CAJ | 학술논문

研究了不同温度焊后时效处理对2219铝合金变极性钨极氩弧焊（VPTIG）接头各微区显微组织的影响，采用显微硬度测试和透射电镜观察分析焊接接头各微区析出相的形貌和分布。结果表明，焊后时效处理温度不同，焊接接头各微区显微组织和硬度发生的变化不同。热影响区中的完全回复区对焊后时效最为敏感，低温处理时显微硬度就有明显增长，并在160℃处理时达到最大涨幅；焊缝区变化相对较小，其显微硬度的最高涨幅出现在210℃，且小于前者；热影响区中的过时效区最为稳定，显微硬度的最大增长同样出现在160℃，但涨幅很小。透射电镜观察表明，焊接接头各微区的显微硬度变化主要与时效强化相的析出行为有关。
연구료불동온도한후시효처리대2219려합금변겁성오겁아호한（VPTIG）접두각미구현미조직적영향，채용현미경도측시화투사전경관찰분석한접접두각미구석출상적형모화분포。결과표명，한후시효처리온도불동，한접접두각미구현미조직화경도발생적변화불동。열영향구중적완전회복구대한후시효최위민감，저온처리시현미경도취유명현증장，병재160℃처리시체도최대창폭；한봉구변화상대교소，기현미경도적최고창폭출현재210℃，차소우전자；열영향구중적과시효구최위은정，현미경도적최대증장동양출현재160℃，단창폭흔소。투사전경관찰표명，한접접두각미구적현미경도변화주요여시효강화상적석출행위유관。
The effects of post-weld aging treatment on microstructure and micro-hardness of aluminum alloy grade 2219 welds are pres-ented.The microstructure including the precipitates distribution and morphology was observed by transmission electron microscopy (TEM)and micro-hardness was measured to characterize the different micro-areas across the weld.The results show that different post-weld aging temperatures lead to variations in microstructure and micro-hardness across the weld.Full reversion area (RA)in the heat affected zone (HAZ)is the most sensitive to the aging process.Micro-hardness in this area shows obvious improvement when it is pro-cessed at low aging temperatures,and the maximum increase is achieved at 160℃.The micro-hardness in the weld metal (WM)re-mains relatively stable.The maximum increase is achieved at 210℃.The over-aged area (OA)shows a very limited increase in micro-hardness and the maximum value is obtained at 160℃.TEM observation revealed that the changes in micro-hardness of micro-areas across the weld are mainly related with the precipitate evolution during the aging process.