CAJ | 학술논문

研究了X100和X80焊管焊缝的显微组织和冲击韧性，详细分析了焊缝韧性降低的原因。通过组织分析，得出显微组织不均匀即M/A组元和夹杂物聚集是降低焊缝韧性的重要因素。通过氧、氮、氢含量的测定和夹杂物分析，可知焊缝含氧量高导致焊缝中含有较多大尺寸非金属夹杂物，从而显著降低焊缝韧性。脆性M/A组元是导致焊缝韧性降低的另一个重要因素。控制焊缝韧性降低的主要措施为控制焊缝含氧量和脆性M/A组元含量。
연구료X100화X80한관한봉적현미조직화충격인성，상세분석료한봉인성강저적원인。통과조직분석，득출현미조직불균균즉M/A조원화협잡물취집시강저한봉인성적중요인소。통과양、담、경함량적측정화협잡물분석，가지한봉함양량고도치한봉중함유교다대척촌비금속협잡물，종이현저강저한봉인성。취성M/A조원시도치한봉인성강저적령일개중요인소。공제한봉인성강저적주요조시위공제한봉함양량화취성M/A조원함량。
In this paper, the weld microstructure and impact toughness of X100 and X80 welded pipe were studied, and the cause of weld toughness decrease was detailedly analyzed. Through structure analysis, it got that nonuniform microstructure, that is to say M/A constituents and inclusions aggregation are the key factors to lower weld toughness. Through the determination of the content of oxygen, nitrogen, hydrogen, and inclusion analysis, it showed high oxygen content lead to more big size of non-metallic inclusions in weld, thus significantly reduce the weld toughness. The brittle M/A constituents are the other important factor. Control the oxygen contents of weld and the content of brittle M/A constituents are the main measures for controlling weld toughness reduce.