Abstract
The paper presents the results of research on the influence of multistage heat treatment of different types on the microstructure and properties of high-chromium martensitic GX12CrMoVNbN9-1 (GP91) steel. The materials under investigation were samples taken from a test coupon. The heat treatment of GP91 cast steel was performed for the temperature and time parameters typical of the treatment of multi-ton steel casts. The results of our research proved that, in the as-cast state, GP91 cast steel is characterized by a coarse-grain microstructure of lath martensite with precipitations of carbides, such as M23C6 , M3C , and NbC. The cast-steel microstructure in the as-cast state ensured the required standard mechanical properties. The heat treatment of GP91 cast steel contributed to getting a fine-grain microstructure of high-tempered lath martensite with numerous precipitations of M23C6 and MX carbides of diverse sizes. The structure of GP91 cast steel received as a result of heat treatment makes it possible to obtain high plastic properties, mainly impact strength, by maintaining its strength properties (yield strength) on the required minimum level.
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