摘要
通过形变加工和长期时效热处理 ,研究了 (C +N)复合强化的Fe 13Cr 17Mn(W ,V)奥氏体合金的稳定性和相平衡特点。结果表明 :在 50 0℃以下合金奥氏体稳定 ,不发生γ→α转变。采用 (C +N)复合添加晶粒细化 ,可有效抑制ε马氏体形成和σ相析出。 50 0～ 70 0℃长期时效后形变诱发大量碳化物析出 ,MS 点提高 ,加快形变诱发α′马氏体分解和再结晶 ,促使γ→α转变和σ相析出 。
Phase stability and characterization of phase equilibrium in a (C+M) strengthening austenitic alloy have been investigated by meams of cold\|working and long term aging treatment. Experimental results show that the alloying austenite is stability below 500℃ and γ→α transformation does not occur. The γ grain was fined by combined addition C and N to alloy. With grain refining the formation of ε martensite and σ phase precipitation were effectively suppressed. During the high temperatures (500～700℃) long term aging due to the deformation a large amounts of coarse carbides were precipitated,the M S point was raised and the deformation induced α′ martensite was decomposed and recrystallized quickly.All these promote the γ→α transformation and σ phase precipitation, therefor alloying austenite phase turned unstability.
基金
国家自然科学基金资助!(P80405560)
