Microstructure and cryogenic mechanical properties of dissimilar friction stir welding joints between nitrogen-alloyed CoCrFeMnNi high-entropy alloy and high-manganese austenite steel
Jinghua Zhang, Hongyan Lv, Shuaifei Yan, Rui-dong Fu, Yi-jun Li
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引用次数: 0
Abstract
The microstructures and cryogenic mechanical properties of dissimilar friction stir welding (FSW) joints between nitrogen-alloyed CoCrFeMnNi high-entropy alloys (HEAs) and Fe–32.1Mn–7.5Cr–0.6Mo–1.2 N steel were investigated. The results reveal that defect-free dissimilar joints can be achieved through FSW. Furthermore, the grains of nitrogen-alloyed CoCrFeMnNi HEAs in the stir zone of the dissimilar joint are significantly more refined than those of Fe–32.1Mn–7.5Cr–0.6Mo–1.2 N steel. Joint efficiency at room and low temperature both exceed 90% of the base metal. Moreover, the cryogenic yield and ultimate strength of the dissimilar joints are higher than those recorded at room temperature. The fracture position is at the heat-affected zone of HEAs under two temperature conditions.
研究了氮合金钴铬铁镍高熵合金(HEAs)和铁-32.1Mn-7.5Cr-0.6Mo-1.2 N 钢之间异种搅拌摩擦焊(FSW)接头的微观结构和低温力学性能。结果表明,通过 FSW 可以实现无缺陷异种接头。此外,与 Fe-32.1Mn-7.5Cr-0.6Mo-1.2 N 钢相比,氮合金 CoCrFeMnNi HEAs 在异种接头搅拌区的晶粒明显更加细化。室温和低温下的接头效率均超过母材的 90%。此外,异种接头的低温屈服强度和极限强度均高于室温下的记录。在两种温度条件下,断裂位置都在 HEA 的热影响区。