Hot Ductility Behaviors in the Weld Heat-Affected Zone of Nitrogen-Alloyed Fe-18Cr-10Mn Austenitic Stainless Steels
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tly, high-nitrogen austenitic stainless steels (HNS) have received much attention due to their excellent combination of mechanical properties and corrosion resistance for relatively low cost, by replacing nickel (Ni) in conventional austenitic stainless steels with nitrogen (N).[1–6] In addition, the reduction of Ni is profitable to prevent the environmental contamination. Extensive works have been performed to investigate the effect of N addition on mechanical properties of HNS.[1–3] Gavriljuk et al.[1] showed that N addition increased effectively the grain boundary strengthening in Fe-18Cr-16Ni-10Mn-N alloys. Irvine et al.[2] presented that N is the most effective element to increase 0.2 pct proof yield strength. Dai et al.[3] studied the high-cycle fatigue behavior of HNS and reported that the fatigue strength was enhanced by N addition, because they might increase stacking-fault energy (SFE) so as to decrease the inter-fatigue striation distance. The corrosion resistance is also an important characteristic to evaluate the performance of HNS.[4–6] Yoon et al.[4] suggested that N addition enhanced a stress corrosion cracking resistance of HNS by improving the resistance to pitting corrosion initiation and the repassivation kinetics. Ha et al.[5] reported that the pitting JOONOH MOON, Senior Researcher, and TAE-HO LEE, Principal Researcher, are with the Metallic Materials Division, Ferrous Alloy Department, Korea Institute of Materials Science, Changwon, Gyeongnam 642-831 Republic of Korea. Contact e-mail: mjo99@ kims.re.kr HYUN-UK HONG, Professor, is with the Department of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641-773 Republic of Korea. Manuscript submitted September 14, 2014. Article published online February 10, 2015 METALLURGICAL AND MATERIALS TRANSACTIONS A
corrosion resistance of HNS was improved by N addition due to the formation of more protective passive film. Kamachi Mudali et al.[6] also examined the effect of N on the pitting corrosion resistance of HNS and showed that an increase in N content from 0.015 to 0.56 pct increased the pitting corrosion resistance. Notwithstanding these excellent physical and electrochemical properties, the weldability of HNS should be also evaluated before applying to structural components because the formation of brittle zone in the weld heataffected zone (HAZ) usually deteriorated the quality of base materials.[7–9] Moon et al.[7,8] evaluated the pitting corrosion resistance in the HAZ of HNS and reported that the formation of d-ferrite in the HAZ deteriorated the pitting corrosion resistance. Woo et al.[9] showed that the excellent impact property of HNS decreased in the HAZ due to the formation of intergranular and cellular Cr2N precipitation. Meanwhile, it is estimated that the HNS may have high hot cracking susceptibility due to high amount of alloying elements such as Mn, Cr, and N. In general, hot ductility behavior is very important property to determine the hot cracking susceptibility in the HAZ; however, few studies on hot d
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