18Mn-18Cr-0.5N钢氮化物等温析出动力学研究  

INVESTIGATION ON ISOTHERMAL PRECIPITATION KINETICS OF NITRIDES IN 18Mn 18Cr 0 5N STEEL

作　　者：傅万堂[1,2] 王正[1,2] 刘文昌 郑炀曾[1,2] 马建国 

机构地区：[1]燕山大学 [2]哈尔滨电缆桥架厂

出　　处：《钢铁》1998年第9期45-48,共4页Iron and Steel

摘　　要：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 isothermal precipitation process of nitrides in 18Mn 18Cr 0 5N steel within the range from 800 to 950 ℃ was investigated by the use of metallography and XRD analysis The corresponding isothermal precipitation kinetics curve of nitrides was obtained The results show that for 18Mn 18Cr 0 5N steel,the precipitation of nitrides does not take place over 950 ℃ The nose top temperature of Cr 2N precipitation is about 860 ℃,and the critical cooling rate of disprecipitation of Cr 2N is 0 75 ℃/s The larger the amount of precipitated nitrides(x V/%),the smaller the lattice parameter of austenite(a γ/nm)is The relationship between x V and a γ is x V=-92 312+513 683 a γ-714 503 a 2 γ

关 键 词：高氮钢 氮化物 等温析出动力学 

分 类 号：TG142[一般工业技术—材料科学与工程]