Long Nguyen Nhut Phi, Ngon Dang Thien, C. L. Chi, Phoi Nguyen Vinh
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引用次数: 2
摘要
用JIS S45C轧钢经普通淬火工艺制成的小型机械零件,通常有裂纹缺陷,硬度低于52 HRC,令人不满意。热处理工艺造成的材料组织不理想,如沿轧制方向(RD)和横轧方向(TD)的不均匀和粗晶。这主要是由于轧制后产生的强织构组织。本文介绍了热处理工艺,允许去除强织构,实现晶粒细,硬度高,无裂纹。这一过程包括三个阶段:(i)在950°C下正火15分钟以去除纹理;(ii)在840°C和760°C下分别正火15分钟和15分钟,使晶粒均匀,尺寸从10到20 m t m;(iii)在850℃淬火15分钟,然后在水中迅速冷却,硬度为56 ~ 58 HRC。
Solution for Heat Treatment in Quenching Process of S45C Steel Small Diameter Machine Parts Having Strong Texture
Small machine parts, made of the JIS S45C rolled steel after common quenching process, have usually crack defects and unsatisfactory hardness of less than 52 HRC. The heat treatment processes give unsatisfactory material structure, such as inhomogeneous and coarse-grained along rolling direction (RD) and traverse direction (TD). This is mostly due to the strong texture microstructure, generated after rolling. This paper represents the heat treatment process, allowing to remove the strong texture to achieve fine grains and high hardness without cracks. This process includes three stages: (i) normalising at 950°C for 15 minutes to remove the texture; (ii) normalising twice at 840°C for 15 minutes and 760°C for 15 minutes, giving grain homogeneousness and the sizes from 10 to 20 m t m; and (iii) quenching at 850°C for 15 minutes and then rapidly cooling in water to obtain hardness from 56 to 58 HRC.