借助金相显微镜、扫描电镜分析能谱,显微硬度仪,通过改变高铬铸铁(Cr15)凝固冷却速率,研究冷速对初生奥氏体稳定性的影响.结果表明:随着冷却速率增加,共晶组织含量先增加后减少,初生奥氏体量呈先减少后增加的趋势演变;初生奥氏体中固溶的C、Cr含量增加,奥氏体的过饱和度增大,当二次碳化物未析出时,初生奥氏体稳定性增加,一旦二次碳化物析出,其稳定性降低;初生奥氏体向马氏体转变数量减少,稳定性增强;共晶奥氏体和初生奥氏体边缘部位不稳定,最先发生A→M转变.
参考文献
[1] | 周庆德;饶启昌;苏俊义.铬系抗磨铸铁[M].西安:西安交通大学出版社,1986:58-78. |
[2] | 王兆昌;周年.奥氏体白口铸铁与马氏体白口铸铁的磨料磨损行为及抗磨性能[J].铸造,1993(09):24-28. |
[3] | Sare I R.Abrasion resistance and fracture toughness of white cast iron[J].Metals-Technology,1972(1 1):412-419. |
[4] | P. Amorim;H. Santos;J. Santos .Soft Annealing of High Chromium White Cast Iron[J].Materials Science Forum,2004(0):290-294. |
[5] | Maratray F;Poulalion A.Austenite retention in high-chromium white irons[J].Giessereipraxis,1983(13/14):205-214. |
[6] | Matsuo T T;Kasama A H;Kiminami C S et al.Retained austenite in spray formed high chromium white cast iron[J].Journal of Metastable and Nanocrystalline Materials,2004,20/21:297-302. |
[7] | Cias W W .Austenite transformation kinetics and hardenability of heat-treated 17.5%Cr white cast irons[J].Transactions of the American Fisheries Society,1974,82:317-328. |
[8] | 皇志富,张安峰,邢建东,黄卫东,高义民.半固态高铬铸铁初生相的形貌及其定量分析[J].铸造技术,2005(06):453-455. |
[9] | 郝石坚.高铬耐磨铸铁[M].北京:煤炭工业出版社,1993:116. |
[10] | 陈景琚;余自甦.合金高铬铸铁及其应用[M].北京:冶金工业出版社,1999:21. |
[11] | J.S.Park;J.D.Verhoeven .Directional Solidification of White Cast Iron[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1996(8):2328-2337. |
[12] | 苏应龙;张学昆;马黛妮 .高铬抗磨铸铁韧性的提高[J].北京工业大学学报,1998,24(01):71-76. |
[13] | Laird G;Powell G L F .Solidification and solid-state transformation mechanisms in Si alloyed high-chromium white cast irons[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1993,24(04):981-988. |
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%