影响含B低碳贝氏体钢冲击韧性的规律研究  

STUDY ON REGULARITY OF IMPACT DUCTILITY OF LOW-CARBON BAINITIC STEEL WITH BORON

作　　者：韦弦[1] 

机构地区：[1]安阳钢铁集团有限责任公司

出　　处：《河南冶金》2012年第4期12-16,共5页Henan Metallurgy

摘　　要：对影响含硼低碳贝氏体钢冲击韧性的因素进行了对比试验和分析,总结了含硼低碳贝氏体钢冲击韧性的规律。认为影响含硼低碳贝氏体钢冲击韧性的主要原因是有效晶界与质点控制,从而通过细化轧制奥氏体获得有效晶界,通过控轧控冷来控制相变,获得不同类型的中温转变组织分割奥氏体。利用准多边形铁素体、位向不同的板条束、和粒贝等组织有效改善冲击韧性,获得良好的强韧性匹配。同时微合金元素的合理使用与钢水纯净度的控制是获得良好韧性的前提。The regularity on impact ductility of low - carbon bainitic steel is summarized through the analysis and cont- rastive tests on influence factors of impact ductility of low - carbon bainitic steel with boron. It is found that the main influ- ence factors are effective grain boundary and particles control. Various intermediate transition structures will refine austenite by means of effective grain boundary from refining austenite and phase transformation from controlling rolling and cooling. Structures like quasi - polygonal ferrite,lath - like bainite with different orientations and granular bainite can effectively im- prove the impact ductility, so good strength - ductility matching can be achieved. Optimum utilization of microalloying ele- ments and good control of the purity of molten steel are the precondition for excellent ductility.

关 键 词：低碳贝氏体 冲击韧性 显微组织 第二相 夹杂物 低温轧制 冷却速度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]