钼含量对含铌微合金钢组织的影响  

Effect of Molybdenum Contents on Microstructure of Niobium-containing Micro-alloy Steel

作　　者：程汉 熊辉辉[1] 张恒华[1] CHENG Han;XIONG Huihui;ZHANG Henghua(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学材料科学与工程学院

出　　处：《上海金属》2019年第5期42-46,52,共6页Shanghai Metals

摘　　要：制备了不含钼和含0.15%、0.22%Mo(质量分数)的含铌微合金钢。对3种钢进行了700℃保温5、60和120 min的等温退火。随后采用OM、SEM、EBSD、TEM、EDS等检测了钢的显微组织和析出相的成分,以了解钼含量和等温退火时间对含铌微合金钢显微组织的影响。结果表明:钼的添加使含铌微合金钢的铁素体更加细小,使钢中析出相的分布也更加弥散。随着等温退火时间从5 min延长至120 min,铌钢和铌钼钢中铁素体晶粒均长大,但钼的添加能抑制铁素体晶粒的粗化,因此铌钼钢的铁素体晶粒长大并不显著。Three categories of niobium-containing micro-alloy steels,not containing molybdenum and containing 0.15%and 0.22%molybdenum by mass,were fabricated.These steels were isothermally annealed at 700℃for 5 min,60 min and 120 min,and then were tested for microstructures and compositions of precipitated phase by means of OM,SEM,EBSD,TEM,and EDS,to identify the effects of both molybdenum content and duration time of isothermal annealing on microstructure of the steels.The results showed that addition of molybdenum allowed the ferrite to become finer,and distribution of the precipitated phases to become more disperse.Moreover,as duration of isothermal annealing increased from 5 min to 120 min,the niobium steel and niobium-molybdenum steels all exhibited grown ferrite grains.The addition of molybdenum,however,could effectively suppress ferrite grain coarsening,therefore the growth of ferrite grains in the niobium-molybdenum steels was not clear.

关 键 词：含铌微合金钢 钼 微观组织 析出相 

分 类 号：TG1[金属学及工艺—金属学]