摘要
利用SEM、TEM研究了同一成分的热轧双相钢的马氏体体积分数对形变位错结构和断口组织特征的影响。结果表明,马氏体体积分数为20%~30%时,体积分数增加对双相钢形变位错结构的演变影响较小。且马氏体在变形的后期中将出现伴生的高位错密度区和低位错密度区。断裂时当马氏体体积分数增加到30%,颈缩提前,且微孔有向微裂纹转变的趋势。因此,马氏体体积分数为20%的双相钢的成形性能优于马氏体体积分数为30%的双相钢。
Effect of martensite volume fraction on deformation
dislocation structure and fracture for hot rolled dual-phase steel of the same
composition was studied by using SEM and TEM.The results show that effect
of martensite volume fraction on deformation dislocation structure of DP steel
is little when martensite volume fraction is between 20% and 30%.And
martensite would appear both region of high dislocation density and region of
low dislocation density after deformation.Furthermore,the micropore in DP
steel would change into microcrack when martensite volume fraction reached
30%.Meanwhile necking appeared early.So when martensite volume fraction
was 20%,forming property of DP steel was better than the DP steel whose
martensite volume fraction was 30%.
出处
《钢铁》
CAS
CSCD
北大核心
2009年第8期89-92,共4页
Iron and Steel
关键词
热轧双相钢
马氏体体积分数
形变位错结构
断裂
hot rolled dual phase steel
martensite volume fraction
deformation dislocation structure
fracture
