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熱處理制度對超超臨界電站用GH80A合金組織和性能的影響
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國家自然科學基金和上海寶鋼集團公司聯(lián)合資助重點項目 (50831008)


Influence of Heat Treatments on Microstructures and Properties of GH80A Superalloy for Buckets of USC Steam Turbines
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    系統(tǒng)研究了不同固溶處理、固溶+時效處理以及550~750 ℃長期時效10 000 h后GH80A合金組織和性能的變化規(guī)律。結果表明：γ′相的開始析出溫度為930~950 ℃；冷卻介質比固溶溫度對冷卻γ′相的影響大，水淬能夠抑制GH80A合金γ′相的析出；時效溫度對一次γ′相有重要影響；雙時效處理才析出二次γ′相；隨固溶溫度升高，合金單/雙時效后的強度稍有降低而塑性升高；長期時效溫度不高于700 ℃時合金的組織穩(wěn)定性良好，一次γ′相的粗化機制在700 ℃以下以擴散控制為主，750 ℃以界面控制為主

    Abstract:

    The microstructure evolution and property variation of GH80A superalloy after a series of solution heat treatments, single or double aging treatments and long time aging at 550~750 °C for 10 000 h were investigated. Results show that the precipitation temperature of γ′ precipitates is identified as 930~950 °C. The γ′ precipitation could be inhibited by water quenching and cooling medium shows more effects on cooling γ′ precipitate than the solution temperature. Primary γ′ precipitates are strongly influenced by aging temperature and the precipitation of secondary γ′ precipitates just begins at double aging stage. The tensile strength after single/double aging is decreased a little with the solution temperature increasing while the plasticity is increased. Long-time aging microstructure shows good stability below 700 °C and the coarsening of primary γ′ precipitates proceeds by volume diffusion below 700 °C while by interface controlling at 750 °C

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于秋穎,董建新,張麥倉,謝錫善,姚志浩.熱處理制度對超超臨界電站用GH80A合金組織和性能的影響[J].稀有金屬材料與工程,2013,42(7):1507~1512.[Yu Qiuying, Dong Jianxin, Zhang Maicang, Xie Xishan, Yao Zhihao. Influence of Heat Treatments on Microstructures and Properties of GH80A Superalloy for Buckets of USC Steam Turbines[J]. Rare Metal Materials and Engineering,2013,42(7):1507~1512.]
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  • 收稿日期:2012-07-13
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