摘要
通过对一种含Cu低碳Mn-Nb-Mo-B微合金钢进行的变形与冷却试验,研究了一种屈服强度达到800 MPa级的贝氏体钢。利用EBSD技术对钢的微细组织结构和析出物形貌进行了分析。研究结果指出:贝氏体的细化和微细析出物对屈服强度800 MPa级高强钢的强韧性起决定性作用。焊接性试验表明,研究钢种具有较低的冷裂纹敏感性,在0℃环境进行的焊接裂纹率为零。
Through deforming and cooling test on a copper-containing Mn-Nb-Mo-B microalloyed steel, a bainitic steel with yield strength up to 800 MPa was investigated. The refined microstructure and morphology of precipitates were studied by means of the EBSD technique. Results show that the steel＇ s bainitic microstructure refinement and fine precipitates play a decisive role in toughness of the high strength steel with yield strength up to 800 MPa. In addition, the weldability suggests that the test steel has a lower susceptibility to cold cracks and zero welding crack rate at 0℃.
出处
《宝钢技术》
CAS
2007年第2期22-25,共4页
Baosteel Technology
关键词
低碳贝氏体钢
组织细化
力学性能
焊接性
low-carbon bainitic steel
microstructure refinement
mechanical property
weldability
