摘要
通过扫描电镜和X射线衍射仪对QPQ(淬火-抛光-淬火)盐浴复合处理后Ti6Al4V钛合金的显微组织和相组成进行分析,采用正交试验法研究共渗时间、共渗温度、氧化时间和氧化温度等4个参数对钛合金耐磨性的影响,并与盐浴氮碳共渗钛合金试样进行对比。结果表明:QPQ盐浴复合处理后,Ti6Al4V钛合金表面形成的渗层由表面至内部依次为氧化层、化合物层、扩散层;当钛合金在610℃共渗1.5h,400℃氧化40min时,其平均磨损量最小,为1.11mg,比氮碳共渗试样的降低了38.3%;当钛合金在580℃共渗3.5h,400℃氧化40 min时,其平均摩擦因数最小,为0.246 7,比氮碳共渗试样的降低了21.8%;经过优化的QPQ盐浴复合处理后,钛合金的耐磨性得到明显提高。
The microstructure and phase composition of Ti6Al4V titanium alloy after QPQ （quenching polishing-quenching） complex salt bath treatment were analyzed by scanning electron microscope and X-ray diffractometer. The effect of carbonitriding time, carbonitriding temperature, oxidation time and oxidation temperature on wear resistance of the titanium alloy was studied by using orthogonal test and compared with titanium alloy samples treated with salt bath nitrocarburizing. The results show that after QPQ complex salt bath treatment, a permeation layer formed on the surface of Ti6A14V titanium alloy. There were oxidation layer, compound layer and diffusion layer from the surface to the interior of the permeation layer. When the titanium alloy was carbonitrided at 610 ℃ for 1.5 h and oxidated at 400 ℃ for 40 min, the average wear amount of titanium alloy was the minimum, which was 1.11 mg and reduced by 38.3% of the carbonitriding sample. When the titanium alloy was carbonitrided at 580 ℃ for 3.5 h and oxidated at 4,00 ℃ for 40 min, the average friction coefficient was the minimum, which was 0.246 7 and reduced by 21.8% of the carbonitriding sample. The wear resistance of titanium alloy treated by optimized QPQ complex salt bath treatment was improved obviously.
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第2期64-68,共5页
Materials For Mechanical Engineering
关键词
QPQ盐浴复合处理
显微组织
耐磨性
摩擦因数
QPQ complex salt bath treatment
microstructure
wear resistance
friction coefficient
