Nb-Mo-V微合金钢固溶后在450 ~ 650℃温度下回火不同时间,利用透射电镜(TEM)和三维原子探针(3DAP)对不同温度回火硬度峰值样品的显微组织及碳化物进行分析.结果表明:回火温度越高,样品硬度达到峰值所需的回火时间越短;析出强化效果最佳时合金碳化物的等效半径约1.0 nm,数量密度约2.0×1024 m-3;450℃样品中碳化物是以Nb4C3为核心,在渗碳体中原位形核而成,合金元素与碳原子配比接近4:3;500 ~ 650℃样品中碳化物的合金元素和碳原子形成团簇、偏聚分布在基体中,并未形成独立晶体结构和稳定元素化学计量配比.
参考文献
[1] | E.V. Pereloma;I. B. Timokhina;K.F. Russell .Characterization of Clusters and Ultrafine Precipitates in Nb-containing C-Mn-Si Steels[J].Scripta materialia,2006(3):471-476. |
[2] | Mishra S K;Das S;Ranganathan S .Precipitation in high strength low alloy steel:a TEM study[J].Materials Science and Engnieerin A,2002,233:285-292. |
[3] | Mulholland M D;Seidman D N .Multiple dispersed phases in high-strength low-carbon steel:An atom-probe tomographic and synchrotron X-ray diffraction study[J].Scripta Materialia,2009,60:992-995. |
[4] | Chen Zhu;Alfred Cerezo;George D.W. Smith .Carbide characterization in low-temperature tempered steels[J].Ultramicroscopy,2009(5):545-552. |
[5] | Gtündüz S;Cochrane R C .Influence of cooling rate and tempering on precipitation and hardenss of vanadium microalloyed steel[J].Materials and Design,2005,26:486-492. |
[6] | S.G. Hong;H.J. Jun;K.B. Kang .Evolution of precipitates in the Nb-Ti-V microalloyed HSLA steels during reheating[J].Scripta materialia,2003(8):1201-1206. |
[7] | Isheim D;Kolli RP;Fine ME;Seidman DN .An atom-probe tomographic study of the temporal evolution of the nanostructure of Fe-Cu based high-strength low-carbon steels[J].Scripta materialia,2006(1):35-40. |
[8] | Isheim D;Gagliano M S;Fine M E et al.Interfacial segregation at Cu-rich precipitates in a high-strength low-carbon steel studied on a sub-nanometer scale[J].ACTA MATERIALIA,2006,54(03):841-849. |
[9] | 王泽民,朱晓勇,刘文庆.Mo对Nb-Mo-V微合金化钢中碳化物析出的影响[J].材料研究学报,2010(02):217-222. |
[10] | 刘庆冬,刘文庆,王泽民,周邦新.Nb-V微合金钢中碳化物析出的三维原子探针表征[J].金属学报,2008(07):786-790. |
[11] | 刘庆冬,刘文庆,王泽民,周邦新.回火马氏体中合金碳化物的3D原子探针表征Ⅰ.形核[J].金属学报,2009(11):1281-1287. |
[12] | 刘庆冬,彭剑超,刘文庆,周邦新.回火马氏体中合金碳化物的3D原子探针表征Ⅱ.长大[J].金属学报,2009(11):1288-1296. |
[13] | Miller M K.Atom Probe Tomography:analysis at the atomic level[M].New York:Kluwer Academic/Plenum Publishers,2000:25-27. |
[14] | 雍岐龙.钢铁材料中的第二相[M].北京:冶金工业出版社,2006:59. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%