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首页> 外文期刊>ISIJ International >Ultra-fine {alpha+theta} duplex structure formed by cold rolling and annealing of pearlite
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Ultra-fine {alpha+theta} duplex structure formed by cold rolling and annealing of pearlite

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摘要

The ferrite (a)+cementite (B) microduplex structure formed by heavy cold rolling and annealing of pearlite was studied in an Fe-1.4Cr-1.0C (mass percent) alloy. Cold-rolled pearlite structure is inhomogeneous consisting of three components; (1) irregularly bent lamellae (IBL), (2) coarse lamellae with shear band (CLS) and (3) fine lamellae (FL) as was previously reported by the present authors. Misorientation in a is large in the IBL and near the shear band in the CLS. As rolling reduction increases, the proportion of FL increases. By annealing at 973 K after heavy cold rolling, the (alpha+theta) microduplex structure with a and 6 grain sizes less than 0.5mu m is formed. This structure consists of a coarse grain region (da~0Afj.m) containing high-angle a boundaries and a fine grain region (d a~0.2mu m) with low-angle a boundaries by inheriting local orientation distribution in the deformed a structure. The coarse grain region is formed at the deformed region where local misorientation in a is large essentially by recovery under pinning by 0 particles. As the annealing is prolonged, the fraction of the coarse grain region increases. The cold-rolled and annealed pearlite exhibits a wide range of strength-ductility balance.

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