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Vol.35, No.11, 1561 ~ 1569, 1997

Title

Hot Rolling of TiAl Base Intermetallic Compounds using the Pack Rolling Method

김승언 , 오명훈 , 황승준 , 이용태 Seung Eon Kim , Myung Hoon Oh , Seung Joon Hwang , Yong Tai Lee

Abstract

Hot rolling process using the pack rolling method was studied to obtain an optimal microstructure in TiAl base alloys, Stainless steel was used for canning. Rolling was conducted when the can surface temperature reached until 800℃ from the soaking at 1050℃. The average strain rate was 3x10^(-1)s^(-1) and a reduction per one pass was amounted to 10% with respect to remaining sample thickness. Rolling process was controlled to make the flow stress condition of the sample and canning material same. As a result, successful pack rolling to 80% reduction of the sample without cracking was accomplished. However, this success depends upon the starting microstructure. The alloy with duplex (gamma+lamellar) microstructure was rolled up to 80%o reduction, while the one with nearly lamellar microstructure was failed to roll successfully. It can be argued that lamellar grains oriented to a hard mode deformation yield locally higher flow stress than the other part of the sample. This leads to the difference in flow stress between can and sample, although the samples are not the PST single crystals. A difference in flow stress between can and sample is believed to yield a tensile residual stress condition on the sample surface and eventually Lead to cracking.

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