Y.S.Wu
,
D.Y. Liu
,
B. Cao
,
F. L. Wang
,
X.Y. Wang
,
Z.Fang and Z.G.Du (Department of Surface Science and Corrosion Engineering
,
University of Science and Technology Beijing
,
Beijing 100083
,
China)
金属学报(英文版)
The electrochemical behaviour, including free corrosion potential, free corrosion current density and polarization curve, of various thermal history zones on the weldment was measured in this paper. The weldment consisted of matrix, tempering zone. incomplete normalized zone, normalized zone, overtemperature zone, fusion line zone and weld metal zone. The electrochemical behaviour of the ferrite, pearlite and mixed structure in various zones have successfully measured. The results showed that there was a difference of free corrosion potential which is smaller than ca. 200mV between various zones and about 20-150mV potential difference between ferrite and pearlite in every zone. The free cormsion potential of fusion line zone was the most negative between various zones. The free corrosion potential of pearlite was some dozens mV more negative than ferrite. The corrosion course of various zones and of different phase structures on the weldment and their effect on corrosion attack of weldment were discussed.
关键词:
weldment
,
null
,
null
,
null
罗键
,
马杰
,
王向杰
,
孙玉
,
马丽翠
稀有金属材料与工程
以AZ31B镁合金为研究对象,采用TIG焊接方法,研究了外加纵向磁场对镁合金焊缝成形、焊缝组织及其焊接裂纹的影响规律.研究表明:在外加脉冲交变纵向磁场作用下,镁合金焊缝的熔宽增大,熔深减小,焊缝晶粒细化,析出相增加并呈弥散化分布状况;外加磁场影响了镁合金的焊缝成形和显微硬度,能够控制镁合金焊缝组织、减少镁合金焊缝热裂纹的产生,改善镁合金焊缝的性能.
关键词:
镁合金
,
纵向磁场
,
TIG焊
,
焊缝
