Effect of repeated TIG welding cycles on microstructure evolution and pitting corrosion behavior of UNS 32760 super duplex stainless steel

2nd Mineral Processing and Technology International Conference

工业技术（总论）;矿业工程

Alfian^1 ; Riastuti, R.^1 ; Winarto^1

Department of Metallurgy and Materials Engineering, Faculty of Engineering, University of Indonesia, Indonesia^1

关键词: Chromium nitride;    Corrosion behavior;    Gravimetric tests;    Metastable pits;    Micro-structure evolutions;    Super duplex stainless steel;    TIG-welding;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/478/1/012032/pdf
DOI  :  10.1088/1757-899X/478/1/012032

学科分类：工业工程学

来源: IOP

【 摘 要 】

Microstructure evolution and pitting corrosion behavior in repeated TIG welding cycles of UNS32760 super duplex stainless steel were studied. The microstructural evolution was observed through optical electron microscope. Meanwhile, pitting corrosion was investigated by means of potentiodynamic polarization and gravimetric test. The specimens were evaluated to simulate repeated welding cycles of original weld, Repair-1 (R1), Repair-2 (R2) and Repair-3 (R3) respectively. The result show that the chromium nitride precipitates starts appear in heat-affected zone R-2 welding cycles which followed by the growth of metastable pits.