徐平伟,梁益龙,黄朝文

• 1:贵州大学材料与冶金学院
• 2:贵州省材料结构与强度重点实验室

摘要(Abstract)：

采用850℃至1200℃的淬火温度,探索了奥氏体晶粒尺寸对52CrMoV4弹簧钢强韧性的影响。通过光学金相和扫描电镜观察了显微组织和断口形貌及断裂路径。结果表明,随着晶粒的粗化,强度变化很小,拉伸塑性呈线性降低,断裂韧度和冲击韧度呈现先降后增的反常趋势。晶粒尺寸和马氏体束尺寸是影响拉伸塑性的重要因素,而断裂韧度和冲击韧度与晶界状况和马氏体条的宽长比有关。

关键词(KeyWords)： 奥氏体晶粒;马氏体;断裂韧度;强韧性;弹簧钢

Abstract:

Keywords:

基金项目(Foundation): 国家科技支撑计划(2007BAE11B03);; 黔科合重大专项字(2006)6029

作者(Author): 徐平伟,梁益龙,黄朝文

DOI: 10.13289/j.issn.1009-6264.2012.01.016

参考文献(References)：

• [1]Wang C F,Wang M Q,Shi J,et al.Effect of microstructure refinement on the strength and toughness of low alloy martensitic steel[J].Journal of Materials Science&Technology,2007,23(5):659-664.
• [2]Kumar A S,Kumar B R,Datta G L,et al.Effect of microstructure and grain size on the fracture toughness of a micro-alloyed steel[J].Materials Science and Engineering:A,2010,527(4-5):954-960.
• [3]Zackay V F,Parker E R,Goolsby R D,et al.Untempered ultra-high strength steels of high fracture toughness[J].Nature,1972,236(68):108-109.
• [4]Lee S,Majno L,Asaro R J.Correlation of microstructure and fracture toughness in two4340steels[J].Metallurgical and Materials Transactions A,1985,16(9):1633-1648.
• [5]梁益龙,雷旻,钟蜀辉,等.板条马氏体钢的断裂韧性与缺口韧性拉伸塑性的关系[J].金属学报,1998,34(9):950-958.LIANG Yi-long,LEI Min,ZHONG Shu-hui,et al.The relationship between fracture toughness and notch toughness,tensile ductilities in lath martensite steel[J].Acta Metallurgica Sinica,1998,34(9):950-958.
• [6]Tomita Y.Effect of microstructure on plane-strain fracture toughness of AISI4340steel[J].Metallurgical and Materials Transactions A,1988,19(10):2513-2521.
• [7]梁益龙,钟蜀辉,唐道文,等.35SiMnMoV钢的显微组织参量在断裂过程中的作用[J].金属热处理学报,1999,20(4):11-17.LIANG Yi-long,ZHONG Shu-hui,TANG Dao-wen,et al.The roles of microstructural parameters in fracture for35SiMnMoV steel[J].Transactions of Metal Heat Treatment,1999,20(4):311-317.
• [8]Tomita Y.Improved lower temperature fracture toughness of ultrahigh strength4340steel through modified heat treatment[J].Metallurgical and Materials Transactions A,1987,18(8):1495-1501.
• [9]戴起勋.金属材料学[M].北京:化学工业出版社,2005.
• [10]Wood W E.Effect of heat treatment on the fracture toughness of low alloy steels[J].Engineering Fracture Mechanics,1975,7(2):219-228.
• [11]Chaudhuri S K,Brook R.Influence of prior-austenite grain size and fracture mode on the fracture toughness of12%Cr steel[J].International Journal of Fracture,1976,12(1):101-106.
• [12]俞德刚,谈育煦.钢的组织强度学:组织与强韧性[M].上海:上海科学技术出版社,1983.
• [13]钟群鹏,赵子华.断口学[M].北京:高等教育出版社,2006.

文章评论(Comment)：