FeCrAl不銹鋼的平衡凝固相變與析出行為

鄧振強; 劉建華; 何楊; 韓志彪; 蘇曉峰; 丁浩

doi:10.13374/j.issn2095-9389.2017.05.009

FeCrAl不銹鋼的平衡凝固相變與析出行為

doi: 10.13374/j.issn2095-9389.2017.05.009

北京科技大學工程技術研究院, 北京 100083

基金項目:

國家自然科學基金資助項目（51374023，51574022）

詳細信息

中圖分類號: TF61
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出版歷程
- 收稿日期: 2016-07-13

Phase transformations and precipitation behavior in FeCrAl stainless steel during equilibrium solidification

Institute of EngineeringTechnology, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 借助Thermo-calc軟件對FeCrAl不銹鋼所屬的Fe-（18~21） Cr-（3~5） Al-（0~0.03） C-（0~0.2） Si-（0~0.2） Mn多元體系在凝固過程中的相變及析出行為進行了研究.采用Thermo-calc中TCFE7數據庫對該體系的垂直截面圖進行計算，分析了不同組元對凝固和冷卻過程中相變的影響，并得到FeCrAl不銹鋼的平衡凝固相變路徑圖.結果表明FeCrAl不銹鋼由1600℃平衡冷卻至300℃的過程中完整的平衡相變路徑為：L→AlN+αδFe→AlN+αδFe+Cr₇C₃→AlN+αδFe+Cr₇C₃+Cr₂₃C₆→AlN+αδFe+Cr₂₃C₆→AlN+αδFe+Cr₂₃C₆+σ→AlN+αδFe+Cr₂₃C₆+σ+α'→AlN+αδFe+Cr₂₃C₆+α'.凝固過程中Cr₇C₃與σ相是否析出分別取決于體系中C、Si含量；Al含量的提高可擴大αδFe+Cr₇C₃的穩定區，降低α'相的析出溫度，抑制σ相的析出；Cr含量的提高可以減小αδFe+Cr₇C₃的穩定區，擴大σ相和α'相的穩定區.
- FeCrAl不銹鋼 /
- Thermo-Calc /
- 相圖計算 /
- 凝固模式
Abstract: The phase transformations and precipitation behavior were investigated by using Thermo-Calc software in the Fe-(18-21)Cr-(3-5)Al-(0-0.03)C-(0-0.2)Si-(0-0.2)Mn multicomponent system relevant to FeCrAl stainless steel during solidification. The vertical sections of this system were calculated by using the TCFE7 database. Based on these vertical sections, the influence of different elements was analyzed in the phase transformations during solidification and a diagram of the phase-transformation path of FeCrAl stainless steel was obtained during equilibrium solidification. The results indicate that the full-phase transformation path of FeCrAl stainless steel during the cooling process from 1600℃ to 300℃ is as follows:L→AlN+αδFe→AlN+αδFe+Cr₇C₃→AlN+αδFe+Cr₇C₃+Cr₂₃C₆→AlN+αδFe+Cr₂₃C₆→AlN+αδFe+Cr₂₃C₆+σ→AlN+αδFe+Cr₂₃C₆+σ+α'→AlN+αδFe+Cr₂₃C₆+α'. The precipitation of Cr₇C₃ and σ, during the solidification process mainly depends on the carbon and silicon contents in the system, respectively. Increasing the aluminum content can enlarge the stable region of αδFe+Cr₇C₃, lower the precipitation temperature of α', and restrain σ precipitation. Increasing the chromium content can reduce the stable region of αδFe+Cr₇C₃ and enlarge the stable region of σ and α'.
- FeCrAl stainless steel /
- Thermo-Calc /
- phase diagram calculation /
- solidification mode

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參考文獻(22)

[1]	Fukaya M. Material properties of Fe-Cr-Al alloy foil for metal support. J Mater Manuf, 1997, 106:5
[2]	Inoue Y, Kikuchi M, Tendo M, et al. Development of heat resistant stainless steel NSSCⓇ 21M for catalysis substrate of motorcycle muffler. Nippon Steel Tech Rep, 2010(99):45
[3]	Emmerich K. The use of rapidly solidified ribbons in automotive exhaust gas catalyst substrates. Mater Sci Eng A, 1991, 134:1016
[4]	Rivlin V G, Raynor G V. Phase equilibria in iron ternary alloys 3:critical evaluation of constitution of aluminium-chromium-iron system. Int Met Rev, 1980, 25(1):139
[5]	Hall E O, Algie S H. The sigma phase. Int Mater Rev, 1966, 11(1):61
[6]	Premachandra K, Cartie M B, Eric R H. Effect of stabilising elements on formation of σ phase in experimental ferritic stainless steels containing 39%Cr. Mater Sci Technol, 1992, 8(5):437
[7]	Zubchenko A S. σ-phase formation in chromium ferritic steels. Met Sci Heat Treat, 1982, 24(4):274
[8]	Schaeffler A L. Constitution diagram for stainless-steel weld metal. 2:Schaeffler diagram. Met Prog Databook, 1974, 106(1):227
[9]	Konosu S, Mashiba H, Takeshima M, et al. Effects of pretest aging on creep crack growth properties of type 308 austenitic stainless steel weld metals. Eng Failure Anal, 2001, 8(1):75
[10]	Reis G S, Jorge Jr A M, Balancin O. Influence of the microstructure of duplex stainless steels on their failure characteristics during hot deformation. Mater Res, 2000, 3(2):31
[11]	Lopez N, Cid M, Puiggali M. Influence of σ-phase on mechanical properties and corrosion resistance of duplex stainless steels. Corros Sci, 1999, 41(8):1615
[12]	Ravindranath K, Malhotra S N. Influence of aging on intergranular corrosion of a 25% chromium-5% nickel duplex stainless steel. Corros, 1994, 50(4):318
[13]	Du G W, Cai H Q, Cai J M, et al. Interstitial precipitation in a Fe25Cr5Al alloy. J Mater Sci Lett, 1996, 15(3):258
[15]	Spear W S, Polonis D H. Interstitial precipitation in Fe-Cr-Al alloys. Metall Mater Trans A, 1994, 25(6):1135
[16]	Li W, Lu S, Hu Q M, et al. The effect of Al on the 475℃ embrittlement of Fe-Cr alloys. Comput Mater Sci, 2013, 74:101
[17]	Chandra D, Schwartz L H. M ssbauer effect study of the 475℃ decomposition of Fe-Cr. Metall Trans, 1971, 2(2):511
[18]	Blackburn M J, Nutting J. Metallography of an iron-21% chromium alloy subjected to 475℃ embrittlement. J Iron Steel Inst, 1964, 202(7):610
[19]	Grobner P J. The 885°F (475℃) embrittlement of ferritic stainless steels. Metall Trans, 1973, 4(1):251
[20]	Sahu J K, Krupp U, Ghosh R N, et al. Effect of 475℃ embrittlement on the mechanical properties of duplex stainless steel. Mater Sci Eng A, 2009, 508(1-2):1
[22]	Kobayashi S, Takasugi T. Mapping of 475℃ embrittlement in ferritic Fe-Cr-Al alloys. Scr Mater, 2010, 63(11):1104
[23]	Kim Y J, Chumbley L S, Gleeson B. Determination of isothermal transformation diagrams for sigma-phase formation in cast duplex stainless steels CD3MN and CD3MWCuN. Metall Mater Trans A, 2004, 35(11):3377
[24]	Ejenstam J, Thuvander M, Olsson P, et al. Microstructural stability of Fe-Cr-Al alloys at 450-550℃. J Nucl Mater, 2015, 457:291