闵娜,石楠楠,沈赟靓,吴晓春

• 1:上海大学微结构重点实验室
• 2:上海大学材料科学与工程学院

摘要(Abstract)：

采用内耗法研究了两种马氏体热作模具钢在高温服役过程中的弹性模量及内耗特征,结合JMA方程探讨了时效前期的动力学过程。结果表明:620℃热稳保温过程中4Cr2Mo2W2MnV钢的软化主要以马氏体基体回复为主,而3Cr2W8V钢基体中大量的W、C脱溶及合金碳化物的沉淀,导致材料力学性能明显下降。4Cr2Mo2W2MnV钢在620℃工作温度下的热稳定性比传统热作模具钢3Cr2W8V好,主要是由于基体中的较多的Mn和相对稳定细小的Mo、V系MC型碳化物对马氏体热作模具钢的热稳定性有贡献作用。

关键词(KeyWords)： 热稳定性;马氏体热作模具钢;内耗;弹性模量;JMA方程

Abstract:

Keywords:

基金项目(Foundation): 国家“十一五”科技支撑计划课题(2007BAE51B04);; 上海市重点学科建设项目资助(S30107)

作者(Author): 闵娜,石楠楠,沈赟靓,吴晓春

DOI: 10.13289/j.issn.1009-6264.2012.02.021

参考文献(References)：

• [1]Karagz S,Fischmeister H F,Andrén H O,et al.Microstructural changes during overtempering of high-speed steels[J].Metallurgica TransactionA,1992,23:1631-1640.
• [2]Stiller K,Svensson L E,Howell P R,et al.High resolution microanalytical study of precipitation in a powder metallurgical high speed steel[J].Acta Metallurgica,1984,32:1457-1467.
• [3]Medvedeva A,Bergstrom J,Gunnarsson S,et al.High temperature properties and microstructural stability of hot-work tool steels[J].MaterialsScience and Engineering A,2009,523:39-46.
• [4]Unterweiser P M,Boyer H E,Kubbs J J.Heat Treater’s Guide Standard Practices and Procedures for Steel[M].ASM,Metals Park,USA Ohio,44073,1982.
• [5]Nowick A S,Berry B S.Anelastic Relaxation in Crystalline Solids[M].New York:Academic Press,1972.
• [6]束德林.工程材料力学性能[M].北京:机械工业出版社,2004.
• [7]Christian J.Thoery of Transformation in Metals and Alloys[M].Oxford:Pergamon Press,1997:433-489.
• [8]Verner V D.Use of the internal friction method to study aging of interstitial solid solutions with FCC lattices[J].Metals Science and HeatTreatment,1969,11(6):438-442.
• [9]Lement B S,Cohen M.A dislocation-attraction model for the first stage of tempering[J].Acta Metallurgica,1956,4(5):469-476.
• [10]胡赓祥,蔡珣,等.材料科学基础[M].上海:上海交通大学出版社,2000.
• [11]闵娜,薛厂,佟倩,等.高锰系奥氏体热作模具钢时效过程中的内耗研究[J].上海交通大学学报,2011,44(5):621-623.Min Na,Xue Chang,Tong Qian,et al.Study on internal friction of ageing process of high Mn austenite hot work tool steel[J].Journal of ShanghaiJiaotong University,2011,44(5):621-623.
• [12]Duchateau D,Guttmann M.An X-ray microanalysis study of the partition of manganese in 6 and 9%Mn cryogenic steels and its influence on thestability of austenite dispersed in a tempered martensitic matrix[J].Acta Metallurgica,1987,29:1291-1297.
• [13]徐祖耀.相变原理[M].北京:科学出版社1988.

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