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U基二元熔體的熱力學(xué)計(jì)算
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β-Grain Growth and Influence of Its Grain Size on Damage-Tolerance Property in Titanium Alloy
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    摘要:

    分別對a+b 兩相區(qū)及b單相區(qū)鍛造的TC4合金在相變點(diǎn)以上溫度保溫，然后對不同溫度條件下原始b晶粒尺寸進(jìn)行統(tǒng)計(jì)，并測試了幾種不同晶粒尺寸下的疲勞裂紋擴(kuò)展速率及斷裂韌性。晶粒尺寸統(tǒng)計(jì)結(jié)果顯示：原始b晶粒尺寸不僅與熱處理溫度和時(shí)間有關(guān)，也與鍛造工藝有關(guān)。原始b晶粒尺寸與保溫時(shí)間呈指數(shù)關(guān)系；在1 h條件下原始b晶粒尺寸并不總是隨溫度的升高一直增大，在某個(gè)溫度范圍內(nèi)有一極值；鍛造工藝不同，原始b晶粒尺寸波動(dòng)也不同。從晶粒生長的熱力學(xué)及動(dòng)力學(xué)兩方面對上述現(xiàn)象進(jìn)行了分析。力學(xué)性能結(jié)果顯示晶粒尺寸對裂紋擴(kuò)展速率及斷裂韌性均有影響，并對影響機(jī)理進(jìn)行了分析。

    Abstract:

    The purpose of the present study is to know the influences of thermo-mechanical processing and heat-treatment on the prior b-grain size of TC4 titanium alloy, and the influence of grain size on damage-tolerance properties is also discussed. The average b-grain sizes under different thermo-mechanical processing and solution treatment conditions were measured. Noticeable difference of b-grain growth behavior was found between α+b forged and b forged TC4 alloy under the same heat-treatment conditions. The exponential relationship between b-grain size and solution time was presented. The results show that b-grain size does not always increase with increasing of solution-treatment temperature; a limit value of the grain size will appear in certain temperature region. For different forging process, the fluctuation of the prior b -grain size is different. This phenomenon is discussed in terms of grain growth thermodynamics and kinetics laws. Damage-tolerance properties results show that grain size has noticeable influence on fatigue crack growth rate and fracture toughness property.

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張新建,汪小琳,羅 超. U基二元熔體的熱力學(xué)計(jì)算[J].稀有金屬材料與工程,2009,38(4):603~606.[Zhang Xinjian, Wang Xiaolin, Luo Chao.β-Grain Growth and Influence of Its Grain Size on Damage-Tolerance Property in Titanium Alloy[J]. Rare Metal Materials and Engineering,2009,38(4):603~606.]
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  • 收稿日期:2008-06-21
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