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

Acta Metall Sin

2009, Vol. 45

Issue (7): 849-855 DOI:

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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

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XIONG Ying CHEN Bingbing ZHENG Sanlong GAO Zengliang. STUDY ON FATIGUE CRACK GROWTH BEHAVIOR OF 16MnR STEEL UNDER DIFFERENT CONDITIONS. Acta Metall Sin, 2009, 45(7): 849-855.

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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

Received: 21 October 2008

ZTFLH:

TF777.1

Fund:

Supported by National High Technology Research and Development Program of China (No.007AA04Z430), the Scientific Research Foundation for the Returned Overseas Chinese Scholars and Natural Science Foundation of Zhejiang Province (No.Y107284)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I7/849

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