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疲勞載荷下P/M Rene95合金中夾雜物的微觀行為研究
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V252.2 TG146.15

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國家自然科學基金資助項目(59871007)


Micromechanical Behavior of an Al_2O_3Seeded P/M Rene 95 Alloy under Cyclic Tensile Load
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    摘要:

    采用人工植入Al2O3夾雜的試樣,通過SEM下的原位試驗,動態(tài)跟蹤及分析了拉-拉疲勞載荷下P/M Rene95合金中表面或近表面夾雜物的微觀行為。結果表明:在所研究的夾雜物的尺度范圍內,載荷波形對夾雜物的微觀力學行為有很大影響。在三角波加載條件下,雖然夾雜物/基體界面更易萌生裂紋,但表面或近表面夾雜物對試樣的斷裂影響較?。辉谡也ㄝd荷條件下,疲勞裂紋的萌生、擴展及試樣的斷裂均與表面或近表面夾雜物的基本特性有關。而且,降低正弦波加載時的應力幅值可大大提高夾雜物/基體界面疲勞裂紋的萌生壽命。

    Abstract:

    Specially designed SEM in situ fatigue tests have been conducted to trace the whole process of crack initiation and propagation to fracture in an Al2O3 seeded P/M Rene 95 superalloy.The results show that the loading wave shape has a strong effect on the micromechanical behavior.Under triangle wave loading crack initiation and propagation life decrease on the inclusion/matrix interface,but specimen failure is not due to the surface or sub surface inclusions.On the other hand,sine wave loading is accompanied by a significant increase the crack initiation life and surface or sub surface inclusions are always the primary cause of fatigue fracture.Furthermore,under the same loading waveform the crack initiation life increases as the amplitude of applied stress decreases.

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張麥倉,王煥琴,等.疲勞載荷下P/M Rene95合金中夾雜物的微觀行為研究[J].稀有金屬材料與工程,2002,(4):283~286.[Zhang Maicang, Wang Huanqin, Zhang Lina, Xie Xishan. Micromechanical Behavior of an Al_2O_3Seeded P/M Rene 95 Alloy under Cyclic Tensile Load[J]. Rare Metal Materials and Engineering,2002,(4):283~286.]
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  • 最后修改日期:2002-02-04
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