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GH625鎳基合金高溫塑性變形加工圖研究
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國家自然科學(xué)基金和寶山鋼鐵股份有限公司聯(lián)合資助 (50834008)


Study on the Processing Map of GH625 Ni-Based Alloy Deformed at High Temperature
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    摘要:

    在Gleeble熱模擬機(jī)上對(duì)GH625合金進(jìn)行了等溫?zé)釅嚎s實(shí)驗(yàn)，獲得了不同變形條件下該合金的真應(yīng)力真應(yīng)變曲線。利用DMM模型構(gòu)建了GH625合金在不同應(yīng)變量下的加工圖，通過對(duì)加工圖的分析，可以得到：GH625合金加工圖中存在一個(gè)功率耗散效率較高的區(qū)域，其對(duì)應(yīng)的變形溫度為1100~1200 ℃，應(yīng)變速率為0.01~1.0 s-1，在該變形區(qū)域內(nèi)，合金發(fā)生了完全動(dòng)態(tài)再結(jié)晶。當(dāng)功率耗散效率為0.4~0.45時(shí)，動(dòng)態(tài)再結(jié)晶晶粒細(xì)小均勻；在峰值效率0.47時(shí)，動(dòng)態(tài)再結(jié)晶晶粒出現(xiàn)明顯的長大趨勢；在低溫高應(yīng)變速率下存在一個(gè)較小的流變失穩(wěn)區(qū)，該區(qū)域內(nèi)的動(dòng)態(tài)再結(jié)晶晶粒沿絕熱剪切帶分布。實(shí)際生產(chǎn)中工藝參數(shù)的制定應(yīng)盡量選擇在完全動(dòng)態(tài)再結(jié)晶區(qū)內(nèi)加工，避免在失穩(wěn)區(qū)加工成型?；贕H625合金加工圖及微觀顯微組織分析可得該合金的適宜加工區(qū)域?yàn)椋?0.01~1.0 s-1，T=1100~1200 ℃

    Abstract:

    The isothermal compression test of GH625 alloy was performed on Gleeble thermal simulator. A series of true stress-strain curves under different deformation conditions were obtained. The processing map of GH625 alloy in different strains was constructed according to DMM model, and the following conclusions can be obtained through the analysis of processing map. There exists an area in the processing map of GH625 alloy where the power dissipation efficiency is higher than that in others areas. The temperature corresponding the area is 1100~1200 ℃ and the strain rate is 0.01~1.0 s-1. In this area the alloy has completed fully dynamic recrystallization. When the power dissipation efficiency is in the range from 0.4 to 0.45, the dynamic recrystallization grains become finer. At the peak efficiency of 0.47, the dynamic recrystallization grains grow up apparently. There exists a small area of rheological instability in the processing map where the temperature is low, while the strain rate is high, and the dynamic recrystallization grains are distributed along the adiabatic shearing edges. The practical parameters of production processing should be chosen in fully dynamic recrystallization area, and the manufacturing in the instability zone should be avoided. According to the comprehensive mechanical properties of high temperature deformation, the microstructure evolution and the processing map of the GH625 alloy, we can get a suitable processing area, which is =0.01~1.0 s-1，T=1100~1200 ℃

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李德富,吾志崗,郭勝利,郭青苗,彭海健,胡 捷. GH625鎳基合金高溫塑性變形加工圖研究[J].稀有金屬材料與工程,2012,41(6):1026~1031.[Li Defu, Wu Zhigang, Guo Shengli, Guo Qingmiao, Peng Haijian, Hu Jie. Study on the Processing Map of GH625 Ni-Based Alloy Deformed at High Temperature[J]. Rare Metal Materials and Engineering,2012,41(6):1026~1031.]
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  • 收稿日期:2011-06-11
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