Ductile-brittle transition temperature of a grain-oriented silicon steel and its influencing factors

doi:10.13251/j.issn.0254-6051.2021.12.035

Abstract

Abstract: Ductile-brittle transition temperature and its influencing factors of 0.27 mm high magnetic grain-oriented silicon steel plate of Ansteel were determined by measuring the mechanical properties of specimen at different normalizing temperatures and observing the microstructure and fracture morphology. The results show that the critical breaking strength of the tested steel is about 590 MPa, and the ductile-brittle transition temperature range is 60-80 ℃. With the increase of test temperature in the range of 0-100 ℃, the phosphorus concentration decreases from about 90% to about 65%, and the corresponding equilibrium time is short, which is beneficial to improve the grain boundary bonding strength and to weaken the brittle fracture tendency. In addition, the coarsening of normalized grains and the microcracks caused by uneven deformation of ferrite and pearlite are the main structural factors of embrittlement, which are not conducive to cold rolling of grain-oriented silicon steel.

Key words: grain-oriented silicon steel, ductile-brittle transition temperature, fracture morphology, microstructure, mechanical properties

CLC Number:

TG142.7

Li Li, Jia Zhiwei, Zhang Yifan, Luo Li, Jiang Qiwu. Ductile-brittle transition temperature of a grain-oriented silicon steel and its influencing factors[J]. Heat Treatment of Metals, 2021, 46(12): 214-217.

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