Transactions of Materials and Heat Treatment

Title：Influence of local forging and deformation heat treatment process on microstructure and mechanical properties for Hadfield steel frogs

Authors： Tang Tiebing

Unit： China Railway Shanhaiguan Bridge Group Co. Ltd.

KeyWords： Hadfield steel frog local forging deformation heat treatment microstructure mechanical property

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2022,47(9):211-217

Abstract：

The core rail and wing rail at the position where the Hadfield steel frog was most likely to fail during the service process were increased by 30 mm by casting technology, and the elevated area of frog was depressed and deformed by the high temperature deformation heat treatment process to make it match the height of the unelevated area. Then, the Hadfield steel frogs were treated by three different processes: immediate water toughening, water toughening after returning to furnace and holding at 1100 ℃ for 7 min, and water toughening after returning to furnace and holding at 1100 ℃ for 25 min. Furthermore, the microstructures for deformed and undeformed areas of the frogs in the three different states were observed, and their corresponding mechanical properties were tested. Results show that the microstructure of the deformed areas for frogsafter local forging and deformation heat treatment is obviously refined, and the mechanical properties are significantly improved. For the studied hadfield steel frogs in the three deformation states, the frogs with water toughening after returing to furnace and holding at 1100 ℃ for 7 min after deformation have the most obvious performance improvement at the top of the deformed area with the tensile strength of 986 MPa and the elongation of 51.1%. Compared with the undeformed area for frogs, they are increased by 34.1% and 46.8%, respectively.

Funds：

河北省重点研发计划资助项目（19211018D，20311002D）

汤铁兵（1978-），男，学士，高级工程师 E-mail：11915179@qq.com

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