Thermally Stable Ni-rich Austenite Formed Utilizing Multistep Intercritical Heat Treatment in a Low-Carbon 10 Wt Pct Ni
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HIGH-PERFORMANCE structural materials are needed for U. S. Naval applications, such as ship hulls and decks, which require an excellent combination of strength, low-temperature impact toughness, ductility, blast resistance, and weldability.[1–4] In recent years, several research efforts have been performed, to develop alternatives to the widely used Naval HSLA-100 steels with a superior yield strength and blast resistance to reduce the weight of structural components and preempt increasing terrorist threats.[3,5–11] Optimizing the
DIVYA JAIN and GAUTAM GHOSH are with Northwestern University, Department of Materials Science & Engineering, 2220 Campus Drive, Evanston, IL 60208. Contact e-mail: divyajain2016@ u.northwestern.edu DIETER ISHEIM and DAVID N. SEIDMAN are with Northwestern University, Department of Materials Science & Engineering, and also with Northwestern University Center for AtomProbe Tomography (NUCAPT), 2220 Campus Drive, Evanston, IL 60208. XIAN J. ZHANG is with the Carderock Division, Naval Surface Warfare Center, West Bethesda, MD 20817. Manuscript submitted December 21, 2016. Article published online May 25, 2017 3642—VOLUME 48A, AUGUST 2017
overall mechanical properties for such applications entails several design challenges; most importantly, increasing the strength invariably leads to concomitant deterioration in toughness and ductility. The concept of transformation-induced-plasticity (TRIP) has been commonly utilized to combine high-strength in martensitic steels with good toughness[12–14] and to enhance ductility in automotive steels.[15–17] TRIP utilizes deformation-induced martensitic transformations to enhance plasticity of alloys.[18–20] The benefits of transformation toughening and enhanced ductility from such martensitic transformations rely on the volume fraction and relative stability of austenite, which can be tailored by optimizing the chemical compositions and heat treatments of steels. Low-carbon steels (
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