CAJ | 학술논문

为了研究工业纯锆在焊缝不同区域的分布、金相组织和力学性能之间的关系，采用TIG方法焊接锆R60702工业纯锆板对接焊缝，采用光学显微镜、电子探针和显微硬度计等仪器，分析焊缝母材区、热影响区、熔合区和焊缝区的金相组织、机械性能和元素分布特性。研究结果表明：对接接头各区域的组织不同，母材区的晶粒为等轴状，呈面织构；不完全重结晶区的晶粒亦为等轴状，而且更细于母材晶粒，因而强度、塑性优良；过热区的晶粒则较粗大；焊缝区组织为铸态晶粒，形状为纤维状；对接接头各区的元素分布较为均匀，没有明显的偏析现象；焊接接头的硬度呈W型分布，最高硬度分布在焊缝区达到290 HV50 g ，最低硬度分布在不完全重结晶区，达到162 HV50 g ，过热区则介于母材区与焊缝区之间。
위료연구공업순고재한봉불동구역적분포、금상조직화역학성능지간적관계，채용TIG방법한접고R60702공업순고판대접한봉，채용광학현미경、전자탐침화현미경도계등의기，분석한봉모재구、열영향구、용합구화한봉구적금상조직、궤계성능화원소분포특성。연구결과표명：대접접두각구역적조직불동，모재구적정립위등축상，정면직구；불완전중결정구적정립역위등축상，이차경세우모재정립，인이강도、소성우량；과열구적정립칙교조대；한봉구조직위주태정립，형상위섬유상；대접접두각구적원소분포교위균균，몰유명현적편석현상；한접접두적경도정W형분포，최고경도분포재한봉구체도290 HV50 g ，최저경도분포재불완전중결정구，체도162 HV50 g ，과열구칙개우모재구여한봉구지간。
The element distribution,metallurgical structure and mechanical properties in different parts as base-zone,heat-treatment zone,and welded seam in butt-jointed seam of industrial pure zirconium R60702 welded with TIG was analyzed using optical microscope,electron probe and micro-hardness tester to study the relationship of microstructure and mechanical properties. The results show that different zones of the butt-jointed seam have different metallurgical structures:the crystalline grains in the base metal are equiaxed and surface textured;smaller and equiaxed grains in incomplete recrystallization zone create better mechanical properties in strength and plasticity;coarse grains are found in over-heated zone;and the casting organization with fibre structure is obtained in welded seam zone. The elements distribute uniformly in the butt-welded seam without obvious segregation. The hardness distribution in the butt-jointed seam between the base metal to the welded seam zone is depicted as W-shape:the maximum micro-hardness reaches 290 HV50 g at the position of welded seam, the minimum harness is located in the overheated zone with a value of 162 HV50 g ,and the hardness of over-heated zone fall in between.