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Vol.54, No.4, 295 ~ 304, 2016
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| Title |
| Effect of Plastic Deformation on Hydrogen Induced Crack Resistance of API X65 Linepipe Steel |
| 성준호 Joon Ho Sung , 김윤규 Yun Kyu Kim , 문종걸 Jong Geol Moon , 김기원 Ki Won Kim , 강기봉 Ki Bong Kang , 조경목 Kyung Mox Cho |
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| Abstract |
| The resistance of hydrogen induced cracking (HIC) in two different microstructures of API X65MS steel plates was investigated with plastic deformation. A banded type of polygonal ferrite/acicular ferrite (PF/AF) microstructure and a single phase acicular ferrite (AF) were produced by controlling the rolling and cooling conditions. As plastic deformation increased, dislocation density was increased, particularly in the banded AF within the two phase PF/AF microstructure. In contrast, the dislocation density was increased uniformly in the single phase AF microstructure. It was found that HIC resistance deteriorated with increasing plastic deformation. Between the two different types of microstructures, the uniform AF showed better HIC resistance and higher crack propagation resistance than PF/AF, which can be attributed to the more uniform distribution of dislocation density in the AF microstructure. |
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| Key Words |
| linepipe steel, plastic deformation, microstructure, hydrogen induced cracking , HIC, dislocation density |
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