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Hastelloy G-3合金熱變形特性研究
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國家自然科學基金重點項目（50831008）


Research on Hot Deformation Behavior of Hastelloy G-3 Alloy
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    摘要:

    利用變形溫度為1050~1200 ℃、應(yīng)變速率為0.1~10 s-1的恒溫熱壓縮試驗系統(tǒng)分析了Hastelloy G-3合金的高溫變形特性及變形后的組織特征。對高應(yīng)變速率下的流動應(yīng)力進行變形熱效應(yīng)修正，建立了G-3合金熱變形過程中峰值應(yīng)力與變形溫度、應(yīng)變速率關(guān)系的本構(gòu)模型。結(jié)果表明：所建立的本構(gòu)模型在預測G-3合金熱變形峰值應(yīng)力時具有良好的精確度，能夠滿足工程應(yīng)用的要求。G-3合金熱加工過程的軟化機制為動態(tài)再結(jié)晶，根據(jù)熱變形后的組織特征確定G-3合金合理的熱變形溫度為1180~1200 ℃，應(yīng)變速率為5~10 s-1。

    Abstract:

    The hot deformation behavior and the subsequent microstructure characteristics of Hastelloy G-3 alloy were studied by isothermal compression tests at the strain rates of 0.1-10 s-1 and the temperatures of 1050-1200 oC. The flow-stress at high strain rates were corrected considering the effect of deformation heating, and a new constitutive relationship between peak stress and deformation temperature as well as strain rate for G-3 alloy at high temperature was established. The results show that the built material model has good fitting accuracy to satisfy the engineering need. The softening mechanism of G-3 alloy is dynamic recrystalization during hot working process. According to the microstructures after deformation, for G-3 alloy the proper deformation temperature is 1180-1200 oC and the proper strain rate is 5-10 s-1.

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羅坤杰,張麥倉,王寶順,董建新. Hastelloy G-3合金熱變形特性研究[J].稀有金屬材料與工程,2011,40(4):605~609.[Luo Kunjie, Zhang Maicang, Wang Baoshun, Dong Jianxin. Research on Hot Deformation Behavior of Hastelloy G-3 Alloy[J]. Rare Metal Materials and Engineering,2011,40(4):605~609.]
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  • 收稿日期:2010-04-23
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