过共析钢线材组织与性能的控制

Control of microstructures and properties of hypereutectoid steel wire rods

采用热/力物理模拟和微观分析相结合的方法研究了过共析钢在连续冷却过程中的固态相变和热加工工艺对钢的组织性能影响,结果表明,变形温度降低120℃,引起相变温度升高22℃;冷却速度提高到15℃/s,使得相变温度下降了90℃;提高变形温度有利于增加抗拉强度,但断面收缩率呈现下降趋势。试验结果用于生产过程优化和控制,使线材的合格率达到95%以上。

The effects of solid-state phase transformation and hot working procedure on the microstructures and properties of hypereutectoid steel were investigated by means of thermal-mechanical simulation method combined with micro-analysis. Experimental results show that the transformation temperature increases with the decrease of deformation temperature. When the cooling rate is accelerated, the transformation temperature decreases. The increase of deformation temperature facilitates to enhance the tensile strength of hypereuteetoid steel, but brings about lowering the shrinkage percentage of cross section. These results have been applied to the control and optimization of production process. As a result, the wire rods of hypereutectoid steel has reached a percent of pass above 95 %.