CAJ | 학술논문

对X90和X100管线钢管进行了夏比冲击试验，发现焊缝HAZ韧性有所降低，通过金相组织观察，发现热影响区出现不同程度的板条马氏体组织，经过硬度试验，认为脆硬的板条马氏体的出现降低了焊缝HAZ的韧性指标，是夏比冲击性能不合格的主要原因。将试样在不同温度下进行回火热处理后焊缝HAZ的韧性性能均有明显提高，说明通过热处理能有效地降低甚至消除淬硬组织对焊缝热影响区冲击韧性的影响。
대X90화X100관선강관진행료하비충격시험，발현한봉HAZ인성유소강저，통과금상조직관찰，발현열영향구출현불동정도적판조마씨체조직，경과경도시험，인위취경적판조마씨체적출현강저료한봉HAZ적인성지표，시하비충격성능불합격적주요원인。장시양재불동온도하진행회화열처리후한봉HAZ적인성성능균유명현제고，설명통과열처리능유효지강저심지소제쉬경조직대한봉열영향구충격인성적영향。
The Charpy impact test was conducted on X90 and X100 line pipe respectively, it found the toughness of weld HAZ reduces. Through observing metallographic structure, it found lath martensite structure appeared in HAZ in different degree. Through hardness test, it regarded that the presence of the rigid lath martensite decreases weld HAZ toughness index, it is the major reason caused unqualified Charpy impact toughness. The weld HAZ impact toughness of sample were improved evidently after tempering heat treatment under different temperature, it indicated heat treatment can effectively reduce and eliminate the influence of quenched hard structure to weld HAZ impact toughness.