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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.1
- 수록면
- 726 - 735 (10page)
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초록· 키워드
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In this study, the surface and cross section of an as-received API X70 pipeline steel was studied by SEM and EDStechniques in order to categorize the shape and morphology of inclusions. Then, an electrochemical hydrogencharging using a mixed solution of 0.2 M sulfuric acid and 3 g/l ammonium thiocyanate has been utilized to createhydrogen cracks in X70 steel. After hydrogen charging experiments, the cross section of this steel has been accuratelychecked by SEM in order to find out hydrogen cracks. The region of hydrogen cracks was investigated bySEM and EBSD techniques to predict the role of different microstructural parameters involving hydrogen inducedcracking (HIC) phenomenon. The results showed that inclusions were randomly distributed in the cross section oftested specimens. Moreover, different types of inclusions in as-received X70 steel were found. However, onlyinclusions which were hard, brittle and incoherent with the metal matrix, such as manganese sulfide and carbonitrideprecipitates, were recognized to be harmful to HIC phenomenon. Moreover, HIC cracks propagate dominantlyin transgraular manner through differently oriented grains with no clear preferential trend. Moreover, adifferent type of HIC crack with about 15-20 degrees of deviation from the rolling direction was found and studiedby EBSD technique and role of micro-texture parameters on HIC was discussed.
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