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表面激光沖擊對(duì)雙態(tài)組織Ti55531鈦合金疲勞裂紋擴(kuò)展速率(da/dN)的影響
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1.西安交通大學(xué)機(jī)械工程學(xué)院航空發(fā)動(dòng)機(jī)研究所;2.西安交通大學(xué)材料科學(xué)與工程學(xué)院;3.西部超導(dǎo)材料科技股份有限公司

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國家自然科學(xué)基金資助（基金編號(hào)52205240）；博士后基金（基金編號(hào)2022M723874）；陜西省創(chuàng)新能力支撐計(jì)劃資助（項(xiàng)目編號(hào)2022KJXX-84）


Effect of surface laser shock on fatigue crack propagation rate (da/dN) of Ti55531 titanium alloy with two-state microstructure
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1.Xi’an Jiaotong University,School of mechanical engineering,Xi’an;2.Xi’an Jiaotong University,School of Materials Science and Engineering,Xi’an

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    摘要:

    對(duì)激光沖擊前后，雙態(tài)組織Ti55531鈦合金的疲勞裂紋擴(kuò)展速率（da/dN）進(jìn)行了研究。分析了激光沖擊前后疲勞裂紋擴(kuò)展樣品的斷口、微觀組織和殘余應(yīng)力。結(jié)果表明，經(jīng)過激光沖擊，雙態(tài)組織Ti55531鈦合金的疲勞裂紋擴(kuò)展速率da/dN降低，當(dāng)△K＜22.84Mpa?√m時(shí)，激光沖擊后樣品（BM-LSP）具有比未沖擊樣品（BM）更低的疲勞裂紋擴(kuò)展速率，當(dāng)△K=22.84時(shí)，二者具有相近的裂紋擴(kuò)展速率，為3.92×10-4mm/cycle。LSP后次生α相片層長(zhǎng)度離散性降低22.9%，厚度離散性降低38.9%，α相和β相的極密度分別降低37%和16%，片層α尖端鈍化和組織均勻化緩解了疲勞裂紋擴(kuò)展過程中α片層尖端及α/β相界面處的應(yīng)力集中，造成da/dN下降。此外，激光沖擊過程中在材料表面引入深度約900μm的殘余壓應(yīng)力層。殘余壓應(yīng)力也是抵消裂紋尖端拉應(yīng)力、增強(qiáng)裂紋閉合、減緩裂紋擴(kuò)展的重要因素。

    Abstract:

    The fatigue crack propagation rate (da/dN) of bimodal structure Ti55531 titanium alloy before and after laser shock peening（LSP）was investigated. The fracture, microstructure and residual stress of fatigue crack propagation samples were analyzed. The results show that after laser shock, the fatigue crack growth rate da/dN decreased. When △K < 22.84MPa?√m, the sample BM-LSP has a lower fatigue crack growth rate than the sample without laser shock BM. When △K=22.84 the crack growth rates of the two samples were similar that is 3.92×10-4mm/cycle. After LSP, the length dispersion and thickness dispersion of the secondary α layer decreased by 22.9%, 38.9%, and the polar density of α and β phases decreased by 37% and 16%, respectively. The passivity of the lamer α tip and microstructure homogenization alleviated the stress concentration, resulting in a decrease in da/dN. In addition, the laser shock process introduces a residual compressive stress layer to a depth of about 900μm on the surface of the material. Residual compressive stress is also an important factor to offset tensile stress at crack tip, enhance crack closure and slow down crack propagation.

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史蒲英,陳林,龐智聰,李芹芹,何衛(wèi)鋒,劉向宏.表面激光沖擊對(duì)雙態(tài)組織Ti55531鈦合金疲勞裂紋擴(kuò)展速率(da/dN)的影響[J].稀有金屬材料與工程,2024,53(10):2823~2830.[Shi Puying, Chen Lin, Pang Zhicong, Li Qinqin, He Weifeng, Liu Xianghong. Effect of surface laser shock on fatigue crack propagation rate (da/dN) of Ti55531 titanium alloy with two-state microstructure[J]. Rare Metal Materials and Engineering,2024,53(10):2823~2830.]
DOI：10.12442/j. issn.1002-185X.20240390

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  • 收稿日期:2024-06-29
  • 最后修改日期:2024-08-15
  • 錄用日期:2024-08-15
  • 在線發(fā)布日期: 2024-10-17
  • 出版日期: 2024-09-27