挤压锻温度对固态再生H11钢组织和性能的影响

以回收的H11钢车削屑获得的粉末为原料， 利用粉末压坯和挤压锻工艺制备样品， 并结合拉伸实验、硬度测试、XRD，SEM，TEM等分析手段， 研究了1100~1220℃不同挤压锻温度对固态再生H11钢组织结构和力学性能的影响. 结果表明:样品固结效果良好；挤压锻温度为1220℃时， 材料密度可达95.8 %；挤压锻温度达到1140℃后，基体中析出Fe₇C₃相； 随着挤压锻温度从1100℃升高至1220℃， 沿挤压方向的硬度从2.5GPa增加至4.4GPa， 抗拉强度从451MPa增加至808MPa， 但延伸率从3.1 %降低至0.7 %.

Effect of Extrusion-Forging Temperature on Microstructure and Mechanical Properties of Solid State Regenerated H11 Steel

Using the powders from the recovered machining chips of H11 steel as raw materials， the samples were prepared by powder compacting and extrusion-forging processes. Using tensile test， hardness test， XRD， SEM， TEM and etc.， the effects of different extrusion-forging temperatures in a range of 1100~1220℃ on the microstructure and mechanical properties of solid regenerated H11 steel were studied. The results show that the sample has a good consolidation effect. When the extrusion-forging temperature is 1220℃， the density of the sample can reach up to 95.8%. After the temperature is over 1140℃， the Fe₇C₃ phase precipitates in the matrix. With increasing extrusion-forging temperature from 1100℃ to 1220℃， the hardness along the extrusion direction increases from 2.5GPa to 4.4GPa and the tensile strength increases from 451MPa to 808MPa， while the elongation decreases from 3.1% to 0.7%.