Abstract
To reduce warping of parts it is recommended [i] to cool them partially to not below 800°C before quenching. If parts are to be straightened, it is indispensable to ensure that their core is soft; this is possible if they are partially cooled to below the temperature Ar~ However, it may happen that~this is accompanied by loss of hardness of the nitrided case, which can be corrected by renewed heating to 30-50°C above Acl [2]. In connection with this it was of practical interest to investigate the effect of partial cooling and renewed heating before quenching on the structure, the hardness, and the warping of nitrided parts made of steel 25KhGM.
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