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TC4-DT鈦合金疲勞裂紋擴展行為及Paris區(qū)轉(zhuǎn)折點
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更新時間：2015-08-29
研究TC4-DT鈦合金在近門檻區(qū)的疲勞裂紋擴展速率和Paris區(qū)的轉(zhuǎn)折點現(xiàn)象，并通過掃描電鏡分析斷口形貌和擴展路徑，討論等軸初生α相含量對TC4-DT鈦合金疲勞裂紋擴展行為的影響規(guī)律。
TC4-DT鈦合金疲勞裂紋擴展行為及Paris區(qū)轉(zhuǎn)折點Fatigue crack propagation behavior and turning point in
Paris region of TC4-DT titanium alloys
研究TC4-DT鈦合金在近門檻區(qū)的疲勞裂紋擴展速率和Paris區(qū)的轉(zhuǎn)折點現(xiàn)象，并通過掃描電鏡分析斷口形貌和擴展路徑，討論等軸初生α相含量對TC4-DT鈦合金疲勞裂紋擴展行為的影響規(guī)律。結(jié)果表明：隨著等軸初生α相含量的減少，TC4-DT鈦合金在近門檻區(qū)的疲勞裂紋擴展速率顯著降低，并在da/dN—ΔK曲線的Paris區(qū)逐漸呈現(xiàn)轉(zhuǎn)折點現(xiàn)象，轉(zhuǎn)折點位置所對應(yīng)的DKt值逐漸增大；片層組織在近門檻區(qū)的裂紋擴展路徑曲折，疲勞裂紋擴展速率顯著降低。
The fatigue crack growth rate and the turning point in
Paris region of the curves of the TC4-DT titanium alloy was compared. The effect
of the content of primary α phase on fatigue crack propagation behavior of
lamellar microstructure of TC4-DT titanium alloy was discussed by scanning
electron microscopy (SEM) analyses of fracture morphology and crack propagation
paths. The results show that there occurs lower fatigue crack growth rate with
decrease in the content of primary α phase, with appearance of the turning point
in Paris region and increase in the ΔKt of turning point. The
lamellar microstructure exhibits tortuous crack paths and fatigue crack
propagation resistance, which indicates that the lamellar structure has better
damage tolerance compared with bimodal structure.
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