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Ti-22Al-25Nb合金板條組織高溫高周疲勞行為
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1.鋼鐵研究總院;2.西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室

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TG146.2

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凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室自主研究課題資助(153-ZH-2016)；


High Cycle Fatiuge at High Temperatures of the Lamellar Microstructureof Ti-22Al-25Nb Alloy
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1.Central Iron and Steel Research Institute;2.State Key Laboratory of Solidification Processing,Northwestern Ploytechnical University,Xi’an

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    摘要:

    研究了雙尺寸板條組織的Ti-22Al-25Nb合金在650 ℃和700 ℃下的高周疲勞行為，采用升降法測(cè)試了合金的高溫高周疲勞強(qiáng)度極限，當(dāng)應(yīng)力比R=-1，循環(huán)周次Nf=107次時(shí)，650 ℃和700 ℃的疲勞強(qiáng)度極限分別為470 MPa和400 MPa。對(duì)于雙板條組織的Ti-22Al-25Nb合金，其疲勞裂紋既可萌生于試樣表面，也可萌生于次表面，并且高周疲勞裂紋在次表面形核的試樣具有更高的疲勞壽命。此外，研究發(fā)現(xiàn)雙尺寸板條組織在高溫高周疲勞損傷過(guò)程中以胞狀析出的形式發(fā)生B2→β+O相變，形成組織中的不均勻區(qū)域，促使疲勞裂紋在此優(yōu)先形核。

    Abstract:

    The high cycle fatigue (HCF) at high temperatures of bimodar size lamellar O pahse microstructure of Ti-22Al-25Nb alloy is studied. HCF strength limits of bimodar size lamellar O pahse microstructure were mearsured via a method named as small sampling up-and-down method (SSUDM). The HCF strength limits at 650℃ and 700℃ were measured to be 470MPa and 400MPa respectively with the stress ratio of -1 and the controlling cycle of 107. It is found that the samples with HCF cracks initiated at subsurfaces can provide significantly longer HCF life than the samples with HCF crack initiated at surfaces. It is found that transformation B2→β+O occurred in the mode of cellular precipitations at initial B2 grain boundaries during the HCF tests. The transformation resulted in inhomogeneous regions in the microstructure. The inhomogenieous regions are the prior cracking areas.

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梁曉波,馬雄,張建偉,曾衛(wèi)東,鄭友平. Ti-22Al-25Nb合金板條組織高溫高周疲勞行為[J].鈦工業(yè)進(jìn)展,2019,36(2).

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  • 收稿日期:2019-01-16
  • 最后修改日期:2019-03-15
  • 錄用日期:2019-03-18
  • 在線發(fā)布日期: 2020-10-22
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