Transactions of Materials and Heat Treatment

Title：Analysis on fracture failure of N02200 plate in thermal processing

Authors： Yang Zhe Li Gui Zhang Shuzhi Yang Han Chen Wei

Unit： Baoji Titanium Group Co. Ltd. Taiyuan University of Technology

KeyWords： N02200 plate fracture failure graphitization non-metallic inclusions brittleness

ClassificationCode：TG339

year,vol(issue):pagenumber：2020,45(6):163-167

Abstract：

In order to study the cause of fracture for N02200 plate in the thermal processing, the fracture failure areas appearing on the part were sampled and analyzed, and its chemical composition, metallographical structure and fracture morphology were analyzed by chemical composition analysis, optical microscope, scanning electron microscope and energy spectrum analysis. The mechanism of fracture failure was studied. The results show that the graphitization transition of carbon in the metal and segregating at the grain boundaries caused by high-temperature heating for a long time, the excess alumina inclusions during melting and the Si-Ca-Mg-Al slag non-metallic inclusions introduced by the raw materials lead to brittleness of the grain boundary, which is the main reason for the failure of N02200 plate in the thermal processing. Furthermore, by controlling the cleanliness of raw materials to reduce the non-metallic inclusions and improving the melting technical process to reduce alumina inclusions and adjusting the heating procedure to decrease the heating time, all kinds of inclusions at the grain boundaries are reduced and the thermal processing performance is improved.

Funds：

杨哲（1986-），男，学士，工程师 E-mail：baotailangzi@163.com

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