【作者】 李翀；

【导师】 杨世伟；

【作者基本信息】 哈尔滨工程大学 ， 材料学， 2004， 硕士

【摘要】 为了提高航空发动机叶片材料1Cr11Ni2W2MoV马氏体热强钢的使用温度,本文对其进行了热浸镀Al-6%Si-4%Re处理。根据GB/T13303-91标准,对浸镀件与未镀件进行700℃×600h高温氧化腐蚀试验;运用SEM、EMPA、OM等分析检测方法对浸镀层高温氧化时的成分、组织结构、表面形貌及镀层失效成因进行了系统的研究。 从Wanger氧化经验公式出发,运用离散数据拟合法计算氧化动力学方程,即浸镀件的氧化动力学方程(W=0.117t^0.333)和未镀件的氧化动力学方程(W=0.0902t^0.408);采用Origin软件绘制氧化动力学曲线。结果表明,1Cr11Ni2W2MoV马氏体热强钢浸镀件与未镀件在700℃×600h高温氧化动力学曲线均趋于抛物线规律。浸镀件的氧化速率明显小于未镀件,其抗高温氧化腐蚀性能高于未镀件。 试验结果表明,浸镀件700℃氧化600h表面形成具有一定厚度致密、连续的α-Al₂O₃氧化膜,其是浸镀件抗高温氧化的屏障。浸镀层由Fe₂Al₅相和FeAl₃相转变为FeAl相,为表层形成致密、连续的Al₂O₃氧化膜及固溶扩散带的形成提供了有力保证。Si元素与合金元素形成的第二相质点在整个高温氧化腐蚀过程中起到了关键的作用。氧化膜生长时产生的本征压应力、扩散层内的空洞和基体表面粗糙度是氧化膜Al₂O₃开裂及剥落的主要原因。更多还原

【Abstract】 In order to improve application temperature of aerial engine blade materials heat resistant martensitic steel 1Cr11Ni2W2MoV, it was hot-dipped Al-6%Si-4%Re. According to GB/T13303-91 criterion, 1Cr11Ni2W2MoV steel with coating and without coating was oxygenated at 700℃ for 600h.This article researched systemically on the composition, the microstructure and the surface of 1Cr11Ni2W2MoV steel with coating and the reason of coating invalidation after observing with SEM、 EMPA、 OM.According to Wanger oxidation experience formula, using the scatter date simulation computing method had gained tow oxidation kinetics equations: one is W=0.117t⁰.333（with coating）, the other is W=0.0902t⁰.408（raw materials）. Oxidation kinetics curve is drawn by Origin software. Conclusion disclosed these oxidation kinetics curves regularity is similar to parabola regularity. Prosperity of resistance oxidation of hot-dipped steel is better than that of lCrllNi2W2MoV steel without hot-dipped.The research showed the surface of hot-dipped Al-Si-Re lCrllNi2W2MoV heat resistant martensitic steel could obtain compact and uninterrupted α-A1₂O₃ film after it was oxygenated at 700℃ for 600h. It is the barrier that can resist high temperature, oxidation. Phases in its coating changed from Fe₂Al₅ and FeAl₃ into FeAl, which could afforded a lot of Al³+ for forming compact and uninterrupted α -Al₂O₃ film.Si element and alloy element can form the second phase. It is important during high temperature oxidation corrosion. Press wereformed when oxidation film was developing, inanition in the diffussion layer and the surface Ra of raw materials were the cause that A12O3 film had crazed and desquamated .更多还原