根据本文作者以前的结果,对一种成分为29.4％Mn,3.8％Al,1.9％Mo,0.5％V,0.4％W,0.015％B,0.03％N,0.1％C的奥氏体耐热钢进行了下述研究: (1)热加工塑性:Fe-Mn-Al奥氏体耐热钢的高温可塑性类似于1Cr18Ni9Ti。 (2)持久强度:在600—700℃,数千小时的持久强度接近于ЭИ257T(14％Cr,14％Ni,2.15％W,0.5％Mo,0.5％Ti,0.1％C)的水平。 (3)时效过程的变化:观察并测定了在600—750℃,保温长达9500小时时效过程中的金相组织变化、沉淀相的类型、冲击功及硬度的变化。在时效过程中顺序沉淀出V_4C_3,M_6C及Laves相,时效变脆的倾向不很大。 各种实验结果表明,为节约铬与镍,Fe-Mn-Al奥氏体耐热钢有研究发展的前途,但最大弱点是抗电化学腐蚀能力差,这有待进一步寻求解决途径。 同时,指出由Fe-Mn-Al系发展出在630℃左右使用的奥氏体耐热钢是可能的。
On the basis of our previous investigation, an Fe-Mn-Al steel containing 29.4％Mn, 3.8％ Al, 1.9％ Mo, 0.5％ V, 0.4％ W, 0.015％ B, 0.03％ N and 0.1％ C hasbeen studied systematically. Its workability is similar to that of 1Cr_(18)Ni_9Ti. The stress-rupture properties arecomparable to those of high Cr-Ni austenitic steels, such as ЭИ257Т (14％ Cr, 14％ Ni,2.15％ W, 0.5％ Mo, 0.5％ Ti, 0.1％ C) at 600°and 650℃ for several thousandhours. On ageing at temperatures from 600°to 750℃ for periods up to 9500 hours, ac-companied by changes in hardness, the following phases appeared with increasing ageingtime and temperature: γ V_4C_3, M_6C and AB_2 (Laves phase). The impact value de-creased from about 37 to 10 kg·m/cm~2 after 9500 hours at 650°and 700℃.
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