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800mm厚塑料模具钢3Cr2MnNiMo经调质处理后,内部组织由回火索氏体、回火下贝氏体和粒状贝氏体组成,组织不均匀是由于合金元素的微观偏析,随偏析程度的增加,局部显微硬度值增高。样品经机械抛光后表面的三维形貌显示从基体至元素偏析区表面逐步隆起;粒状贝氏体区的局部光洁度最高,回火下贝氏体最低。经高温扩散退火处理后,显微硬度均匀性显著提高。
800mm thick plastic mold steel 3Cr2MnNiMo after quenching and tempering, the internal organization by the tempered sorbite, bainite tempered bainite and granular composition, the microstructure is uneven due to the micro-segregation of alloying elements, with the degree of segregation increased , Local microhardness value increased. The three-dimensional morphology of the surface of the sample after mechanical polishing showed gradual swelling from the surface of the substrate to the segregation area of the element; the granular bainite area had the highest local finish and the lowest bainite under the tempering. After high-temperature diffusion annealing, microhardness uniformity increased significantly.