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用电子显微镜和自射线方法观察了0.12C、0.06C-0.2Si-1.0Mn-0.0013N-0.0013B 低碳钢在不同热处理条件下,硼的形态变化.热轧钢板中的氮化硼多以硫化锰为核心析出.也观察到了不含硫化锰核的单纯氮化硼.加热温度高于1000℃时,氮化硼分解,只剩下硫化锰,其后若在950℃保温时,硫化锰等夹杂物的界面上再次析出氮化硼.氧化铝也是氮化硼再析出的核心.在硫化锰和氧化铝等非金属夹杂物界面上,氮化硼的优先析出行为是我们初次确认的,由此可知降低钢中的硫和氧,减少其夹杂物含量,从而减少夹杂物界面上的无效硼,即使加入少量硼也可提高钢的淬透性,改善钢的加工性和可焊性.
The morphological changes of boron in 0.12C, 0.06C-0.2Si-1.0Mn-0.0013N-0.0013B mild steel under different heat treatment conditions were observed by means of electron microscope and self-radiography method.The boron nitride Manganese sulfide as the core precipitation also observed pure manganese nitride nuclei of boron nitride.When the heating temperature is higher than 1000 ℃, boron nitride decomposition, leaving only the manganese sulfide, then if the insulation at 950 ℃, manganese sulfide And other inclusions again precipitated boron nitride alumina is the core of boron nitride re-precipitation in manganese sulfide and alumina and other non-metallic inclusions interface, the preferential precipitation behavior of boron nitride is our first confirmed, This shows that the reduction of sulfur and oxygen in the steel to reduce the content of inclusions, thereby reducing the ineffective boron on the inclusion interface, even with a small amount of boron can also increase the hardenability of steel to improve the workability and weldability of steel.