在扭转疲劳试验中,非调质钢FAS2340半轴零件性能比调质钢42CrMoH零件高出50%以上。为研究其原因,对上述两种半轴零件进行了研究。金相观察发现,在感应淬火过程中FAS2340钢中形成大量规则排列的微小质点,经TEM和相分析对比发现,质点主要由未熔解的渗碳体颗粒构成,并且占总数70%以上Fe3C质点尺寸分布在5～9nm范围内。大量的Fe3C质点促进零件表层晶粒细化,并在随后的淬火冷却过程中形成均匀细小的马氏体组织,零件使用性能得到显著提高。
Mechanical properties of Semi-axle of non-quenching and tempering steel（FAS2340） was improved and was 50% higher than quenched and tempered steel（42CrMoH） in torsion fatigue test.In order to clear the reason,two Semi-axles of FAS2340 and 42CrMoH were investigated.Microstructure shows that a large number of reticular small particles are formed in FAS2340 during induction hardening.According to results of TEM and Phase analysis,the small particle is constituted mainly by no-melting cementite particles,and the Fe3C particles（diameter： 5-9 nm） are more than 70%.The austenite grain size of hardened layer is refined accordingly.Then,fine and uniform martensite laths are formed in following quenching process.Performance of parts significantly is increased due to refining microstructure.
参考文献
| [1] | 董瀚.钢铁材料基础研究的评述[J].钢铁,2008(10):1-7. |
| [2] | 应善强,曹正,鹿云,王敢利,马汝忠.汽车后桥半轴用高性能非调质钢的开发及应用研究[J].汽车技术,2009(05):53-56. |
| [3] | 徐祖耀.马氏体相变与马氏体[M].北京:科学出版社,1999 |
| [4] | 王国承,王铁明,尚德礼,方克明.超细第二相粒子强化钢铁材料的研究进展[J].钢铁研究学报,2007(06):5-8. |
| [5] | Gladman T .On the Theory of Precipitate Particles on Grain Growth in Metals[J].Proceedings of the Royal Society of London,1966,A294:298. |
| [6] | Zener C .On the Theory of Precipitate Particles on Grain Growth in Metals[J].Trans Amer Inst Metall Engrs,1949,175:15. |
| [7] | 崔毅,张鹏程,唐荻,黄国建.Nb、V、Ti在微合金钢中回溶规律的研究[J].钢铁钒钛,2007(02):33-36,42. |
| [8] | 翁宇庆.超细晶粒钢-钢的组织细化技术理论与控制技术[M].北京:冶金工业出版社,2003 |
| [9] | 雍岐龙.钢铁材料中的第二相[M].北京:冶金工业出版社,2006 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%