对16Cr14Co12Mo5耐热耐蚀轴承钢在1 050℃高温淬火后,在490～540℃两次回火后的组织性能以及强韧化机制进行研究。结果表明：随着回火温度的升高,抗拉强度Rm逐渐增加,最大时超过了1 900MPa,屈服强度Rp0.2在500℃回火后达到1 400MPa,随后逐渐减小;断面收缩率和伸长率略有减小,而硬度略有增长。材料强韧化主要源于高位错板条马氏体以及其中残余奥氏体薄膜和沉淀析出的碳化物和金属间化合物。采取适宜淬回火工艺制度所导致弥散析出的碳化物和金属间化合物是试样的强度和韧性达到最佳配合的关键。
After quenching at 1050℃, microstructures and Mechanical Properties and mechanism of strength-tough- ening of heat and corrosion resistant bearing steel 16Cr14Co12Mo5 was investigated after 490-540 ℃ double tempe- ring. The results show that the tensile strength Rm gradually increases and its Maximum is above 1 900MPa; the yielding strength Rpo.2 is above 1400 MPa after tempering at 500℃ and then decrease gradually; both A and Z decrease slightly, but HRC increase fairly small. The strength-toughening of material mainly comes of high density dislocation martensitic laths, residual anstenitic between martensitic, precipitation of carbides and intermetallic compounds. The precipitation of carbides and intermetallic compounds, which was the key to achieve the best match between strength and toughness of samples, was obtained through appropriately quenching and tempering technology.
参考文献
| [1] | Crawfird W M;Contractor G P .The Effects of Strengthening Be and Ti in Maraging Stainless Steel[J].JIPI,1969,207(12):1642. |
| [2] | 魏振宇.马氏体时效不锈钢[J].新金属材料,1972(04):22. |
| [3] | 姜越,尹钟大,朱景川,李明伟.马氏体时效不锈钢的发展现状[J].特殊钢,2003(03):1-5. |
| [4] | 赵振业,李志,刘天琦,朱杰远.探索新强韧化机制开拓超高强度钢新领域[J].中国工程科学,2003(09):39-42,54. |
| [5] | 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. |
| [6] | 雍启龙.钢铁结构材料中的第二相[M].北京:冶金工业出版社,2006 |
| [7] | Decker R F;Eash J T;Goldman A J .18% Nickel Maraging Steels[J].Transactions ASM,1962,55(01):58. |
| [8] | 俞德刚.钢的强韧化理论与设计[M].上海:上海交通大学出版社,1990 |
| [9] | 凌斌,钟平,钟炳文.新型二次硬化高Co-Ni超高强度钢强韧化机制的研究[J].航空学报,1997(01):44. |
| [10] | 赵振业.超高强度钢中二次硬化现象研究[J].航空材料学报,2002(04):46-55. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%