CAJ | 학술논문

以氩气为保护气体,用同种合金的焊丝对一种2 mm厚的超轻镁锂合金板进行TIG焊接,研究焊接接头的显微组织和力学性能.结果表明,与母材相比,焊缝区晶粒细小,热影响区晶粒粗大.焊件的抗拉强度为母材的84%,断裂发生在热影响区,属于韧-脆混合性断裂.焊接后,焊缝区的Al和Ce在晶界处富集.
이아기위보호기체,용동충합금적한사대일충2 mm후적초경미리합금판진행TIG한접,연구한접접두적현미조직화역학성능.결과표명,여모재상비,한봉구정립세소,열영향구정립조대.한건적항랍강도위모재적84%,단렬발생재열영향구,속우인-취혼합성단렬.한접후,한봉구적Al화Ce재정계처부집.
Tungsten inert gas weld was carried out on super-light magnesium-lithium alloy plates with a thickness of 2 mm,using argon gas as a protecting atmosphere. The microstructure and mechanical properties of the welded joints were investigated. The results indicate that the microstructure in the fusion zone is fine,and the microstructure in the heat-affected zone is coarser than the parent metal. The tensile strength of the welded joint is about 84% that of the parent metal. The fracture occurs in a mixed type of toughness and brittleness in the heat-affected zone. During the welding process,aluminum and cerium are enriched at grain boundaries in the fusion zone.