Abstract
A possibility of grain refinement utilizing the grainboundary reaction (GBR) by thermal cycling was investigated on high-nitrogen austenitic 21Cr-4Ni-9Mn steels. A thermal cycle employed in this study was composed of the ageing at 973 K or 1173 K, which caused about 50% of GBR in area fraction, and the short-time resolution heating (180 or 600 s) at 1473 K. The pearlitic nodules containing Cr 2 N nitride were formed by GBR during ageing in these steels. The number of the GBR nodules formed during ageing at 973 K was larger than that of the nodules formed at 1173 K when the amount of GBR was about 50%, and this led to a little smaller grain size produced by thermal cycling which involved the ageing at 973 K
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