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首页> 外文期刊>Proceedings of the institution of mechanical engineers >The effect of single and double austenitization temperatures on the microstructure, mechanical properties, and pitting corrosion of AISI 431 electron beam welds
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The effect of single and double austenitization temperatures on the microstructure, mechanical properties, and pitting corrosion of AISI 431 electron beam welds

机译：单双奥氏体化温度对AISI 431电子束焊缝的组织，力学性能和点蚀的影响

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摘要

The relative effects of single austenitization (SA) and double austenitization (DA) temperatures on the microstructure, mechanical properties, and pitting corrosion of electron beam welds of AISI 431 martensitic stainless steel were studied. The post weld heat treatments consist of austenitizing the weld samples for 1 h at 1000 and 1050 ℃ and double austenitizing at 1050 and 1000 ℃ and air cooling followed by double tempering, i.e. tempering at both 670 and 600 ℃. The prior austenite grain size increased with an increase in austenitizing temperature from 1000 to 1050 ℃. Grain refinement resulted after DA. Parent metal grain size was coarser as compared to grain size in the weld zone in the respective conditions. Retained austenite content increased after DA. Undissolved carbides were observed in welds and parent metal austenitized up to 1000 ℃ and they dissolved at austenitizing temperature ≥1050 ℃. DA treatment resulted in the dissolution of most of the carbides. Coarsening of martensite laths was observed after tempering. DA after double tempering resulted in optimum mechanical properties, i.e. strength, hardness, and toughness. The pitting resistance of the DA-treated samples showed a considerable improvement over those obtained by either of the two SA treatments followed by double tempered conditions.
机译：研究了单奥氏体化（SA）和双奥氏体化（DA）温度对AISI 431马氏体不锈钢的电子束焊缝的组织，力学性能和点蚀的影响。焊后热处理包括在1000和1050℃对焊缝样品进行1小时的奥氏体化，在1050和1000℃对焊缝进行两次奥氏体化，然后进行空气冷却，然后进行双重回火，即在670和600℃进行回火。随着奥氏体化温度从1000℃升高到1050℃，原始奥氏体晶粒尺寸增加。 DA后晶粒细化。与在各种条件下的焊接区域中的晶粒尺寸相比，母体金属晶粒尺寸更粗。 DA后残留奥氏体含量增加。在焊缝中观察到未溶解的碳化物，母体金属在奥氏体化温度高达1000℃时溶解，在奥氏体化温度≥1050℃时溶解。 DA处理导致大多数碳化物溶解。回火后观察到马氏体板条的粗化。二次回火后的DA可获得最佳的机械性能，即强度，硬度和韧性。经过DA处理的样品的抗点蚀性能比通过两次SA处理以及随后的双回火条件获得的抗点蚀性能有了显着提高。

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