| Internal crack recovery of 20MnMo steel |
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| 作者姓名： | 韩静涛 赵钢 曹起骧 |
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| 作者单位： | Department of Metalforming，University of Science and Technology Beijing，Beijing 100083，The 1202 Factory of PLA，Beijing 100081，China，Department of Mechanical Engineering，Tsinghua University，Beijing 100084，China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China. |
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| 摘 要： | According to the results of physical modelling, SEM and SAM analysis of 20MnMo steel samples, internal cracks of metal parts are recoverable. The motive power of the recovery is atom diffusion and migration from matrix to voids. The recovery process consists of two steps. In the first step, the void area is filled up with a kind of metal mass, beginning from the crack tip. There are many microvoids in the mass with different microstructure from the matrix. In the second step, microvoids decrease in size and number, and the mass microstructure approaches the matrix, with the heating temperature increasing and the holding time prolonging. Recovery tests on rejected heavy forgings are successfully processed. It is believed that the recovery technique is a potential method for improving the internal quality and reducing the production loss and cost of metal products. Similar method can be used to treat other metal construction parts for rescuing them or prolonging their service life. Further research and de
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Internal crack recovery of 20MnMo steel |
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| Jingtao Han,Gang Zhao,Qixiang Cao.Internal crack recovery of 20MnMo steel[J].Science in China(Technological Sciences),1997,40(2):164-169. |
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| Authors: | Jingtao Han Gang Zhao Qixiang Cao |
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| Affiliation: | (1) Department of Metalforming, University of Science and Technology Beijing, 100083 Beijing, China;(2) The 1202 Factory of PLA, 100081 Beijing, China;(3) Department of Mechanical Engineering, Tsinghua University, 100084 Beijing, China |
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| Abstract: | According to the results of physical modelling, SEM and SAM analysis of 20MnMo steel samples, internal cracks of metal parts are recoverable. The motive power of the recovery is atom diffusion and migration from matrix to voids. The recovery process consists of two steps. In the first step, the void area is filled up with a kind of metal mass, beginning from the crack tip. There are many microvoids in the mass with different microstructure from the matrix. In the second step, microvoids decrease in size and number, and the mass microstructure approaches the matrix, with the heating temperature increasing and the holding time prolonging. Recovery tests on rejected heavy forgings are successfully processed. It is believed that the recovery technique is a potential method for improving the internal quality and reducing the production loss and cost of metal products. Similar method can be used to treat other metal construction parts for rescuing them or prolonging their service life. Further research and development of recovery technique have very important theoretical and practical significance. |
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| Keywords: | internal crack crack recovery forging SEM SAM |
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