摘要
采用低碳Nb、Ti微合金化成分体系和控轧控冷工艺开发650 MPa级高强度车轮轮辋用钢,重点围绕材料经焊接热循环后的力学性能、金相组织以及Nb、Ti碳氮化物的析出与溶解的变化进行了研究。得出结论,材料基体析出物越细小,位错密度越大,热影响区强度相比基体和焊缝降幅越大,当其低于轮辋扩径整形过程材料协调形变力时,导致热影响区开裂或缩颈质量缺陷的发生。
The 650 MPa grade high strength wheel rim steel is developed with the low carbon Nb-Ti microalloying component system as well as controlled rolling and cooling process.The changes of mechanical properties and metallographic structure of materials after weld thermal cycle as well as the precipitation and dissolution of Nb and Ti carbonitrides are mainly studied.It is concluded that the finer the precipitates of material matrix,the greater the dislocation density and the greater the decrease of strength of heat affected zone compared with the matrix and weld joint.When it is lower than the coordinated deformation force of material in the process of hole enlargement and shaping for rim,the cracking of the heat affected zone or the quality defect of necking is occured.
作者
刘妍
宿成
张智刚
刘德勤
Liu Yan;Su Cheng;Zhang Zhi-gang;Liu De-qin(Inner Mongolia Baotou Steel Rare Earth Steel Plate Co.,Ltd.,Baotou 014040,Inner Mongolia,China)
出处
《包钢科技》
2021年第5期53-57,共5页
Science & Technology of Baotou Steel
关键词
高强车轮钢
焊接热影响区
显微组织
开裂
high strength wheel steel
heat affected zone
microstructure
cracking
