紧凑拉伸试样厚度对25Cr2NiMo1V钢高温蠕变裂纹扩展速率的影响

谈建平; 王国珍; 轩福贞; 涂善东

紧凑拉伸试样厚度对25Cr2NiMo1V钢高温蠕变裂纹扩展速率的影响

华东理工大学机械与动力工程学院, 承压系统安全科学教育部重点实验室, 上海 200237

基金项目:

国家自然科学基金资助项目(50835003, 51075149)

国家高技术研究发展(“863”)计划课题项目(2009AA04Z409, 2009AA04Z421)

详细信息

作者简介:
谈建平(1986-), 男, 上海人, 博士研究生。

中图分类号: TG142.73
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出版历程
- 收稿日期: 2011-11-30
- 刊出日期: 2012-10-19

The Effect of CT Specimen Thickness on High Temperature Creep Crack Growth Rate of 25Cr2NiMo1V Steel

摘要

摘要: 研究了紧凑拉伸(CT)试样厚度对25Cr2NiMo1V钢在566 ℃时, 蠕变裂纹扩展(CCG)速率的影响规律及其机理。结果表明: 试样厚度对CCG速率的影响与载荷水平(C*)相关; 在低载荷水平区, 随试样厚度的增加, 面外拘束水平增大, 试样趋向于以沿晶蠕变脆性方式断裂, CCG速率增大; 在高载荷水平区, 不同厚度的试样均以沿晶和穿晶的混合方式发生蠕变延性断裂, CCG速率基本不受试样厚度的影响; CCG速率与载荷水平在双对数坐标中并非呈单一的线性关系, 而是由不同斜率的两段直线构成, 低载荷水平区的直线斜率低于高载荷水平区的, 如果用高载荷水平区的CCG速率数据外推得到低载荷水平区的CCG速率, 将得到非保守的结果。
- 蠕变裂纹扩展 /
- 试样厚度 /
- 蠕变断裂机理 /
- 载荷水平 /
- 拘束效应
Abstract: The effect of thickness of compact tension (CT) specimens on creep crack growth (CCG) rate and its mechanism for Cr-Mo-V steel at 566 ℃ was investigated. The results show that the effect of specimen thickness on CCG rate is related to load level (C*). At the lower load level region, with increasing the specimen thickness, the out-of-plane constraint increased and the specimens tended to fracture in intergranular creep brittle fracture mode, and the CCG rate increased. At the higher load level region, all specimens fractured in mixed intergranular and transgranular creep ductile fracture mode, and the CCG rates basically were not affected by the specimen thickness. The CCG rate versus load level curves on log-log scale were composed of two straight lines with different slopes instead of a single linear relation. Because the straight line slope at lower load level region was smaller than that at higher load level region, it would be non-conservative if the CCG rate at lower load level was extrapolated from that at higher load level.
- creep crack growth /
- specimen thickness /
- creep fracture mechanism /
- load level /
- constraint effect

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参考文献(13)

[1]	BUDDEN P J,DEAN D W . Constraint effects on creep crack growth[C]//Eighth international conference on creep and fatigue at elevated temperatures: Creep2007. San Antonio,Texas,USA:American Society of Mechanical Engineers,2007.
[2]	OZMAT B, ARGON A S, PARKS D M. Growth modes of cracks in creeping Type 304 stainless steel[J].Mechanics of Materials,1991,11:1-17.
[3]	TABUCHI M,KUBO K,YAGI K. Effect of specimen size on creep crack growth rate using ultra-large CT specimens for 1Cr-Mo-V steel[J].Engineering Fracture Mechanics,1991,40:311-321.
[4]	BETTINSON A D. The influence of constraint on the creep crack growth of 316H stainless steel[D].London:Imperial College London,2002.
[5]	BETTINSON A D, O'DOWD N P, NIKBIN K M, et al. Experimental investigation of constraint effects on creep crack growth[C]//2002 ASME pressure vessels and piping conference. Vancouver, BC, Canada: American Society of Mechanical Engineers,2002.
[6]	TABUCHI M, ADACHI T, YOKOBORI JR A T, et al. Evaluation of creep crack growth properties using circular notched specimens[J].International Journal of Pressure Vessels and Piping,2003,80:417-425.
[7]	YATOMI M, NIKBIN K M, O’DOWD N P. Creep crack growth prediction using a damage based approach[J].International Journal of Pressure Vessels and Piping,2003,80:573-583.
[8]	TAKAHASHI Y, IGARI T, KAWASHIMA F, et al. High temperature crack growth behavior of high-chromium steels [C]//18th International Conference on Structural Mechanics in Reactor Technology. Beijing, China:[s.l.],2005: 1904-1915.
[9]	LAIARINANDRASANA L, KABIRI M R, REYTIER M. Effect of specimen geometries on the C* versus da/dt master curve for type 316L stainless steel[J].Engineering Fracture Mechanics,2006,73:726-737.
[10]	DOGAN B, CEYHAN U, NIKBIN K M, et al. European code of practice for creep crack initiation and growth testing of industrial specimens[J].Journal of ASTM International,2006,3(2):87-89.
[11]	ASTM E 1457-00 Standard test method for measurement of creep crack growth rates in metals[S].American Society for Testing and Materials,2000.
[12]	WANG G Z, LIU X L, XUAN F Z, et al. Effect of constraint induced by crack depth on creep crack-tip stress field in CT specimens[J].International Journal of Solids and Structures,2010,47:51-57.
[13]	SUN P J, WANG G Z, XUAN F Z, et al. Quantitative characterization of creep constraint induced by crack depths in compact tension specimens[J].Engineering Fracture Mechanics,2011,78:653-665.

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紧凑拉伸试样厚度对25Cr2NiMo1V钢高温蠕变裂纹扩展速率的影响

作者简介: 谈建平(1986-), 男, 上海人, 博士研究生。

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出版历程

The Effect of CT Specimen Thickness on High Temperature Creep Crack Growth Rate of 25Cr2NiMo1V Steel

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出版历程

目录

作者简介:
谈建平(1986-), 男, 上海人, 博士研究生。