龚帅,任学冲,马英霞,高克玮,江波,陈刚,赵海

• 1:北京科技大学国家材料服役安全科学中心
• 2:北京科技大学材料科学与工程学院
• 3:马鞍山钢铁股份有限公司技术中心

摘要(Abstract)：

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。

关键词(KeyWords)： 车轮钢;热处理;显微组织;断裂韧性;解理断裂

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51171020,U1234207);; 中央高校基本科研业务费专项资金(FRF-TP-12-160A)

作者(Author): 龚帅,任学冲,马英霞,高克玮,江波,陈刚,赵海

DOI: 10.13289/j.issn.1009-6264.2015.04.026

参考文献(References)：

• [1]European Standard,NF EN 13262+A1:2009-01[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(8):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,等.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,2012,33(1):93-97.REN Xue-chong,LI Sheng-jun,GAO Ke-wei,et al.The relationship between fracture toughness and impact toughness of high-speed wheel steel at room temperature[J].China Railway Science,2013,33(1):93-97.
• [6]Sakamoto H,Toyama K,Hoirakawa K.Fracture toughness of medium-high carbon steel for railroad wheel[J].Materials Science and Engineering A,2000,285(1):288-292.
• [7]任学冲,李胜军,高克玮,等.热处理工艺对CL50D车轮钢晶粒度的影响[J].金属热处理,2012,37(7):7-12.REN Xue-chong,LI Sheng-jun,GAO Ke-wei,et al.Effects of heat treatment process on grain size of wheel steel of CL50D[J].Heat Treatment of Metals,2012,37(7):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,2010,8(4):33-36.WANG Li-ying,LI Wei.KQtest result and analysis of ER7 railway wheel steel[J].Physics Examination and Testing,2010,8(4):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]Holzmann M,Jurasek L,Dlouhy I.Fracture behavior and cleavage initiation in hypoeutectoid pearlitic steel[J].International Journal of Fracture,2007,148(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(6):395-410.
• [12]Chen J H,Li G,Cao R,et al.Micromechanism of cleavage fracture at the lower shelf transition temperature of a C-Mn steel[J].Materials Science and Engineering A,2010,527(18):5044-5054.
• [13]任学冲,田建军,王国珍,等.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,2004,26(5):533-537.REN Xue-chong,TIAN Jian-jun,WANG Guo-zhen,et al.Influence of Loading rate on fracture behavior of notched specimens made of low alloy steel[J].Journal of University of Science and Technology Beijing,2004,26(5):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,2004,35:1765-1778.
• [15]Curry D A,Knott J F.Effect of microstructure on cleavage fracture stress in steel[J].Metal Science,1978,12(11):511-514.
• [16]Chen J H,Wang Q,Wang G Z,et al.Fracture behavior at crack tip—a new framework for cleavage mechanism of steel[J].Acta Materialia,2003,51(7):1841-1855.
• [17]Wang G Z,Chen J H,Wang J G.On the measurement and physical meaning of the cleavage fracture stress in steel[J].International Journal of Fracture,2002,118(3):211-227.

文章评论(Comment)：