CAJ | 학술논문

研究Al-Mg-Mn-Sc-Zr合金的焊接工艺和焊接接头组织和性能.采用搅拌摩擦焊(FSW)和氩弧焊(TIG)2种焊接工艺对该合金的热轧和冷轧-退火2种使用态板材进行焊接.采用比较研究的方法测定和研究焊接接头的力学性能和显微组织,利用光学显微镜和透射电子显微镜研究焊缝的显微组织和力学性能之间的关系.结果表明,与基材相比,Al-Mg-Mn-Sc-Zr合金的热轧和冷轧-退火板材的FSW和TIG焊接接头的强度均下降,但FSW焊接系数高于TIG焊接系数.这是因为FSW焊接接头焊核区亚结构强化的丧失和Al3(Sc,Zr)的析出强化作用的极少量丧失,而TIG焊焊接接头的软化主要原因是其形变强化的完全丧失和Al3(Sc,Zr)的析出强化作用的大部分丧失,且搅拌摩擦焊焊核区晶粒比TIG焊的焊缝区晶粒更细小.
연구Al-Mg-Mn-Sc-Zr합금적한접공예화한접접두조직화성능.채용교반마찰한(FSW)화아호한(TIG)2충한접공예대해합금적열알화랭알-퇴화2충사용태판재진행한접.채용비교연구적방법측정화연구한접접두적역학성능화현미조직,이용광학현미경화투사전자현미경연구한봉적현미조직화역학성능지간적관계.결과표명,여기재상비,Al-Mg-Mn-Sc-Zr합금적열알화랭알-퇴화판재적FSW화TIG한접접두적강도균하강,단FSW한접계수고우TIG한접계수.저시인위FSW한접접두한핵구아결구강화적상실화Al3(Sc,Zr)적석출강화작용적겁소량상실,이TIG한한접접두적연화주요원인시기형변강화적완전상실화Al3(Sc,Zr)적석출강화작용적대부분상실,차교반마찰한한핵구정립비TIG한적한봉구정립경세소.
In order to study the welding process,microstructure and properties of Al-Mg-Mn-Sc-Zr alloy,comparative methods of friction stir welding (FSW) and tungsten inert gas (TIG) were applied to the two conditions of this alloy,namely hot rolled plate and cold rolled-annealed plate.The relationships between microstructures and properties of the welded joints were investigated by means of optical microscopy and transmission electron microscopy.Compared with the base metal,the strength of FSW and TIG welded joints decreased,and the FSW welding coefficients were higher than the TIG welding coefficients.The loss of substructure strengthening and a very little loss of precipitation strengthening of Al3(Sc,Zr) cause the decreased strength of FSW welded joint.But for the TIG welded joint,the disappearance of both the strain hardening and most precipitation strengthening effect ofAl3(Sc,Zr)particles contributed to its softening.At the same time,the grains in weld nugget zone of FSW welded joints were finer than those in the molten zone of TIG welded joints.