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雙態(tài)組織高Nb-TiAl合金的缺口敏感性
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許正芳(1982—),女,工程師。

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國家自然科學(xué)基金項目(51831001,51671016);河南省自然科學(xué)基金項目(162300410342)


Notch Sensitivity of High Nb Containing TiAl Alloy with Duplex Microstructure
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    摘要:

    通過對圓棒狀缺口試樣和無缺口光滑試樣進行單向拉伸試驗,研究了雙態(tài)組織高Nb-TiAl合金的缺口敏感性。研究表明,缺口根半徑R≥0.5 mm的U型試樣和缺口角度60°、R≥1 mm的V型試樣的抗拉強度RmN都大于光滑試樣的抗拉強度Rm,缺口敏感度NSR均大于1,合金對缺口不敏感。當(dāng)缺口類型相同時,缺口敏感性隨缺口根半徑R的減小而增大;V型缺口敏感性大于U型缺口;對于V型缺口試樣,當(dāng)R=0.5 mm時,其NSR在0.98~1.03之間,RmN在Rm附近波動,易出現(xiàn)缺口敏感。

    Abstract:

    The notch sensitivity of a high Nb containing TiAl alloy with duplex microstructure has been studied by monotonic tensile testing using round club-shaped notched and unnotched samples. The results show that the alloy doesn’t exist notch sensitivity for the specimens with U-shape notch of root radius more than 0.5 mm and those with 60° V-shape notch of root radius more than 1 mm. The strength of the notched specimens(RmN) is higher than that of the unnotched specimens(Rm) that the mean coefficient of notch sensitivity(NSR) is larger than 1. The notch sensitivity increases as the reduction of the root radius with the same notch shape. The V-shape notch is more sensitive than the U-shape, and the NSR of the V-shape notch of root radius 0.5 mm fluctuates from 0.98 to 1.03,that is RmN approximates to Rm and easier to cause notch sensitivity.

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許正芳,徐向俊,林均品.雙態(tài)組織高Nb-TiAl合金的缺口敏感性[J].鈦工業(yè)進展,2020,37(3):6-9.

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  • 收稿日期:2020-03-30
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  • 在線發(fā)布日期: 2020-09-02
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