Effects of graphite nodule diameter on the water embrittlement of austempered ductile iron (ADI) is studied. The water embrittlement mechanism is discussed. Due to water adhesion, local embrittlement occurs on the surface of ADI specimen, resulting in early fracture and significant reduction in tensile strength and elongation. The water embrittlement is the cracking of stress induced martensite formed during tensile deformation caused by hydrogen diffusion decomposed from water and as a result tensile strength and elongation of ADI are remarkably reduced. The segregation of alloying elements in ductile iron is weakened with decreasing nodule diameter, reducing the residual austenite in grain boundaries, then decreasing the amount of stress induced martensite during tensile plastic deformation and finally restraining ADI water embrittlement.
参考文献
| [1] | Morrogh J H;Williams W J .Graphite Formation in Cast Iron and in Nickel-Carbon and Cobalt-Carbon Alloys[J].Journal of the Iron and Steel Institute,1947,155:321-371. |
| [2] | Johansson M .Austenitic-Bainitic Ductile Iron[J].AFS Transactions,1977,85:117-122. |
| [3] | Tanaka Y;Kage H .Development and Application of Austempered Spheroidal Graphite Cast Iron[J].Materials Transactions,1992,33:543-557. |
| [4] | Moore D J;Brouns T N;Rundman K B .The Relationship between Microstructure and Tensile Properties in Austempered Ductile Iron[J].AFS Transactions,1987,95:765-774. |
| [5] | SHIH T S;Chang C H .Mechanical Properties and Microstructure of Copper Alloyed ADI[J].AFS Transactions,1993,101:857-872. |
| [6] | Dorazil E;Barta B;Munsterova E et al.High-Strength Bainitic Ductile Cast Iron[J].AFS International Casting Metals Journal,1982,7:52-62. |
| [7] | Komatsu S;Shiota T;Nakamura K .Influence of Graphite Shape on Fracture Toughness and Its Transition Behavior of Ferritic Cast Iron[J].IMONO,1987,59:159-163. |
| [8] | Rao P P;Putatunda S K .Influence of Microstructure on Fracture Toughness of Austempered Ductile Iron[J].Metallurgical and Materials Transactions,1997,28A:1457-1470. |
| [9] | Rao P P;Putatunda S K .Dependence of Fracture Toughness of Austempered Ductile Iron on Austempered Ductile Iron[J].Metallurgical and Materials Transactions,1998,29A:3005-3016. |
| [10] | Putatunda S K .Fracture Toughness of a High Carbon and High Silicon Steel[J].Materials Science and Engineering,2001,297A:31-43. |
| [11] | G. L. Greno;J. L. Otegui;R. E. Boeri .Mechanisms of fatigue crack growth in austempered ductile iron[J].International Journal of Fatigue,1999(1):35-43. |
| [12] | Shanmugam P;Rao P P;Udupa K R et al.Effect of Microstructure on the Fatigue Strength of an Austempered Ductile Iron[J].Journal of Materials Science,1994,29:4933-4940. |
| [13] | Chih-Kuang Lin;Chun-Shyang Fu .Low-Cycle Fatigue of Austempered Ductile Irons in Various -Sized Y-Block Castings[J].Materials transactions,1997(8):692-700. |
| [14] | Zhou W S;ZHOU D Q;MENG S K .Abrasion Resistance of Austempered Ductile Iron[J].Cast Metals,1993,6:69-75. |
| [15] | Hemanth J .Wear Characteristic of Austempered Chilled Ductile Iron[J].Materials & Design,2000,21:139-148. |
| [16] | Shibutani S;Tanaka Y .Embrittlement in Austempered Spheroidal Graphite Cast Iron Caused by Water and Its Controlling Method[J].Journal of Japanese Foundry Engineering Society,1998,70:115-120. |
| [17] | Tanaka Y;Shibutani S;XU Zhi-sheng .Environment Embrittlement of Austempered Spheroidal Graphite Cast Iron by Exposure to Water[J].Journal of Japanese Foundry Engineering Society,1998,70:193-199. |
| [18] | Martinez R A;Boeri R E;Sikora J A .Embrittlement of Austempered Ductile Iron Caused by Contact with Water and Other Liquids[J].International Journal of Metals Reviews,2000,13:9-16. |
| [19] | Tanaka Y;Ishii H .Effect of the Graphite Nodule Size on Fatigue Properties of Austempered Spheroidal Graphite Cast Iron[J].IMONO,1991,63:699-705. |
| [20] | Ikenaga A;Kawamoto M;Nitta T et al.Effect of Graphite Nodule Size on Corrosion Resistance of Borided Spheroidal Graphite Cast Iron[J].Journal of Japanese Foundry Engineering Society,1996,68:228-234. |
| [21] | Tsai WT;Chou S.-L. -- .Hydrogen embrittlement of duplex stainless steel in concentrated sodium chloride solution[J].Materials Chemistry and Physics,1999(2):137-142. |
| [22] | N. Eliaz;A. Shachar;B. Tal .Characteristics of hydrogen embrittlement, stress corrosion cracking and tempered martensite embrittlement in high-strength steels[J].Engineering failure analysis,2002(2):167-184. |
| [23] | Kimura A;Izumi H;Misawa T et al.Critical Pressures of Water Vapor and Hydrogen Gas Causing Intergranular Brittle Fracture of Co3Ti at Room Temperature[J].Materials Transactions,1994,35:879-887. |
| [24] | ZHANG De-zhi;XIAO Ji-mei .Environmental Embrittlement of Intermetallic Compounds[J].材料科学与工程学报,1998,16(02):14-18 . |
| [25] | KAGE H;Hiraoka T;Kamide H et al.Effect of Graphite Nodule Size on Tensile Properties of Austempered Spheroidal Graphite Cast Iron[J].IMONO,1990,62:543-548. |
| [26] | Yeung C F;Zhao H;Lee W B .The Morphology of Solidification of Thin-Section Ductile Iron Castings[J].Materials Characterization,1998,40:201-208. |
| [27] | Tsubakino H;Harada H .Effect of Retained Austenite on the Hydrogen Permeation Behavior in High Strength Steels[J].Tetsu To Hagane-Journal of The Iron and Steel Institute of Japan,1997,83:587-592. |
| [28] | Hirth J P .Effect of Hydrogen on the Properties of Iron and Steel[J].Metallurgical and Materials Transactions,1980,11A:861-890. |
| [29] | Terasaki F;Takano N .Mechanism of Hydrogen Embrittlement in Iron and Low Strength Steels[J].Materia Japan(in Japanese),1994,33:922-931. |
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