16MnR钢在不同条件下的疲劳裂纹扩展规律

金属学报

2009, Vol. 45

Issue (7): 849-855

论文

本期目录 | 过刊浏览

16MnR钢在不同条件下的疲劳裂纹扩展规律

熊缨^1;2; 陈冰冰^1;2; 郑三龙^1;2; 高增梁^1;2

1) 浙江工业大学机械工程学院; 杭州 310032
2) 浙江工业大学教育部机械制造与自动化重点实验室; 杭州 310032

STUDY ON FATIGUE CRACK GROWTH BEHAVIOR OF 16MnR STEEL UNDER DIFFERENT CONDITIONS

XIONG Ying^1;2; CHEN Bingbing^1;2; ZHENG Sanlong^1;2; GAO Zengliang^1;2

1) College of Mechanical Engineering; Zhejiang University of Technology;
Hangzhou 310032
2) The Ministry of Education Key Laboratory of Mechanical Manufacture and
Automation; Zhejiang University of Technology; Hangzhou 310032

引用本文:

熊缨陈冰冰郑三龙高增梁. 16MnR钢在不同条件下的疲劳裂纹扩展规律[J]. 金属学报, 2009, 45(7): 849-855.
, , , . STUDY ON FATIGUE CRACK GROWTH BEHAVIOR OF 16MnR STEEL UNDER DIFFERENT CONDITIONS[J]. Acta Metall Sin, 2009, 45(7): 849-855.

全文: PDF(1191 KB)

摘要:

采用压力容器用16MnR热轧钢不同缺口尺寸、不同厚度的紧凑拉伸 (CT)试样, 进行了不同温度、不同应力比条件的一系列疲劳裂纹扩展实验, 得到了相应实验条件下的疲劳裂纹扩展速率. 讨论了高温环境、缺口半径、应力比及试样厚度对疲劳裂纹扩展行为的影响规律. 结果表明: 16MnR钢在环境温度为150和300 ℃时的疲劳裂纹扩展速率比25和425 ℃时低, 300℃时疲劳裂纹扩展速率最低, 300℃以上时随温度的升高裂纹扩展速率增大; 缺口半径的大小对初期疲劳裂纹扩展有较大的影响; 应力比对16MnR钢的疲劳裂纹扩展行为没有影响; 疲劳裂纹扩展速率随试样厚度的增大而增大.

关键词 ： 16MnR钢, 疲劳裂纹扩展速率, 高温, 缺口尺寸, 应力比, 试样厚度

Abstract：

16MnR steel is a most widely used material for pressure vessels. The study on fatigue is very important for safety and fatigue life assessment of pressure vessels. Several experimental researches for fatigue of 16MnR steel were conducted and test data have been gotten, but it was short of fatigue study of the material under various conditions at present. The fatigue crack growth tests of 16MnR hot--rolling steel were carried out at different< temperatures and R--ratios with compact tension (CT) specimens in this paper. Different sized circular notches at the tip of the slot ranging from very sharp< to blunt were used in the CT specimens and the radii of the notches were 0.1, 1 and 2 mm, and the thicknesses of CT specimens were 3.8, 12.5, 18 and 25 mm, respectively. The fatigue crack growth performances were obtained. The effects of temperatures, notch sizes, R--ratios and specimen thickness on fatigue crack growth behaviors were studied. It was shown that the fatigue crack growth rates at 150 and 300 ℃ were lower than those at 25 and 425 ℃, the lowest one was at 300 ℃ and the crack growth rate increased with temperature above 300 ℃. The great influence of notch sizes on the fatigue crack growth rate was observed at early stage of crack growth only. The results also indicated that fatigue crack growth rate increased as the specimen thickness increased, but the fatigue crack growth rate of 16MnR steel was insensitive to the R--ratios.

Key words： 16MnR steel fatigue crack growth rate high temperature notch sizes R-ratio specimen thickness

收稿日期: 2008-10-21

ZTFLH:

TF777.1

基金资助:

国家高技术研究发展计划项目2007AA04Z430, 教育部留学回国人员科研启动基金项目和浙江省自然科学基金项目Y107284资助

作者简介: 熊缨, 女, 1969年生, 副教授, 博士

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