Effects of Warm Rolling on the Microstructure and Mechanical Properties of Low-Cr FeCrAl Alloys at Room and Elevated Temperatures  

温轧对低铬FeCrAl合金显微组织及室温和高温力学性能的影响

作　　者：CHEN Gangming WANG Hui HUANG Xuefei 陈港明;王辉;黄雪飞(四川大学材料科学与工程学院,成都610065)

机构地区：[1]College of Materials Science and Engineering,Sichuan University,Chengdu 610065,China

出　　处：《材料导报》2025年第9期178-188,共11页Materials Reports

基　　金：国家自然科学基金(52122103);中国核动力院-四川大学联合创新基金(SCU&NPIC-LHCX-32)。

摘　　要：The effects of different warm rolling(WR)reductions on the microstructure and mechanical properties of low-Cr FeCrAl alloys at both room and elevated temperatures were investigated.The study revealed that when the WR reduction is small,it effectively refines the grains and forms a large number of subgrains in the matrix,while also inducing the dissolution of the Laves phase.This enhances the mechanical properties of FeCrAl alloys primarily through grain refinement and solid solution strengthening.Conversely,with larger WR reductions,the grain refinement effect diminishes,but a significant number of Laves phases form in the matrix,strengthening the alloys primarily through precipitation strengthening.WR exhibited a remarkable enhancing effect on the comprehensive mechanical properties at both room and high temperatures,with a signi-ficant enhancement in ductility at high temperatures.Notably,a 10%WR reduction resulted in the optimal overall mechanical properties at both room and elevated temperatures.FeCrAl合金是一种极具潜力的耐事故燃料(ATF)包壳材料,但其目前的组织和性能还尚未能满足ATF包壳的需求,本工作研究了不同温轧变形量对低铬FeCrAl合金显微组织和室温、高温下力学性能的影响,试图通过优化温轧工艺来获得组织和性能更加优异的FeCrAl合金。结果表明,当温轧变形量较小时,可以有效地细化晶粒,并在基体中形成大量的亚晶,同时还会诱导Laves相的溶解。此时的强化机制主要是细晶强化和固溶强化。然而,当温轧变形量较大时,晶粒细化效果会减弱,但基体中会形成大量的Laves相。此时的强化机制主要是析出强化。此外,温轧在室温和高温下对FeCrAl合金的综合力学性能表现出显著的增强效果,特别是显著提高了高温下的塑性。同时还发现,10%温轧变形量的试样可以在室温和高温下获得最佳的综合力学性能。

关 键 词：FeCrAl alloy low-Cr warm rolling Laves phases mechanical property 

分 类 号：TG142[一般工业技术—材料科学与工程]