Transactions of Materials and Heat Treatment

Title：Preheat treatment process optimization based on forging legacy effect for automobile steering piston

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ClassificationCode：TG311

year,vol(issue):pagenumber：2020,45(7):182-186

Abstract：

For the phenomenon that the coarse microstructure and mixed crystal frequently occur in the delivery for a certain type of automobile steering piston, the forging and preheat treatment processes were analyzed and studied by combining theoretical analysis and experimental research. According to the technological characteristics of steering piston forming process, combining with the relationships among deformation amount, deformation temperature and recrystallization, the recrystallization states in different deformation positions were analyzed, and the shortage of present forging waste heat normalizing process was pointed out in principle. Based on the mechanism of austenite nucleation, growth and homogenization, combining with the requirements of undercooled austenite decomposition, the three-step preheat treatment process scheme of steering piston including heating, air cooling and isothermal transformation was designed, and the preheat treatment process of steering piston was optimized to eliminate the legacy effect caused by forging, which provided technical guarantee for the practical mechanical processing and carburizing and quenching.

Funds：

国家自然科学基金资助项目（51905427）

毛胜辉（1972-），男，硕士，副教授 E-mail：msh008@126.com

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