摘要
采用X射线衍射,计算了高硅铸钢等温淬火热处理后的贝氏体铁素体含碳量,采用TEM分析了贝氏体铁素体中的位错,研究了贝氏体铁素体板条尺寸与高硅铸钢屈服强度、硬度间的关系。在此基础上分析了高硅铸钢的强化以及韧化机理:高硅铸钢的强化是固溶强化、位错强化和细晶强化综合作用的结果;而高硅铸钢的韧化是存在于贝氏体铁素体板条之间富碳的薄膜状残余奥氏体、细小的贝氏体铁素体板条共同作用的结果。合适的Si含量也是影响高硅铸钢韧性重要因素。
The carbon content of bainitic ferrite in the austempered high silicon cast steel after various austempering combinations is investigated by XRD method. The morphology of dislocation in the bainitic ferrite is observed by TEM. And the influences of mean particle size bainitic ferrite on the yield strength and hardness of the steel are studied. Hereby, the mechanisms of strengthening and tougheding of austempered high silicon cast steel is analyzed. The strengthening of the steel is resulted from the solid solution strengthening, dislocation strengthening and fine-grain strengthening, and the toughening is due to the finer bainitic ferrite laths and film shaped retained austenite between bainitic ferrite laths. An appropriate Si amount is also a positive factor on the toughness of austempered high silicon cast steel.
出处
《铸造》
EI
CAS
CSCD
北大核心
2006年第12期1239-1243,共5页
Foundry
关键词
高硅铸钢
等温淬火
强韧化
high silicon cast steel
austempering treatment
strengthening and toughening
