挤压锻温度对固态再生 H11 钢组织和性能的影响.

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%. [ABSTRACT FROM AUTHOR]