Study of the applicability of 22MnB5 sheet metal as protective masks to improve tool life in hot forging process
Study of the applicability of 22MnB5 sheet metal as protective masks to improve tool life in hot forging process
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DOI：
10.1007/s00170-020-05010-9
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发表时间：
2020-03-01
影响因子：
3.4
通讯作者：
Schaeffer, Lirio
中科院分区：
文献类型：
--
作者：
de Costa, Luana De Lucca;Brito, Alberto Moreira Guerreiro;Schaeffer, Lirio
低硼钢是唯一能够在热冲压后使用冷却工具形成完全马氏体显微组织的钢种，最大应力可达1500 MPa。本工作的目的是研究 22MnB5 金属板材作为热锻模具防护罩的适用性。将 1.3 毫米厚的板材切割成直径 110 毫米的样品，并在类似于直接热冲压的条件下进行热处理，然后放置在热锻模具上。进行了 25、50、75 和 100 次锻造循环，并且在每个循环中，更换金属掩模以进行表征。使用显微硬度分布、光学和电子显微镜显微图像分析以及轮廓测定分布来确定每个锻造周期后掩模上表面磨损的发生情况。表面磨损的主要类型是磨粒磨损和塑性变形。然而，面罩表现出高耐磨性，并且在研究 100 次锻件循环的条件之前不会出现导致其无法使用的故障。
Low boron steels are the only class of steel capable of forming a fully martensitic microstructure after hot stamping when a cooled tool is used, and the maximum stress can reach 1500 MPa. The purpose of this work is to study the applicability of 22MnB5 sheet metal as protective masks in hot forging dies. Sheets that were 1.3 mm thick were cut in samples of 110 mm diameter and heat treated in conditions similar to direct hot stamping and placed on the hot forging die. Cycles of 25, 50, 75, and 100 forgings were performed, and at each cycle, the metallic mask was replaced for characterization. Microhardness profiles, micrographic analysis by optical and electron microscopy, and profilometry profiles were used to determine the occurrence of surface wear on the masks after each forging cycle. The main types of superficial wear were abrasive and plastic deformation. However, the masks showed high resistance to wear and did not present failures that would make them unusable until the studied condition of a cycle of 100 forgings.