摘要
采用真空熔炼、1150℃均匀化退火、1000℃热轧、950℃退火等工艺制备含质量分数0.20%铌的446铁素体不锈钢,研究了热轧变形量(20%,40%,60%)对试验钢组织和耐铝液腐蚀性能的影响。结果表明:随着热轧变形量的增加,试验钢的晶粒尺寸明显细化,析出相析出位置由晶界转变为晶界和晶内,小角度晶界含量先增后减,当热轧变形量为40%时,小角度晶界占比最高,为27.2%。20%热轧变形量下的析出相主要为TiN和(Ti,Nb)C,40%和60%热轧变形量下主要为(Ti,Nb)(C,N)、(Ti,Nb)C和Fe_(2)Nb,60%热轧变形量下Fe_(2)Nb相的含量更多。随着热轧变形量的增加,770℃铝液中浸蚀1 h后试验钢表面形成的金属间化合物层厚度先减小后增大,40%热轧变形量下的厚度最小,为54.04μm,同时金属间化合物层中存在弥散分布的(Ti,Nb)C析出相,此时试验钢具有最优异的耐铝液腐蚀性能。
446 ferritic stainless steel containing 0.20wt%Nb was prepared by vacuum melting,homogenization annealing at 1150℃,hot rolling at 1000℃and annealing at 950℃.The effect of hot rolling deformation(20%,40%,60%)on microstructure and molten aluminum corrosion resistance was investigated.The results show that with increasing hot rolling deformation,the grain size of the test steel was significantly refined,the location of the precipitates changed from grain boundaries to grain boundaries and within grains,and the content of low-angle grain boundaries first increased and then decreased.When the hot rolling deformation was 40%,the proportion of low-angle grain boundaries was the highest,reaching 27.2%.The precipitates was mainly composed of TiN and(Ti,Nb)C at 20%hot rolling deformation,and was mainly of(Ti,Nb)(C,N),(Ti,Nb)C and Fe_(2)Nb at 40%and 60%hot rolling deformation.The content of Fe_(2)Nb phase at 60%hot rolling deformation was higher than that at 40%hot rolling deformation.With the increase of hot rolling deformation,the thickness of the intermetallic compound layer formed on surface of the test steel after etching in molten aluminum at 770℃for 1 h first decreased and then increased.When the hot rolling deformation was 40%,the thickness of the intermetallic compound layer was the smallest,which was 54.04μm,and there were dispersed(Ti,Nb)C precipitates in the intermetallic compound layer;the test steel had the most excellent resistance to molten aluminum corrosion.
作者
宋佳敏
廖劲成
杨弋涛
SONG Jiamin;LIAO Jincheng;YANG Yitao(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)
出处
《机械工程材料》
北大核心
2025年第9期24-29,37,共7页
Materials For Mechanical Engineering
关键词
含铌铁素体不锈钢
热轧变形量
显微组织
耐铝液腐蚀性能
Nb-containing ferritic stainless steel
hot rolling deformation
microstructure
molten aluminum corrosion resistance
作者简介
宋佳敏(2000-),女,江苏常州人,硕士研究生;通信作者:杨弋涛,导师,教授。
