金属学报  2007, Vol. 43 Issue (4): 337-343

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高氮奥氏体的中温转变行为

焦东玲;罗承萍;刘江文

华南理工大学机械工程学院

Intermediate-temperature transformation behavior of high-nitrogen austenite generated by nitriding thin pure-iron sheets

华南理工大学机械工程学院

焦东玲; 罗承萍; 刘江文 . 高氮奥氏体的中温转变行为[J]. 金属学报, 2007, 43(4): 337-343 .

摘要 参考文献 相关文章 Metrics 全文: PDF(931 KB)   摘要: 采用OM, XRD, SEM和TEM研究了由纯铁穿透渗氮所得高氮奥氏体经225 ℃中温转变后的显微组织, 确定了转变产物的种类和形态. 等温转变属于γ→α-Fe +γ’-Fe4N上贝氏体转变, 转变产物由α-Fe板条和γ’- Fe4N板条交替排列而成的贝氏体板条团以及离散分布在贝氏体团块间的残余奥氏体γr小团块组成. 该贝氏体相变在晶界和晶内位错线上优先形核、长大, 具有扩散型相变的特征, 其领先相是γ’-Fe4N. γ’-Fe4N与奥氏体晶体结构上的相似性及界面良好的共格性, 保证了γ’-Fe4N从奥氏体的顺利析出. 关键词 ： 纯铁渗氮,  高氮奥氏体,  贝氏体转变     Abstract：Abstract A microstructural study was carried out to clarify the nature and morphology of the microstructure produced in high-nitrogen austenite generated by nitriding thin pure-iron sheets and subjected to an intermediate-temperature isothermal transformation at 225C, using optical microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that an upper bainitic transformation, γ-Fe +γ′-Fe4N, occurred at either the grain boundaries or the dislocation lines in the interior of austenite grains, producing a microstructure which, although morphologically looking markedly different, consisted of bainitic colonies composed of parallel bainitic ferrite (-Fe ) laths with γ′-Fe4N laths entrapped between them, and was interspersed with discrete patches of retained austenite(γr). Transformations occurring at the grain boundaries initiated earlier, proceeded faster, and produced a coarser microstructure, than those occurring in the interior of austenite grains did, due to the difference between the two types of nucleation sites in thermodynamics (nucleation energy) and kinetics (diffusivity). The bainitic transformation was diffusional in nature, with γ′-Fe4N serving as the leading phase. The striking similarity of the γ′-Fe4N to the high-nitrogen austenite in crystal structure, and the good coherence of the γ/γ′-Fe4N interface greatly facilitated the precipitation of γ′-Fe4N from austenite. Key words： nitrided pure-iron sheet    high-nitrogen austenite    intermediate-temperature transformation    bainitic tr 收稿日期: 2006-08-23      ZTFLH:  TG142.3   服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 焦东玲 罗承萍 刘江文 44.8K 链接本文: https://www.ams.org.cn/CN/Y2007/V43/I4/337 [1]Foct J,Rochengude P,Hendry A.Acta Metall,1988;36: 501 [2]Aaronson H I,Reynolds W T,Spanos G.Scr Metall Mater,1990;24:219 [3]Bell T,Kinali M,Munstermann G.Heat Treat Met,1987; 14(2):47 [4]Han K H,Song Y K.Mater Sci Eng,1999;A260:246 [5]Baker H.Metals Handbook.Materials Park,OH:ASM International,1997:198 [6]Bell T,Birch B J,Korotchenko V,Evans S P.In:Metals Society ed,Heat Treatment'73,London:Metals Society, 1975:51 [7]Liu C,Mittemeijer E J.Metall Trans,1990;21A:13 [8]Aaronson H I.The Mechanism of Phase Transformations in Crystalline Solids.London:The Institute of Metals, 1969:270 [9]Luo C P,Weatherly G C,Liu Z Y.Metall Trans,1992; 23A:1403 [10]Heheman R F,Kingsman K R,Aaronson H I.Metall Trans,1972;3:1077 [11]Genin J M,Foct J.Phys Status Solidi,1973;17A:395 [12]Foct J.Compt Rend Hebd Seances Acad Sci,1973;276C: 1159 [13]Gavrilyuk V A,Nadutov V M,Gladun O V.Phys Met Metall,1990;69:129 [14]Ino H,Oda K,Umezu K.J Jpn Inst Met,1989;53:372 (井野博满,小田克郎,梅津清．日本金属学会志,1989;53: 372). [1] 郑椿, 刘嘉斌, 江来珠, 杨成, 姜美雪. 拉伸变形对高氮奥氏体不锈钢显微组织和耐腐蚀性能的影响[J]. 金属学报, 2022, 58(2): 193-205. [2] 彭云,宋亮,赵琳,马成勇,赵海燕,田志凌. 先进钢铁材料焊接性研究进展[J]. 金属学报, 2020, 56(4): 601-618. [3] 万响亮, 胡锋, 成林, 黄刚, 张国宏, 吴开明. 两步贝氏体转变对中碳微纳结构钢韧性的影响[J]. 金属学报, 2019, 55(12): 1503-1511. [4] 王松涛; 杨柯; 单以银; 李来风 . 高氮奥氏体不锈钢与316L不锈钢的冷变形行为研究[J]. 金属学报, 2007, 43(2): 171-176 . [5] 陈汝淑; 刘德义; 刘世程; 刘世永 . 高氮奥氏体钢低温断面的晶体学分析[J]. 金属学报, 2007, 43(12): 1233-1238 . [6] 刘世程; 刘德义; 戴雅康 . 高氮奥氏体钢低温断裂途径与断口形貌[J]. 金属学报, 2002, 38(10): 1042-1046 . [7] 董建新;陈复民;陈金铭;刘文西. Cu-Zn-Al合金逆形状记忆组织的电镜观察[J]. 金属学报, 1990, 26(6): 81-83. [8] 曹仁焕;马洪悌;阎振棨. 低碳Mn-Nb-V和Mn-Mo-Nb-V钢中的贝氏体转变[J]. 金属学报, 1988, 24(2): 135-138. Viewed Full text Abstract Cited   Shared      Discussed