative to fusion welding for better stress corrosion cracking resistance of maraging steel

机译：搅拌摩擦焊：替代熔焊，以提高马氏体时效钢的抗应力腐蚀开裂性能

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摘要

Friction stir welding (FSW), a solid state welding process, is generally used for welding soft materials like aluminium and magnesium alloys. In this work, maraging steel, an ultra high strength steel, is welded using FSW process. Major problems associated with fusion welded maraging steel, i.e segregation of alloying elements and formation of reverted austenite pool, were suppressed by FSW. Slow strain rate stress corrosion characteristic of 18%Ni maraging steel (grade-250) and its weldinents, by gas tungsten arc welding (GTAW) and FSW, has been investigated in air and 3.5% NaCI solution. It was observed that FSW joints demonstrated higher resistance to stress corrosion cracking (SCC) compared to both, base metal and gas tungsten arc weldments. Improved stress corrosion resistance of friction stir weldments was correlated to microstructural differences and residual stress. Fine grain structure, absence of segregation of alloying elements and high compressive residual stress in friction stir weld resulted in better SCC resistance compared to that of fusion weldment. It is brought out from the present study that FSW process can be used as an alternative to fusion welding process for better SCC resistance. (C) 2016 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.
机译：搅拌摩擦焊（FSW）是一种固态焊接工艺，通常用于焊接软质材料（如铝和镁合金）。在这项工作中，马氏体时效钢（一种超高强度钢）采用FSW工艺进行焊接。 FSW抑制了与熔焊马氏体时效钢相关的主要问题，即合金元素的偏析和奥氏体的形成。通过气体钨极电弧焊（GTAW）和FSW在空气和3.5％NaCl溶液中研究了18％Ni马氏体时效钢（250级）及其焊接件的慢应变速率应力腐蚀特性。观察到，与贱金属和气体钨极电弧焊件相比，FSW接头表现出更高的抗应力腐蚀开裂性（SCC）。搅拌摩擦焊件改进的抗应力腐蚀性能与微观结构差异和残余应力有关。相较于熔焊，细晶粒组织，合金元素无偏析和搅拌摩擦焊中较高的压缩残余应力导致更好的抗SCC性能。从本研究中可以看出，FSW工艺可以用作熔焊工艺的替代方法，以获得更好的耐SCC性能。 （C）2016年制造工程师学会。由Elsevier Ltd.出版。保留所有权利。

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