원문정보
초록
영어
The microstructure and mechanical properties of the heat-affected zone welded using the GTAW process on SDSS material used in offshore structures were analyzed. The chemical composition of the specimen material was analyzed using XRF. The microstructure of the heat-affected zone where the plate was welded was examined by SEM, and the ferrite volume fraction was assessed using the point count method of ASTM E562. A lot of ferrite was formed in the overheated weldment region, and In the weld cap where the cooling rate was fast, ferrite was not converted back to austenite and the microstructure was not uniform. From the ferrite phase fraction, it was shown that it can be applied to the pitting resistance equivalent numbers through changes in mechanical properties according to welding conditions.
목차
1. Introduction
2. Experimental Methods
2.1 Chemical composition of base metals
2.2 Pre-treatment of the specimens before GTAW
2.3 Gas tungsten arc welding of the specimens
2.4 Microstructure analysis using scanning electron microscope
2.5 Ferrite volume fraction and hardness analysis in the weld zone
3. Results and Discussion
3.1 Microstructural analysis and critical pitting temperature of the weld zone
3.2 Ferrite volume fraction and hardness analysis of the weld region
4. Conclusions
Acknowledgments
References