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在室温下,采用90°模具对工业纯钛(CP-Ti)进行多道次等径弯曲通道变形(ECAP),将每个道次变形后的试样横截面抛光后进行显微硬度的测量,并利用这些结果来绘制曲线图和等高线图,分析各道次的硬度变化以及横截面硬度分布规律。研究结果表明:工业纯钛经单道次ECAP变形后,虽然在靠近试样下表面处存在硬度较小的部分,但平均硬度显著提高,而在随后的挤压道次中硬度提高的趋势越来越小。并且经过ECAP单道次挤压后,试样中心硬度值高于试样上下表面硬度值。随着挤压道次的增加,靠近试样下表面硬度较低的区域逐渐消失,试样横截面的硬度分布越来越均匀。在4道次挤压后,试样上、下表面的硬度值稍高于试样中间的硬度值,这也说明通过ECAP多道次的加工可以使试样达到更高的硬度和更加均匀的硬度分布。
At room temperature, a multi-pass equal-pass bending deformation (ECAP) of industrial pure titanium (CP-Ti) was carried out using a 90 ° mold, and the microhardness was measured after the cross-section of each pass deformed specimen was polished , And use these results to draw the curve and contour map, analyze the change of hardness and the distribution of cross-section hardness. The results show that the average hardness of industrial pure titanium increases significantly after single-pass ECAP deformation, although the hardness is lower near the lower surface of the sample, while the hardness tends to increase in the subsequent extrusion pass The smaller it is. And after ECAP single-pass extrusion, the sample center hardness value higher than the upper and lower surface hardness value. With the increase of extrusion pass, the area with lower hardness near the lower surface gradually disappears, and the hardness distribution in the cross section of the sample is more and more uniform. After 4 passes, the hardness of the upper and lower surfaces of the sample is slightly higher than the hardness value of the middle of the sample, which also shows that the multi-pass processing of the ECAP can make the sample achieve higher hardness and more uniform Hardness distribution.