摘要
对一种含铜超低碳Mn-Nb-B系微合金钢进行TMCP工艺,得到屈服强度达850 MPa的超低碳贝氏体钢。采用光学显微镜和扫描电子显微镜对试验钢不同板厚处的组织进行观察与分析,通过透射电子显微镜分析试验钢板条贝氏体间析出物,结果表明,屈服强度850 MPa超低碳贝氏体钢组织主要为细小的板条贝氏体,沿板厚方向上贝氏体板条宽度变化不大,板条长度从表层到心部逐渐增大。贝氏体板条的细化和微细析出物的形态、大小及分布对试验钢的强韧性起决定作用。
Ultra low carbon bainite steel with yield strength up to 850 MPa is gained through TMCP treatment on the copper-containing Mn-Nb-B micro-alloyed steel.The microstructures with different distances from the face are investigated by means of the optical microscope and scanning electron microscope（SEM）.The precipitates in the lath bainite are described through the transmission electron microscopy（TEM）.The results show that the microstructure of the ULCB steel with yield strength up to 850 MPa is mainly composed of fine lath bainite.Along the thickness of the steel plate,the width of the lath bainite does not present obvious change,but the length increases from the surface to the center.The lath bainitic microstructure refinement and fine precipitates play a decisive role in the experimental steel.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2011年第7期39-42,72,共5页
Nonferrous Metals（Extractive Metallurgy)
关键词
金属材料
超低碳贝氏体钢
板条贝氏体
细晶强化
析出强化
metal material
ultra low carbon bainitic steel
lath bainite
fine-grained strengthening
precipitation strengthening
