Mar-M247铸造高温合金平衡析出相热力学计算与分析
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摘要
以Mar-M247合金为对象,通过热力学模拟计算,研究合金元素变化对平衡析出相、合金初熔温度和终熔温度的影响规律。结果表明:合金的主要平衡析出相为γ'相、MC、M6C、M23C6型碳化物、μ相及MB2、M3B2型硼化物,合金凝固过程中Hf和Ta元素偏析比较严重;在成分标准范围附近波动时,对初熔温度影响最大的合金元素为Cr、Mo、Ti、Hf;碳化物的析出温度和析出量均随C含量的增加呈线性递增趋势;另外,Hf、Ti、Ta含量的提高有利于MC型碳化物的析出;Cr含量的提高有利于M23C6型碳化物的析出;而W和Mo含量的提高则有利于M6C型碳化物的析出;μ相主要受Mo和W元素影响,随着二者含量的升高。μ相的析出温度和质量分数均升高;Al、Ti和Ta含量变化均会影响合金中γ′相的析出量及析出温度,并且三者对于γ′相的影响程度依次减弱。
Effects of alloying elements on the equilibrium precipitated phases, incipient and final melting temperature of Mar-M247 superalloy were studied through thermodynamic calculation. The results show that the main phases are γ' precipitates, MC, M6 C,M23 C6 carbides, μ phases, MB2 and M3 B2 borides. Hf and Ta segregate more seriously mostly during solidification process. Around the composition range, Cr, Mo, Ti and Hf influence the initial melting temperature mostly. Precipitation temperature and precipitation amount of carbides increase linearly with the increase of the C content. Furthermore, Hf, Ti and Ta are contributed to the precipitation of MC carbides, Cr improves the precipitation of M23 C6 and W and Mo are beneficial to the precipitation of M6 C.The precipitation of μ phase is mainly influenced by Mo and W, the precipitation temperature and mass fraction of μ phase increase as the content of Mo and W increase. The precipitation behavior of γ' phase is affected by Al, Ti and Ta contents, and their effects decrease in turn.
Effects of alloying elements on the equilibrium precipitated phases, incipient and final melting temperature of Mar-M247 superalloy were studied through thermodynamic calculation. The results show that the main phases are γ' precipitates, MC, M6 C,M23 C6 carbides, μ phases, MB2 and M3 B2 borides. Hf and Ta segregate more seriously mostly during solidification process. Around the composition range, Cr, Mo, Ti and Hf influence the initial melting temperature mostly. Precipitation temperature and precipitation amount of carbides increase linearly with the increase of the C content. Furthermore, Hf, Ti and Ta are contributed to the precipitation of MC carbides, Cr improves the precipitation of M23 C6 and W and Mo are beneficial to the precipitation of M6 C.The precipitation of μ phase is mainly influenced by Mo and W, the precipitation temperature and mass fraction of μ phase increase as the content of Mo and W increase. The precipitation behavior of γ' phase is affected by Al, Ti and Ta contents, and their effects decrease in turn.
引文
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[17]SHI Q,AN N,HUO J,et al.Different effect of co on the formation of topologically close-packed phases in ni-crmo and Ni-Cr-Re alloys[J].Metallurgical&Materials Transactions A,2017,48(11):5639-5648.
[18]SHI Q,AN N,HUO J,et al.Effect of co on discontinuous precipitation transformation with TCP phase in nibased alloy containing Re[J].Metallurgical&Materials Transactions:A,2017,48(5):2120-2126.
[2]CHEN J,LEE J H,JO C Y,et al.MC carbide formation in directionally solidified MAR-M247 LC superalloy[J].Materials Science and Engineering:A,1998,247(1/2):113-125.
[3]BOR H Y,WEI C N,JENG R R,et al.Elucidating the effects of solution and double ageing treatment on the mechanical properties and toughness of MAR-M247 superalloy at high temperature[J].Materials Chemistry&Physics,2008,109(2/3):334-341.
[4]陈国良.高温合金学[M].北京:冶金工业出版社,1988.(CHEN G L.Superalloys[M].Beijing:Metallurgical Industry Press,1988.)
[5]SZCZOTOK A,RODAK K.Microstructural studies of carbides in MAR-M247 nickel-based superalloy[J].IOPConference Series:Materials Science and Engineering,2012,35(1):12006-12016.
[6]MILENKOVIC S,SABIROV I,LLORCA J.Effect of the cooling rate on microstructure and hardness of MAR-M247 Ni-based superalloy[J].Materials Letters,2012,73(8):216-219.
[7]NATHAL M V,MAIER R D,EBERT L J.The Influence of Cobalt on the Microstructure of the Nickel-Base Superalloy MAR-M247[J].Metallurgical Transactions A,1982,13(10):1775-1783.
[8]RAHIMIAN M,MILENKOVIC S,SABIROV I.Microstructure and hardness evolution in MAR-M247 Ni-based superalloy processed by controlled cooling and double heat treatment[J].Journal of Alloys&Compounds,2013,550(2):339-344.
[9]BASAK A,DAS S.Microstructure of nickel-base superalloy MAR-M247 additively manufactured through scanning laser epitaxy(SLE)[J].Journal of Alloys&Compounds,2017,705:806-816.
[10]BALDAN R,NUNES C A,COELHO G C.Aging of a new niobium-modified MAR-M247 nickel-based superalloy[J].Journal of Materials Engineering&Performance,2013,22(8):2337-2342.
[11]LIAO J H,BOR H Y,WEI C N,et al.Influence of microstructure and its evolution on the mechanical behavior of modified MAR-M247 fine-grain superalloys at 871℃[J].Materials Science and Engineering:A,2012,539:93-100.
[12]SILVA P R S A E,BALDAN R,NUNES C A,et al.Solution heat-treatment of Nb-modified MAR-M247 superalloy[J].Materials Characterization,2013,75(75):214-219.
[13]傅恒志,郭景杰,刘林.先进材料定向凝固[M].北京:科学出版社,2008:70.(FU H L,GUO J J,LIU L.Directional solidification and processing of advanced materials[M].Beijing:Science Press,2008:70.)
[14]MATUSZEWSKI K,RETTIG R,RASI?SKI M,et al.The three-dimensional morphology of topologically close packed phases in a high rhenium containing nickel based superalloy[J].Advanced Engineering Materials,2014,16(2):171-175.
[15]MATUSZEWSKI K,RETTIG R,MATYSIAK H,et al.Effect of ruthenium on the precipitation of topologically close packed phases in Ni-based superalloys of 3rd and4th generation[J].Acta Materialia,2015,95:274-283.
[16]KIM K H,WITHEY P A.Microstructural investigation of the formation and development of topologically closepacked phases in a 3rd generation nickel-base single crystal superalloy[J].Advanced Engineering Materials,2017,19(6):1700041-1-1700041-10.
[17]SHI Q,AN N,HUO J,et al.Different effect of co on the formation of topologically close-packed phases in ni-crmo and Ni-Cr-Re alloys[J].Metallurgical&Materials Transactions A,2017,48(11):5639-5648.
[18]SHI Q,AN N,HUO J,et al.Effect of co on discontinuous precipitation transformation with TCP phase in nibased alloy containing Re[J].Metallurgical&Materials Transactions:A,2017,48(5):2120-2126.