细化NV颗粒尺寸对提高SAE6140钢强韧性的研究

Study on Improving the Strength and Toughness of SAE6140 Steel by Refining the Particle Size of NV

采用转炉冶炼SAE6140合结钢,根据钢中V含量添加微量的N元素,使N含量达到设计目标,可有效提高钢材强韧性、降低生产成本、还减少后续热处理工序。结果表明:钢中[V]设计为0.10%~0.15%,添加氮[N]含量在0.0070%~0.0100%,再利用控轧控冷工艺控制VN颗粒尺寸:20~100 nm占80%,可将屈服强度Rel提高80~170 MPa、延伸率A提高3%~5%、冲击功AKu2提高10~20 J。

The converter was used to smelting SAE6140 composite steel. According to the V content in the steel, trace N elements were added to make the N content reach the design goal, effectively improving the strength and toughness of steel, reducing the production cost and reducing the subsequent heat-treatment process. The results show that the content of vanadium [V] is 0.10%~0.15%, the content of nitrogen [N] is 0.0070%~0.0100%;then the controlled rolling and controlled cooling process is used to control the VN particle size: 20~100 nm accounts for 80%. The yield strength Rel can be increased by 80~170 MPa, the elongation A after fracture can be increased by 3%~5%, and the impact energy AKu2 can be increased by 10~20 J.