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用金相法并结合Ｘ射线衍射（ＸＲＤ）分析研究了１８Ｍｎ－１８Ｃｒ－０．５Ｎ钢在８００～９５０℃范围内氮化物由奥氏体中等温析出的过程，获得了相应的氮化物等温析出动力学曲线。结果表明，对于１８Ｍｎ－１８Ｃｒ－０．５Ｎ钢，在９５０℃以上无氮化物析出，Ｃｒ２Ｎ等温析出的鼻尖温度约为８６０℃，其不析出的临界冷却速度约为０．７５℃／ｓ，Ｃｒ２Ｎ析出量（ｘＶ／％）与奥氏体点阵常数（ａγ／ｎｍ）的关系为ｘＶ＝－９２３１２＋５１３６８３ａγ－７１４５０３ａ２γ。
The process of isothermal precipitation of nitrides from austenite in the range of 800-950 ℃ was studied by metallographic method and X-ray diffraction (XRD). The isothermal precipitation kinetics of nitrides curve. The results show that for the 18Mn-18Cr-0.5N steel, the tip temperature of precipitation of Cr2N is about 860 ℃ and the non-precipitation critical cooling rate is about 0.75 ℃ / s for the precipitation of nitrides above 950 ℃. Cr2N The relationship between the amount of precipitation (xV /%) and the austenite lattice constant (aγ / nm) is xV = -92312 + 513683aγ-714503a2γ.