TC21钛合金稀土渗硼强化表面组织及性能

发布时间：2018-05-03 20:13

  本文选题：固体渗硼 + TC钛合金　； 参考：《航空学报》2015年05期

【摘要】：采用单体硼为供硼剂对TC21钛合金表面进行稀土催化表面强化热处理,对渗硼层组织形貌、硬度、磨痕形貌和磨损率进行了研究。结果表明单体硼渗剂中CeO2配比为7wt%左右的渗硼层连续致密,耐磨性较好;温度对于表层TiB2的厚度影响较大,提高温度可显著增大渗硼层厚度,随着保温时间的延长,表层TiB2层逐渐增厚并且更为连续,时间超过一定值后渗硼层厚度增加缓慢;渗硼层表层硬度随渗硼温度提高显著增大,随保温时间延长增加缓慢,渗硼温度在1 000℃时渗硼层近表层硬度可达3 200HV0.01左右,高硬度区域厚度可达20μm以上;TC21钛合金渗硼层表现出了良好的摩擦磨损性能,渗硼试样的比磨损率比未渗硼试样低50~60倍。
[Abstract]:Rare-earth catalytic surface hardening heat treatment was carried out on the surface of TC21 titanium alloy with monomeric boron as boron donor. The microstructure, hardness, wear scar morphology and wear rate of boronized layer were studied. The results show that the boronizing layer with CeO2 ratio of about 7 wt% is continuous dense and has good wear resistance, and the temperature has a great effect on the thickness of surface TiB2, and increasing the temperature can significantly increase the thickness of boronizing layer, with the prolongation of the holding time. The thickness of boronized layer increases slowly after the time exceeds a certain value, and the hardness of the surface layer increases significantly with the increase of boronizing temperature, and increases slowly with the prolongation of holding time. When the boronizing temperature is 1 000 鈩，

本文编号：1839921