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采用陶瓷湿喷丸强化技术对TC4合金进行表面改性处理,研究湿喷丸强度对钛合金表面状态及拉拉疲劳寿命的影响规律。结果表明,湿喷丸强化在材料表面引入残余压应力场,随喷丸强度增加残余压应力层变深。喷丸强度为0.1~0.2 mm N时,材料表面机加工痕迹得到有效去除,且表面粗糙度降低。湿喷丸强化后,材料表层位错密度增加,晶粒细化。湿喷丸强化能够明显改善TC4合金疲劳性能,改善效果和喷丸强度间不是单调关系,即存在最优喷丸工艺参数。在喷丸强度0.3 mm N条件下,疲劳寿命是基材的1.93倍,改善效果最明显。
The surface modification of TC4 alloy was carried out with ceramic wet shot peening technology to study the influence of wet shot peening on the surface condition and tensile fatigue life of titanium alloy. The results show that the wet shot peening introduces a residual compressive stress field on the surface of the material, and the residual compressive stress layer becomes deeper as the shot peening strength increases. Shot peening intensity of 0.1 ~ 0.2 mm N, the material surface machining traces are effectively removed, and the surface roughness decreases. After wet shot peening, the surface dislocation density increases and the grains are refined. Wet shot peening can obviously improve the fatigue properties of TC4 alloy. The improvement effect and the shot peening strength are not monotonous, that is, the optimal peening process parameters exist. In shot peening strength of 0.3 mm N conditions, the fatigue life of 1.93 times the substrate, the most obvious improvement.