600 ℃時鈦合金高溫低循環(huán)疲勞行為及其微觀機理
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-01-14
研究近α型TG6鈦合金盤鍛件雙態(tài)組織在600 ℃不同應(yīng)變幅條件下的低循環(huán)疲勞行為，總應(yīng)變幅?εt/2控制在±0.6%～±1.5%，應(yīng)變比R＝?1，采用三角波方式加載。
600 ℃時鈦合金高溫低循環(huán)疲勞行為及其微觀機理High temperature low cycle fatigue behavior and?its micro-mechanism of titanium alloy at 600 ℃研究近α型TG6鈦合金盤鍛件雙態(tài)組織在600 ℃不同應(yīng)變幅條件下的低循環(huán)疲勞行為，總應(yīng)變幅?εt/2控制在±0.6%～±1.5%，應(yīng)變比R＝?1，采用三角波方式加載。結(jié)果表明：600 ℃低循環(huán)疲勞條件下，隨著總應(yīng)變幅的增加，循環(huán)峰值應(yīng)力smax提高，而疲勞壽命Nf下降；對于TG6鈦合金盤鍛件雙態(tài)組織，存在一個循環(huán)軟化/硬化的總應(yīng)變幅臨界值(?εt/2)c，約為±1.0%，當總應(yīng)變幅高于此值，表現(xiàn)為循環(huán)硬化行為，而低于此值時，則表現(xiàn)為循環(huán)軟化行為；在所有應(yīng)變幅條件下，疲勞裂紋均為多源萌生模式，600 ℃低循環(huán)疲勞變形行為主要受α晶粒內(nèi)位錯的平面滑移所控制，位錯平面滑移集中的結(jié)果是最早在α晶粒內(nèi)萌生疲勞裂紋；隨著疲勞測試溫度的提高，不同滑移系上位錯滑移的臨界分切應(yīng)力的差別縮小，促進位錯交滑移的進行。
High temperature low cycle fatigue behavior and its micro-mechanism of near a TG6 titanium alloy disc forging with duplex microstructure in different strain amplitude at 600 ℃ were studied. The total strain amplitudes (?εt/2) and strain ratio R were controlled at ±0.6%?±1.5% and ?1, and tested with triangular waveform loading. The results show that the maximum tensile stress (smax) increases and the low cycle fatigue life (Nf) decreases with increasing ?εt/2 under low cycle fatigue at 600 ℃. The critical total strain amplitude ((?εt/2)c) of cyclic hardening and softening is about ±1.0% for TG6 titanium alloy disc forging with α+β microstructure, the cyclic hardening behavior dominates while the strain amplitude is above (?εt/2)c, and the cyclic softening behavior dominates while the strain amplitude is below the (?εt/2)c. The fatigue crack initiates at several origins under cyclic deformation at all strain amplitude. The LCF fatigue behavior is controlled by planar slip of dislocation and which may result in fatigue crack in the α grain. The difference of critical resolved shear stress (CRSS) at each slip plane is gradually reduced, and which may promote the cross slip of dislocations.
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