Deciphering the Possible Role of Strain Path on the Evolution of Microstructure, Texture, and Magnetic Properties in a F
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In the present work, the influence of strain path on the evolution of microstructure, crystallographic texture, and magnetic properties of a two-phase Fe-Cr-Ni alloy was investigated. The Fe-Cr-Ni alloy had nearly equal proportion of austenite and ferrite and was cold rolled up to a true strain of 1.6 (thickness reduction) using two different strain paths—unidirectional rolling and multi-step cross rolling. The microstructures were characterized by scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD), while crystallographic textures were determined using X-ray diffraction. For magnetic characterization, B-H loops and M-H curves were measured and magnetic force microscopy was performed. After unidirectional rolling, ferrite showed the presence of strong a-fiber (rolling direction, RD//h110i) and austenite showed strong brass type texture (consisting of Brass (Bs) ({110}h112i), Goss ({110}h001i), and S ({123}h634i)). After multi-step cross rolling, strong rotated cube ({100}h110i) was developed in ferrite, while austenite showed ND (normal direction) rotated brass (~ 10 deg) texture. The strain-induced martensite (SIM) was found to be higher in unidirectionally rolled samples than multi-step cross-rolled samples. The coherently diffracting domain size, micro-strain, coercivity, and core loss also showed a strong correlation with strain and strain path. More strain was partitioned into austenite than ferrite during deformation (unidirectional as well as cross rolling). Further, the strain partitioning (in both austenite and ferrite) was found to be higher in unidirectionally rolled samples. https://doi.org/10.1007/s11661-018-4714-0 The Minerals, Metals & Materials Society and ASM International 2018
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INTRODUCTION
FE-CR-NI alloys, having two-phase microstructure (austenite and ferrite) are increasing being used and are replacing austenitic stainless steels (ASSs) in many industrial applications due to their excellent mechanical and corrosion properties.[1,2] In Fe-Cr-Ni alloys, ferrite (d) is ferromagnetic, while austenite (c) is paramagnetic and both are highly alloyed.[3] The stability of austenite and ferrite in these alloys depends on the specific alloying additions and its partitioning into austenite
AMIT KUMAR, RAJESH KISNI KHATIRKAR, and AMAN GUPTA are with the Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), South Ambazari Road, Nagpur, Maharashtra 440010, India. Contact e-mails: [email protected], [email protected] SATISH K. SHEKHAWAT is with the Power Grid Corporation of India Limited, Engineering Technology Development, Saudamini, Gurgaon, Haryana 122001, India. SATYAM SUWAS is with the Department of Materials Engineering, Indian Institute of Science (IISc), Bangalore, Karnataka 560012, India. Manuscript submitted September 2, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS A
and ferrite. Austenite can undergo strain-induced martensite (SIM (a¢), diffusionless) transformation during cold rolling,[4,5] whi
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