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顯微組織均勻性對(duì)片層Ti-55531合金高周疲勞裂紋萌生的影響
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西北工業(yè)大學(xué) 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,西北有色金屬研究院,西北有色金屬研究院,西北有色金屬研究院,西北有色金屬研究院,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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國(guó)家自然科學(xué)(51471136)；國(guó)家國(guó)際科技合作(中法合作)項(xiàng)目(2015DF151430)。


Influence of microstructure homogeneity on high-cycle fatiguecrack initiation of Ti-55531 alloy with lamellar microstructure
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,,Northwest Institute for Nonferrous Metal Research,Xi’an,Northwest Institute for Nonferrous Metal Research,Xi’an,Northwest Institute for Nonferrous Metal Research,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an

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    摘要:

    采用高周拉壓疲勞試驗(yàn)，測(cè)試了片層Ti-55531合金的室溫高周疲勞性能；利用TEM、SEM等分析檢測(cè)方法，研究了近裂紋源區(qū)次生裂紋特征，以及顯微組織均勻性對(duì)高周疲勞裂紋萌生的影響。結(jié)果發(fā)現(xiàn)：該片狀Ti-55531合金室溫高強(qiáng)疲勞強(qiáng)度(σ-1(1×107))可達(dá)639 MPa。合金顯微組織中含少量晶界α和大量10~50 μm大小的組織不均勻區(qū)，疲勞變形時(shí)，晶界α處開(kāi)裂或組織不均勻區(qū)內(nèi)次生αs斷裂、αs/βr界面處開(kāi)裂等萌生微裂紋，促進(jìn)合金的疲勞失效。

    Abstract:

    The influence of microstructure homogeneity on crack intiation behavior under high-cycle fatigue (HCF) test at room temperature was studied in Ti-55531 alloy with lamellar microstructure by TEM and SEM methods. The results show that the HCF strength of Ti-55531 alloy could be as high as 639 MPa. However, a small amount of grain boundary (GB) α and a large number of inhomogenious regions in microstructure significantly effect the HCF behavior of lamellar Ti-55531 alloy. Fatigue microcracks mainly initiated at interfaces between αs and β phases owing to their different structure and properties. Moreover, small amount of microcracks initiated at GB α and αs phases during fatigue.

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黃朝文,趙永慶,辛社偉,周偉,李倩,曾衛(wèi)東.顯微組織均勻性對(duì)片層Ti-55531合金高周疲勞裂紋萌生的影響[J].稀有金屬材料與工程,2017,46(3):663~668.[Huang Chaowen, Zhao Yongqing, Xin Shewei, Zhou Wei, Li Qian, Zeng Weidong. Influence of microstructure homogeneity on high-cycle fatiguecrack initiation of Ti-55531 alloy with lamellar microstructure[J]. Rare Metal Materials and Engineering,2017,46(3):663~668.]
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歷史
  • 收稿日期:2016-04-21
  • 最后修改日期:2016-06-29
  • 錄用日期:2016-07-15
  • 在線發(fā)布日期: 2017-05-18
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