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| HOT CORROSION OF SINGLE-CRYSTAL SUPERALLOY DD3 |
| Zhang Yuanhu;Fang Wei;Cao Peng;Zhang Kai(Shanghai Jiao Tong University)Wu Zhongtang;Gui Zhonglou;Dai Xiuyan;Lao Riling(Institute of Aeronautical Materials;Beijing) |
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Abstract Hot corrosion behavior of singlecrystal superalloy DD3 in air at 900℃ was studied using specimens coated with po(wt.)Na2SO4+10(wt.%)NaCl.The kinetic processes consisted of three stages.The basic fluxing of metal/oxide predominated in stage Ⅰ.Stage Ⅱ was a transitional process form basic fluxing to acidic fluxing.The presence of W and Mo oxidex at corrosion front during stage Ⅲ showed acidic fluxing reaction.Optical microscopy,electron scanning microscopy and EPMAwere employed for the micro-morphology study of hot corrosion.After corrosion test for an hour,some bubbles were observed on the surface of the superalloy.The corrosion product was in the form of loose scale thickening with time.A specimen of 3mm thickness crumbled seriously into powder after 100 hours hot corrosion. These results indicated that the hot corrosion of single-crystal supperalloy DD3 was catastrophic.
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Received: 25 June 1995
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Cite this article:
Zhang Yuanhu;Fang Wei;Cao Peng;Zhang Kai(Shanghai Jiao Tong University)Wu Zhongtang;Gui Zhonglou;Dai Xiuyan;Lao Riling(Institute of Aeronautical Materials;Beijing). HOT CORROSION OF SINGLE-CRYSTAL SUPERALLOY DD3. J Chin Soc Corr Pro, 1995, 15(3): 223-228.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1995/V15/I3/223
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| 1吴仲棠,温仲元,陈德厚．金属学报,1987,23(4):B1712张允书,李连方,石声泰．中国腐蚀与防护学报,1990,10(4):275-2863BornsteinNS,DecescenteMA．Thans．TMS-AIME,1969,245:1947-524HoncockP．Corr．Sci．1978,18:527-5535BarkalowRH,PettitFS．inProc．ofthe4thconf．onGasTurbineMaterialsinMarineEnvironment,1979,493-523 |
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