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Research Papers

A New Crack Healing Kinetic Model and Application of Crack Healing Diagram

[+] Author and Article Information
Y. Kan

School of Materials Science and Engineering,
Dalian University of Technology,
Dalian 116024, China
Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China
e-mail: ykan@imr.ac.cn

H. Liu

e-mail: hliu@imr.ac.cn

S. H. Zhang

e-mail: shzhang@imr.ac.cn
Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China

L. W. Zhang

School of Materials Science and Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mail: zhanglw@dlut.edu.cn

M. Cheng

Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China
e-mail: mcheng@imr.ac.cn

1Present address: 72 Wenhua Road, Shenyang, China.

2Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the Journal of Manufacturing Science and Engineering. Manuscript received August 8, 2012; final manuscript received June 3, 2013; published online September 11, 2013. Assoc. Editor: Brad L. Kinsey.

J. Manuf. Sci. Eng 135(5), 051003 (Sep 11, 2013) (5 pages) Paper No: MANU-12-1241; doi: 10.1115/1.4024764 History: Received August 08, 2012; Revised June 03, 2013

An internal crack is a common defect which can lead to failure of the material. There are few published studies which can quantitatively predict healed fractions under given conditions such as temperature, pressure and healing time. In the current study, a new crack healing kinetic model is developed to predict the healed crack fraction under any given temperature, pressure and healing time. In contrast to previous models, this new model describes the crack surface topography as a series of semi spherical pores, and proposes a new diffusion healing mechanism involving grain growth. Plastic deformation, power law creep and diffusion controlled creep mechanism are considered in this model. A crack healing diagram for 34MnV steel is constructed with axes of healed fraction and temperature or pressure. The predictions from the new model compare well with experimental results. The results of the model indicate that the diffusion controlled creep mechanism contributes little at high temperatures because of grain growth. The critical healing time and pressure can be determined by using the crack healing diagram.

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Figures

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Fig. 1

Modeled crack surface

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Fig. 2

Representative spherical pore: (a) initial geometry and (b) finial geometry

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Fig. 3

The comparison between experimental and calculated grain sizes

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Fig. 4

Predictions of the model for 34MnV steel compared to experimental results

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Fig. 5

Total calculated healed crack fraction using grain growth model and constant grain size model

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Fig. 6

Comparison of healed fraction curves only by diffusion healing mechanism using constant grain size and grain growth model

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Fig. 7

Healed crack fraction and temperature diagram for 34MnV steel

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Fig. 8

Healed crack fraction and pressure diagram for 34MnV steel

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