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首页> 外文期刊>Materiali in Tehnologije >EFFECT OF HEAT TREATMENT ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF MARTENSITIC STAINLESS-STEEL JOINTS WELDED WITH AUSTENITIC STAINLESS-STEEL FILLERS
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EFFECT OF HEAT TREATMENT ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF MARTENSITIC STAINLESS-STEEL JOINTS WELDED WITH AUSTENITIC STAINLESS-STEEL FILLERS

机译：热处理对焊接奥氏体不锈钢填料的马氏体不锈钢接头组织和力学性能的影响

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摘要

AISI 422 martensitic stainless steels were welded according to the ISO 15792-1 standard with austenitic stainless-steel filler. The effects of tempering and preheating heat treatments were also evaluated. The microstructures of the welds were characterized with optical microscopy. Mechanical properties were determined via microhardness, tensile and fatigue tests, and compared to those of the unwelded AISI 422 steel. X-ray diffraction was used to characterize the phases present in the weld. Chromium carbides were observed at the grain boundaries of the welds. The precipitation was caused mainly by the diffusion of carbon into the austenitic stainless steel during the welding. The microhardness decreased from the base metal to the weld. The tensile-strength and percent-elongation values were improved with preheating and tempering heat treatments. The highest fatigue limit was obtained with preheating.
机译：AISI 422马氏体不锈钢根据ISO 15792-1标准与奥氏体不锈钢填料焊接在一起。还评估了回火和预热热处理的效果。用光学显微镜对焊缝的微观结构进行了表征。机械性能是通过显微硬度，拉伸和疲劳测试确定的，并与未焊接的AISI 422钢进行了比较。 X射线衍射用于表征焊缝中存在的相。在焊缝的晶界处观察到碳化铬。沉淀主要是由于焊接过程中碳向奥氏体不锈钢中的扩散所致。从母材到焊缝的显微硬度均降低。通过预热和回火热处理可以提高抗拉强度和延伸率百分比。通过预热获得了最高的疲劳极限。

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