發(fā)布時間：2018-07-07 13:49

  本文選題：激光沖擊微造型 + 鈦合金　； 參考：《江蘇科技大學》2017年碩士論文

【摘要】：鈦合金Ti13Nb13Zr具有良好的耐腐蝕性、生物相容性、彈性模量低等優(yōu)點,是人體骨骼替代的首選材料,然而耐磨性差,嚴重制約著鈦合金應用。為了提高鈦合金的耐磨性能,本課題采用激光沖擊微造型方法對醫(yī)用鈦合金Ti13Nb13Zr耐磨性能進行研究,主要工作如下:(1)基于單點激光微沖擊Ti13Nb13Zr實驗,研究工藝參數(shù)對鈦合金Ti13Nb13Zr表面沖擊變形及力學性能的影響。結果表明:隨著激光能量和沖擊次數(shù)的增加,凹坑的深度、納米硬度及彈性模量、微觀組織的影響層深度逐漸增大,但增幅減小;在凹坑中心處表層晶粒細化程度最大,隨著深度的增加,晶粒細化程度逐漸降低。(2)建立激光沖擊鈦合金Ti13Nb13Zr的數(shù)值模型,并結合實驗結果驗證數(shù)值模型的正確性;進行多點激光沖擊微造型數(shù)值模擬,研究激光能量、凹坑間距、凹坑位錯對表面形貌、殘余應力的影響,為后續(xù)微造型減摩耐磨機理提供支撐。(3)為了獲得工藝參數(shù)對摩擦系數(shù)、磨損量影響及最優(yōu)工藝參數(shù),基于Box-benhken實驗設計進行多點激光沖擊微造型表面摩擦系數(shù)、磨損量擬合分析。研究結果顯示:光斑直徑0.8 mm表面微造型摩擦系數(shù)和磨損質量隨著激光能量的增大而增大,而凹坑位錯從0 mm增大到0.4 mm,摩擦系數(shù)和磨損量逐漸減小;隨著凹坑間距的增大,磨損量及摩擦系數(shù)先減小后緩增,在間距1.5 mm左右摩擦系數(shù)和磨損量最小;對響應值優(yōu)化分析得出摩擦系數(shù)最小時激光能量、凹坑間距、凹坑位錯工藝參數(shù)為(1.2 J,1.5 mm,0.4 mm),磨損量最小時所對應的工藝參數(shù)為(1.2 J,1.49 mm,0.4 mm)。光斑直徑0.5 mm表面微造型摩擦系數(shù)和磨損量隨激光能量、凹坑位錯的增大而減小,隨著凹坑間距的增大先減小后增大;對響應值進行優(yōu)化分析得出摩擦系數(shù)、磨損量的最優(yōu)工藝參數(shù)一致為(1.57 J,1.27 mm,0.37 mm)。(4)通過改變轉速、載荷、磨損時間,探究工作條件對表面摩擦性能的影響。研究結果顯示:激光沖擊微造型表面摩擦系數(shù)、磨損量、磨痕深度及寬度隨著轉速增大而減小,隨載荷及磨損時間的增大而增大。對磨痕表面SEM分析得出表面未處理磨損形式為磨粒磨損、粘著磨損、基體堆積及接觸疲勞損壞;光斑直徑0.8 mm表面微造型磨損行為主要為輕微的磨粒磨損;光斑直徑0.5 mm微造型有輕微的粘著磨損。綜上所述激光沖擊微造型有效提高Ti13Nb13Zr耐磨性能。
[Abstract]:Titanium alloy Ti13Nb13Zr has the advantages of good corrosion resistance, biocompatibility and low elastic modulus. It is the preferred material for human bone replacement. However, the wear resistance of titanium alloy is poor, which seriously restricts the application of titanium alloy. In order to improve the wear resistance of titanium alloy, the wear resistance of medical titanium alloy Ti13Nb13Zr was studied by laser impact micro-modeling method. The main work is as follows: (1) based on single-point laser micro-impact Ti13Nb13Zr experiment, The effect of process parameters on the surface impact deformation and mechanical properties of titanium alloy Ti13Nb13Zr was studied. The results show that with the increase of laser energy and impact times, the depth of pits, nano-hardness and elastic modulus, the depth of influence layer of microstructure increases gradually, but the increase decreases, and the grain refinement degree of the surface layer is the largest at the center of the pit. With the increase of depth, the grain refinement degree decreases gradually. (2) the numerical model of laser impact on Ti _ (13) NB _ (13) Zr alloy is established, and the correctness of the numerical model is verified by the experimental results. The effects of pit spacing, pit dislocations on surface morphology and residual stress provide support for the friction reduction and wear resistance mechanism of subsequent micro-molding. (3) in order to obtain the influence of process parameters on friction coefficient, wear quantity and optimum process parameters, Based on the Box-benhken experimental design, the friction coefficient and wear quantity fitting analysis of multi-point laser impact micro-molding surface are carried out. The results show that the friction coefficient and wear mass increase with the increase of laser energy, while the friction coefficient and wear amount decrease gradually with the increase of the hole dislocation from 0 mm to 0.4 mm, and the friction coefficient and wear quantity decrease with the increase of the spacing between the pits. The wear volume and friction coefficient decrease first and then increase slowly, and the friction coefficient and wear quantity are minimum at the distance of about 1.5 mm, and the laser energy and pit spacing are obtained when the friction coefficient is minimum by optimizing the response value. The process parameters of the pit dislocation are (1.2 J ~ (1.5) mm ~ (0.4) mm).) when the wear amount of (1. 2 J ~ (1. 49) mm ~ 0. 4 mm).) is the minimum. The friction coefficient and wear amount of the surface of the spot 0.5 mm in diameter decrease with the increase of laser energy and the dislocation of the pit, and then increase with the increase of the spacing between the pits. The friction coefficient is obtained by optimizing the response value. The optimum technological parameters of wear amount are (1. 57J 1. 27mm / 0. 37 mm). (4) by changing rotational speed, load, wear time, and exploring the influence of working conditions on the surface friction properties. The results show that the friction coefficient, wear amount, depth and width of wear mark decrease with the increase of rotational speed, and increase with the increase of load and wear time. SEM analysis shows that the wear patterns of untreated surface are abrasive wear, adhesion wear, matrix stacking and contact fatigue damage, and the wear behavior of micro-moulding on the surface of 0.8 mm light spot diameter is mainly slight abrasive wear. Spot diameter 0.5 mm micro molding has slight adhesive wear. To sum up, laser impact micro molding can effectively improve the wear resistance of Ti 13 NB 13 Zr.
【學位授予單位】：江蘇科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG665;TG146.23;R318.08

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