Influences of Mo on stress corrosion cracking susceptibility of newly developed FeCrMnNiNC-based lean austenitic stainless steels

• Published in: Materials characterization Vol. 119; pp. 200 - 208
• Main Authors: Ha, Heon-Young, Seo, Won-Gyu, Park, Jun Young, Lee, Tae-Ho, Kim, Sangshik
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.09.2016
• Subjects: Alloys; Austenitic stainless steels; Corrosion resistance; Economics; Heat resistant steels; Lean duplex stainless steel; Mechanical properties; Molybdenum; Pitting corrosion; Slow strain rate; Stress corrosion cracking; Pitting corrosion; Stress corrosion cracking; Molybdenum; Lean duplex stainless steel
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2016.08.006

In this paper, newly developed high interstitial alloys, Febalance18Cr10Mn1Ni0.4N0.15CxMo (x=0, 0.91, and 1.76wt%), were briefly introduced, and susceptibility to stress corrosion cracking of the alloys was discussed based on slow strain rate test results and fractographic observation. It was found that the economical developed alloys exhibited superior mechanical properties and resistance to pitting corrosion to those of AISI 316L stainless steel. In addition, it was revealed that the addition of Mo ranging from 0 to 1.76wt% affected tensile properties only in a limited manner, but it increased the resistance to the stress corrosion cracking of the alloys. The improved resistance to stress corrosion cracking was attributed to the enhanced pitting corrosion resistance and suppressed intergranular decohesion of the matrix by addition of Mo. •Newly developed Fe18Cr10Mn1Ni0.4N0.15C(0.91, 1.76wt%)Mo alloys were introduced.•The developed alloys showed superior tensile properties to AISI 316L alloy.•The developed alloys showed superior pitting corrosion resistance to AISI 316L alloy.•Addition of Mo increased resistance to the stress corrosion cracking of the alloys.•Alloyed Mo increased pitting corrosion resistance and grain boundary cohesion.