双相钛合金表面等离子渗铬强化层疲劳行为研究  

STUDY ON FATIGUE BEHAVIOR OF PLASMA CHROMIZING STRENGTHENING LAYER ON BIPHASIC TITANIUM ALLOY

作　　者：阮铭业 彭晓君 庄丰嘉 朱先勇 RUAN MingYe;PENG XiaoJun;ZHUANG FengJia;ZHU XianYong(College of Mechanical and Automotive Engineering,Zhaoqing College,Zhaoqing 526061,China)

机构地区：[1]肇庆学院机械与汽车工程学院,肇庆526061

出　　处：《机械强度》2021年第2期442-446,共5页Journal of Mechanical Strength

基　　金：教育部产学合作协同育人项目(201801086044)资助。

摘　　要：为改善钛合金的耐磨性,使用真空辉光等离子体表面合金化技术,对双相钛合金TC4样品进行了等离子体铬化处理。通过纳米压痕对试样的局部硬度和模量进行了测定,并在给定载荷下利用旋转弯曲疲劳机对试样的疲劳性能进行评估。结果表明:850℃下渗铬处理5h后获得的铬合金层由四个子层组成,即Cr沉积层,TiCr_(2)层,Ti_(4)Cr层和Cr-Ti固溶层;相邻子层的弹性模量和硬度有显著差异,而等离子渗铬处理使TC4钛合金的疲劳性能变差;通过喷丸后处理可以增加等离子体铬化样品的疲劳寿命,这归因于该样品具有最高的残余压应力,显著的加工硬化以及良好的硬度与韧性平衡。In order to improve the wear resistance of titanium alloy,the plasma chromizing treatment of the duplex TC4 sample was carried out by vacuum glow plasma surface alloying technology. The local hardness and modulus of the sample were tested by nanoindentation. The fatigue properties of the specimens were evaluated by a rotary bending fatigue machine under a given load. The results show that the chromium alloy layer obtained after 5 hours of 850 ℃ treatment is composed of four sublayers,namely the Cr deposit layer,TiCr_(2) layer,Ti_(4)Cr layer and Cr-Ti solid solution layer. The elastic modulus and hardness of the adjacent sub-layers are significantly different,while the plasma chromizing treatment deteriorates the fatigue properties of the TC4 titanium alloy,and the fatigue life of the plasma chrome-plated sample can be increased by shot peening,which is attributed to The sample has the highest residual compressive stress,significant work hardening and a good balance of hardness and toughness.

关 键 词：等离子渗铬 喷丸强化 钛合金 疲劳行为 

分 类 号：TG178[金属学及工艺—金属表面处理]