对含碳量为0.54％的高速车轮钢热处理工艺进行实验研究,得到不同晶粒尺寸和珠光体片间距的显微组织,在室温下对具有不同显微组织的紧凑拉伸(CT)试样进行断裂韧性测试.结果表明,车轮钢的平均晶粒尺寸随奥氏体化温度升高而增加;珠光体片间距随冷却速率增加而减小.车轮钢室温下的断裂模式为解理断裂,断裂韧性主要取决于晶粒尺寸的大小,晶粒尺寸越小,断裂韧性越高.珠光体片间距对断裂韧性有一定影响,粗大的珠光体片间距会降低断裂韧性,并且当晶粒尺寸较小时,珠光体片间距的影响更明显.因此,实际工程中为提高车轮钢断裂韧性,合理的奥氏体化温度是关键,同时需适当增加车轮钢奥氏体化后的冷却速率.
参考文献
| [1] | NF EN 13262 + Al:2009-01[S].Railway Applications-Wheelsets and Bogies-Wheels-Product Requirements,2009. |
| [2] | Pickering F B.Constitution and Properties of Steels[M].Weinheim,VCH,1992 |
| [3] | Hyzak J M;Bernstein I M .The role of microstructure on the strength and toughness of fully pearlitic steels[J].Metallurgical Transactions A,1976,7(08):1217-1224. |
| [4] | Alexander D J;Bernstein I M .Cleavage fracture in pearlite eutectoid steel[J].Metallurgical Transactions A,1989,20(11):2321-2335. |
| [5] | 任学冲,李胜军,高克玮,宿彦京,江波,陈刚,赵海.室温下高速车轮钢断裂韧性与冲击韧性的关系[J].中国铁道科学,2012(01):93-97. |
| [6] | Haruo Sakamoto;Kazuo Toyama;Kenji Hirakawa .Fracture toughness of medium-high carbon steel for railroad wheel[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):288-292. |
| [7] | 任学冲,李胜军,高克玮,宿彦京,江波,陈刚,赵海.热处理工艺对CL50D车轮钢晶粒度的影响[J].金属热处理,2012(07):7-12. |
| [8] | 王丽英,李伟.ER7车轮钢的KQ值试验结果与分析[J].物理测试,2010(04):33-36. |
| [9] | Park Y J;Bernstein I M .The process of crack initiation and effective grain size for cleavage fracture in pearlite eutectoid steel[J].Metallurgical Transactions A,1979,10(11):1653-1664. |
| [10] | Miloslav Holzmann;Ladislav Jurasek;Ivo Dlouhy .Fracture behaviour and cleavage initiation in hypoeutectoid pearlitic steel[J].International Journal of Fracture,2007(1):13-28. |
| [11] | Ritchie R O;Knott J F;Rice J R .On the relationship between critical tensile stress and fracture toughness in mild steel[J].Journal of the Mechanics and Physics of Solids,1973,21(06):395-410. |
| [12] | Chen, J.H.;Li, G.;Cao, R.;Fang, X.Y. .Micromechanism of cleavage fracture at the lower shelf transition temperatures of a C-Mn steel[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(18/19):5044-5054. |
| [13] | 任学冲,田建军,王国珍,褚武扬.加载速率对低合金钢缺口断裂行为的影响[J].北京科技大学学报,2004(05):533-537. |
| [14] | Wang G Z;Ren X C;Chen J H .Effects of loading rate on fracture behavior of low alloy steel with different grain size[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2004,35:1765-1778. |
| [15] | Curry D A;Knott J F .Effect of microstructure on cleavage fracture stress in steel[J].Metal Science Journal,1978,12(11):511-514. |
| [16] | J. H. Chen;Q. Wang;G. Z. Wang;Z. Li .Fracture behavior at crack tip - a new framework for cleavage mechanism of steel[J].Acta materialia,2003(7):1841-1855. |
| [17] | G. Z. WANG;J. H. CHEN;J. G. WANG .On the measurement and physical meaning of the cleavage fracture stress in steel[J].International Journal of Fracture,2002(3):211-227. |
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%