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合金成分和工藝參數(shù)對鎳基鑄造高溫合金GMR235組織和性能的影響
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Effect of Composition and Processing Parameters on Microstructure and Mechanical Properties of Nickel-base Cast Superalloy GMR235
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    摘要:

    研究了微量元素(C, B, Zr)含量、澆注方式和熱處理制度對鎳基高溫合金GMR235組織和性能的影響，并利用熱力學(xué)軟件計(jì)算了合金平衡相圖。結(jié)果表明：設(shè)計(jì)合金中主要的平衡相為γ′相、M6C碳化物、一次碳化物MC相、M3B2硼化物、M23C6和γ相基體。C含量為0.18%(質(zhì)量分?jǐn)?shù))時(shí)鑄態(tài)合金具有較好的持久性能和高溫拉伸性能。添加合金元素B、Zr可明顯提高合金的持久壽命、改善持久塑性，抑制碳化物析出，并使碳化物顆粒細(xì)化。鑄模溫度為800 ℃、出鋼溫度為1420 ℃時(shí)，合金的綜合性能最優(yōu)。經(jīng)過5 h時(shí)效后，合金高溫持久壽命明顯升高且保持了鑄態(tài)時(shí)的塑性。隨著時(shí)效時(shí)間延長，γ′相粗化使合金高溫抗拉伸強(qiáng)度降低

    Abstract:

    The effect of the micro-alloying elements (C, B, Zr), casting system and aging treatment on microstructure and mechanical properties of Ni based superalloy GMR235 was studied. The equilibrium phase diagram of the alloy was calculated by Thermo-Calc software. The results show that equilibrium phases contain γ, γ’, M6C, MC, M23C6 carbides and M3B2. Proper carbon addition can improve the rupture life of the alloy, keep its plasticity and increase the high temperature tensile properties. The addition of micro-alloying elements B and Zr can improve the high temperature stress rupture properties and plastic properties of the alloy, restraining the precipitation of the carbide and refining carbide particles. The optimum properties can be obtained when the mould temperature is 800 oC and tapping temperature is 1420 oC. Rupture life is significantly increased after 5 h aging with good plastic properties like as-cast alloys. g￠ coarsens as the aging time gets longer, decreasing the strength of the alloy at high temperature

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史世鳳,胡博煒,范 強(qiáng),賈崇林,牛永吉.合金成分和工藝參數(shù)對鎳基鑄造高溫合金GMR235組織和性能的影響[J].稀有金屬材料與工程,2011,40(11):2038~2041.[Shi Shifeng, Hu Bowei, Fan Qiang, Jia Chonglin, Niu Yongji. Effect of Composition and Processing Parameters on Microstructure and Mechanical Properties of Nickel-base Cast Superalloy GMR235[J]. Rare Metal Materials and Engineering,2011,40(11):2038~2041.]
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  • 收稿日期:2011-05-07
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