利用扫描电镜及能谱分析研究了16Mn钢中Sb的析出行为,利用光学显微镜观察钢的显微组织。结果表明：16Mn钢中Sb的析出位置主要有两种：一是沿原奥氏体晶界析出;二是在MnS夹杂物上富集析出。Sb在MnS夹杂物上的富集析出,能促进钢中晶内铁素体的形成。适当提高S含量,降低O含量,加入Ti变质钢中MnS夹杂等方式,能增加Sb在夹杂物上富集析出,促进了晶内铁素体,尤其是晶内针状铁素体形成,减少了Sb的晶界析出。
Antimony precipitation behavior in 16Mn steel was investigated by SEM,and microstructure of the steel was observed by OM.The results show that there are two ways of antimony precipitation in 16Mn steel.One is antimony precipitation at grain boundaries,another is antimony precipitation on manganese sulfide inclusions.Antimony precipitation on manganese sulfide inclusions is beneficial to the nucleation of intragranular acicular ferrite.Increasing the sulfide content,reducing the oxygen content and modifying MnS inclusions by adding Ti in 16Mn steel can increase antimony precipitation on manganese sulfide inclusions,enhance the effect of antimony on the nucleation of intragranular ferrite,especially the nucleation of intragranular acicular ferrite and reduce antimony-enriched phases precipitated at grain boundaries.
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