随着汽车行业的发展,汽车排气系统热端用铁素体不锈钢的使用温度越来越高,高温性能成为限制其发展的关键性能.研究铌含量对铁素体不锈钢组织与高温性能的影响可以指导钢种设计和工业化生产.选取了2种17%Cr超纯铁素体不锈钢进行高温时效试验,结果表明:铌的质量分数为0.2%时,铌没有明显的强化作用,950℃高温下晶粒迅速长大,高温强度迅速降低;铌的质量分数为0.4%时,在950℃高温下时效,材料中析出弥散第二相粒子Fe2Nb,阻止晶粒长大,提高强度,防止高温引起的材料软化.材料的高温强度是由固溶铌以及铌析出物的共同作用引起的,当固溶铌析出形成析出物时,固溶铌含量减少引起的强度降低以及析出引起强度升高的竞争导致了材料的强度变化.
参考文献
| [1] | Nakamura S;Miyazaki K;Uematsu Y .Effects of Alloying Elements on High-Temperature Strength and Oxidation Resistance of Heat-Resisting Ferritic Stainless Steels for Exhaust Manifold[J].Current Advancements in Molecular Medicines,1991,4:1788. |
| [2] | Fujita N.;Ohmura K.;Yamamoto A. .Changes of microstructures and high temperature properties during high temperature service of Niobium added ferritic stainless steels[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):272-281. |
| [3] | Fujita N;Ohmura K;Kikuchi M et al.Effect of Nb on HighTemperature Properties for Ferritic Stainless Steel[J].Scripta Materialia,1996,35:705. |
| [4] | Gyu Man Sim;Jae Cheon Ahn;Seung Chan Hong et al.Effect of Nb Precipitation Coarsening on the High Temperature Strength in Nb Containing Ferritic Stainless Steels[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2005,396:159. |
| [5] | Fujita N;Bhadeshia HKDH;Kikuchi M .Precipitation sequence in niobium-alloyed ferritic stainless steel[J].Modelling and simulation in materials science and engineering,2004(2):273-284. |
| [6] | Fujita N;Bhadeshia H;Kikuchi M .Modeling M6C Precipitation in Niobium-Alloyed Ferritic Stainless Steel.Modelling[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2002,33A:3339. |
| [7] | Robert G;Nooning Jr;Isaac Garcia C.Role of Stabilization in Improving the Microstructure and Properties of Hot Band in Type 409 Ferritic[J].Stainless Steel World,2001 |
| [8] | Gladman T .On the Theory of the Effect of Precipitate Particles on Grain Growth in Metals[J].Proceedings of the Royal Society of London,1966,294A:298. |
| [9] | 孟繁茂;付俊岩.现代不锈钢中的铌和含铌不锈钢,铌在钢中的应用[A].北京,1997 |
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%