TiN对高强度耐磨钢韧性的影响及其机制分析  

Effect of TiN on toughness of high-strength wear-resistant steel and its mechanism analysis

作　　者：王帅[1,2] 胡锋[1,2] 李德发 周雯[1,2] 吴开明[1,2] WANG Shuai;HU Feng;LI De-fa;ZHOU Wen;WU Kai-ming(Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;International Research Institute for Steel Technology,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学高性能钢铁材料及其应用省部共建协同创新中心,湖北武汉430081 [2]武汉科技大学国际钢铁研究院,湖北武汉430081

出　　处：《中国冶金》2021年第7期38-45,共8页China Metallurgy

基　　金：国家自然科学基金资助项目(51671149);湖北省自然科学基金资助项目(2016CFA004,T201903);武汉市科技局应用基础前沿专项资助项目(2019010701011382);111项目和武汉科技大学科发院重大科技资助项目(2018TDX07)。

摘　　要：采用SEM、EDS、TEM等技术,结合热力学软件,研究Ti含量对低合金耐磨钢低温冲击韧性的影响、断口夹杂物尺寸和形态以及夹杂物形态与冲击韧性的关系。结果表明,Ti元素质量分数为0.03%的低合金耐磨钢的低温(-40℃)冲击性能最好,可达33.0 J;断口夹杂物TiN的形态呈现3种形貌,即出现细窄裂纹、出现孔洞以及直接被撕裂;随着Ti含量的增加,夹杂物形态由完整到破碎。分析TiN的破碎机制发现,TiN破碎由2种机制产生,即裂纹扩展形成孔洞导致破碎、主裂纹衍生出更多的次裂纹导致破碎。SEM,EDS,TEM and other technologies combined with thermodynamic software were used to study the effect of Ti content on the low-temperature impact toughness of low-alloy wear-resistant steel,size and morphologies of fracture inclusions,and the relationship between morphologies of inclusions and impact toughness.The results showed that the low-alloy wear-resistant steel with a Ti mass fraction of 0.03%had the best low-temperature(-40℃)impact performance,which could reach 33.0J.The morphology of TiN inclusion in the fracture surface showed three types of morphologies,namely,narrow cracks,holes and tearing crack.With the increase of Ti con-tent,the morphology changed from intact to broken.Analysis of the breaking mechanism of TiN revealed that TiN breaking was caused by two mechanisms,namely,cracks propagated to form holes leading to breakage and the main cracks derived more secondary cracks and cause breaking.

关 键 词：低合金耐磨钢 低温冲击 夹杂物TiN 破碎机制 裂纹 

分 类 号：TG142.1[一般工业技术—材料科学与工程]