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高溫時(shí)效時(shí)間對(duì)定向凝固DZ951鎳基高溫合金組織和持久性能的影響
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Influence of High-Temperature Aging Time on Microstructure and Stress Rupture Property of Directionally Solidified DZ951 Ni-Based Superalloys
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    摘要:

    采用光學(xué)顯微鏡和掃描電子顯微鏡研究了高溫時(shí)效時(shí)間對(duì)DZ951合金組織及其持久性能的影響。結(jié)果表明，合金在1130 ℃高溫時(shí)效時(shí)，碳化物由鑄態(tài)時(shí)的骨架狀變成塊狀，呈不連續(xù)狀分布在晶界。隨著保溫時(shí)間的延長(zhǎng)，g ￠立方度降低，尺寸增加。保溫6 h時(shí)，g ￠粗化形筏。合金在1130 ℃高溫時(shí)效時(shí)，由于g ￠部分固溶，并在隨后的冷卻過(guò)程中析出細(xì)小球形g ￠相，隨著保溫時(shí)間的增加，細(xì)小g ￠相的體積分?jǐn)?shù)增多。DZ951合金在1100 ℃，60 MPa的持久壽命隨保溫時(shí)間增加而降低，延伸率增加。g ￠粗化形筏對(duì)合金持久壽命是不利的。

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    Influence of high-temperature aging time on microstructure and stress rupture property of DZ951 superalloys was investigated by optical microscopy (OM) and scanning electronic microscopy (SEM). The results reveal that carbide changes from skeleton-like of as-cast alloy to block-like and discontinuously distributes in grain boundary when the alloy is aged at 1130 °C. g￠ cubicity decreases and the size of g￠ phase increases with the elongation of holding time at 1130 °C. g￠ coarsens and rafts when the holding time is 6 h. For solid solution of some g￠, fine and spherical g￠ phase precipitates during the following cooling process after 1130 °C aging treatment. The volume fraction of fine g￠ phase increases with prolonging the holding time. The stress rupture life of DZ951 alloy at 1100 °C/60 MPa reduces and the elongation increases with the prolongation of holding time. Coarsening and rafting of g￠ is deleterious to the stress rupture life for alloys.

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夏鵬成,于金江,孫曉峰,管恒榮,胡壯麒.高溫時(shí)效時(shí)間對(duì)定向凝固DZ951鎳基高溫合金組織和持久性能的影響[J].稀有金屬材料與工程,2010,39(1):69~71.[Xia Pengcheng, Yu Jinjiang, Sun Xiaofeng, Guan Hengrong, Hu Zhuangqi. Influence of High-Temperature Aging Time on Microstructure and Stress Rupture Property of Directionally Solidified DZ951 Ni-Based Superalloys[J]. Rare Metal Materials and Engineering,2010,39(1):69~71.]
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  • 收稿日期:2009-01-23
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