摘要
以TiNi和NiCrMo为双过渡层焊接材料,对TA1/X80复合板进行了熔焊对接实验,利用OM、SEM、EDS及XRD等检测实验对接头组织构成、微观形貌、成分、相组成及力学性能进行了研究。结果表明,TA1/TiNi焊缝以等轴晶组织穿插连接,从TA1侧到TiNi侧,Ti元素在界面处急剧降低,Ni元素缓慢升高;TiNi/NiCrMo焊缝以树枝状组织相互延伸并交织在一起,在界面处形成了宽约40μm的过渡带;从过渡带TiNi侧到NiCrMo侧,Ti元素急剧降低,Ni元素先降低后又升高,Cr、Mo元素逐渐升高;NiCrMo/X80焊缝以点状或针状组织相互渗透连接,从NiCrMo侧到X80侧,Fe元素急剧升高,Ni、Cr急剧降低。TiNi焊缝与NiCrMo焊缝均生成了一定数量的脆性相,并导致接头强度、塑韧性低于母材区。
Fusion weld of TAI/X80 composite plate was carried out by taking foils of TiNi, and NiCrMo as the double transition layer weld material. Then the microstructure, morphology, chemical and phase composition and mechanical properties of the weld metal were characterized by means of metal- Iography, SEM, EDS, XRD. Results revealed that the weld seam with TA1/TiNi weld metal exhibited a microstructure with equiaxed grains, and the Ti content drastically descended along a line from TA1 side to TiNi side while Ni content gradual increases. The weld seam with TiNi/NiCrMo exhibited a dendritic microstructure and there existed a 40 μm wide transitional zone, and the Ti content rapidly reduced along a line from TiNi side to NiCrMo side, while Ni content decreased first and then restored, but Cr and Mo increased gradually. The weld seam of NiCrMo/X80 showed a mixed grain- and acicular-like microstruc- ture, and the Fe content increased sharply at the interface, while the Ni content and Cr content reduced dramatically along a line from the NiCrMo side to the X80 side. The strength and toughness of welded joint are lower than that of the base metal area due to that there existed a certain number of brittle phases in the weld seams with TiNi and NiCrMo.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2016年第5期372-378,共7页
Chinese Journal of Materials Research
基金
国家高技术研究发展计划项目2013AA031303
国家自然科学基金51274162
西安航空学院校级科研基金2015KY1104资助~~
关键词
金属材料
TA1/X80复合板
组织性能
熔焊对接
接头
元素分布
metallic materials, TA1/X80 composite plate, microstructure and properties, fusion weld butt joints, butt joint, distribution of element
