Stress Corrosion Cracking Behavior of Austenitic （奥氏体的应力腐蚀开裂行为）.pdfVIP

Journal of Metals, Materials and Minerals, Vol.20 No.3 pp.25-29, 2010 Stress Corrosion Cracking Behavior of Austenitic Stainless Steel AISI 304 with Cold Work Severities of 60 and 90 Percent Reduction in Thickness Kitikhun SUTTHIPRAPA, Nathapon JUMAO, Weerawat SRICHANCHAENG, Jirawat CHATDUMRONGSAKUL and Pornwasa WONGPANYA* School of Metallurgical Engineering, Suranaree University of Technology Nakhon Ratchasima, 30000, Thailand Abstract The effect of cold work intensity on the stress corrosion cracking (SCC) behavior of AISI 304 austenitic stainless steel was studied in accordance with the ASTM G36-94. The samples were unidirectional cold-rolled up to 60 and 90 percent reduction in thickness, prepared to be U-bend specimens and tested in boiling 42 wt% magnesium chloride solution at 155±1°C. The result indicated that the cold work intensity significantly impacted on the cracking appearance. The result indicated that the cold work intensity significantly impacted on cracking appearance. By considering the microstructure from scanning electron microscope (SEM) after SCC testing, transgranular cracking appeared in the sample with 60 percent reduction in thickness while the sample with 90 percent reduction in thickness showed intergranular cracking. The corrosion severity associated with stress significantly depends on the percent reduction in thickness. Corrosion rate in terms of millimeter per year increased with the level of cold work intensity. Key words: Austenitic stainless steel, Cold work, Stress corrosion cracking, Magnesium chloride solution Introduction