从热力学角度计算了实验钢贝氏体相变温度,分析了不同温度贝氏体相变规律,揭示了相变过程残留奥氏体的稳定性,提出了一种两步短时贝氏体处理方法.实验结果表明:贝氏体相变的鼻尖温度在300 ～350℃之间,综合考虑相变时间和硬度,选取250℃进行等温处理为最佳工艺;在250℃保温20 min时,存在残留奥氏体含量的最大值,保温时间大于20 min后其稳定性提高,在后续的冷却过程中不发生马氏体相变;在250℃等温处理50 min后升温到270℃保温5 min,相变时间为传统工艺的27％左右,显著缩短贝氏体相变时间的同时并未明显降低硬度和磨损性能.
参考文献
| [1] | H.K.D.H. Bhadeshia.Steels for bearings[J].Progress in materials science,20122(2):268-435. |
| [2] | Luzginova, NV;Zhao, L;Sietsma, J.Bainite formation kinetics in high carbon alloyed steel[J].Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008:766-769. |
| [3] | M. Kang;M.-X. Zhang;M. Zhu.In situ observation of bainite growth during isothermal holding[J].Acta materialia,20068(8):2121-2129. |
| [4] | B.A. Szost;R.H. Vegter;P.E.J. Rivera-Diaz-del-Castillo.Developing bearing steels combining hydrogen resistance and improved hardness[J].Materials & design,2013Jan.(Jan.):499-506. |
| [5] | B.A. SZOST;R.H. VEGTER;PEDRO E.J. RIVERA-DIAZ-DEL-CASTILLO.Hydrogen-Trapping Mechanisms in Nanostructured Steels[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,201310(10):4542-4550. |
| [6] | J.Dong;H.Vetters;H.-W.Zoch.Shortening the Duration of Heat Treatment in the Lower Bainitic Range[J].材料热处理学报,2004(05):555-560. |
| [7] | Thomas Sourmail;Veronique Smanio.Low temperature kinetics of bainite formation in high carbon steels[J].Acta materialia,20137(7):2639-2648. |
| [8] | A.T.W. Barrow;P.E.J. Rivera-Diaz-del-Castillo.Nanoprecipitation in bearing steels[J].Acta materialia,201119(19):7155-7167. |
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%