合金元素对Q460耐火钢连续冷却转变曲线的影响  

Effect of alloy elements on continuous cooling transformation curve of Q460 fire-resistant steel

作　　者：赵鸿金[1] 周军[1] 齐亮[1] 杨正斌[1] 邱春根 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《金属热处理》2016年第4期96-99,共4页Heat Treatment of Metals

基　　金：江西省教育厅科技项目(GJJ14446);江西省大学生创新创业训练项目(201310407026);江西理工大学科研基金(NSFJ2014-K03)

摘　　要：采用热膨胀法研究了Mo、B、V对Q460耐火钢静态CCT曲线的影响,通过观察不同冷速下的显微组织变化确定各个相变区间及转变规律。结果表明,3种耐火钢的相变规律基本一致。随冷却速度的提高,发生准多边形铁素体→粒状贝氏体→板条贝氏体→马氏体的转变。但含B系耐火钢由于含B钢的强淬透性,扩展了贝氏体转变区间,低冷速下就能够获得贝氏体组织。高Mo系和V系耐火钢的相变规律比较相似,但在不同的冷速时存在差别。This experiment was adopted thermal expansion method to determine the static CCT curves of Mo,B,V three kinds of alloy elements of Q460 fire-resistant steel,and microstructure changes under different cooling rate to determine each phase transition and transformation rules. The results show that the basic transformation rules of the three kind of fire-resistant steel are consistent. With the cooling rate increasing,the quasi polygonal ferrite,granular bainite,lath bainite,martensite transformation achieved in order. But the high hardenability of B alloyed steel,lead to B fire-resistant steel expanding the bainite transition region,and this also make bainite transformation easier under the low cooling speed. The law of transformation of fire-resistant steel with high Mo element and V element is quite similar,but they are some differences under different cooling rates.

关 键 词：Q460耐火钢 静态CCT曲线 冷却速度 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]