Effect of quenching temperature on microstructure and mechanical properties of high-boron Fe-based alloy for roll

doi:10.13251/j.issn.0254-6051.2020.08.017

Abstract

Abstract: Effect of quenching temperature on the microstructure and mechanical properties of high-boron Fe-based alloy for roll was studied by means of optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), pendulum impact tester and Vickers hardness tester. The results show that the hardened matrix of high-boron Fe-based alloy is martensite, while the boron carbides in the matrix, such as fishbone (M₂(B, C)), lamellar (M₂C), long (M₃(B,C)) and granular (M(B,C)), are tending to be disconnected. Compared to the as-cast, among them the change of lamellar boron carbide is the most obvious, and its morphology changes from the dense and coarse continuous to loose and fine granular, which reduces the fragmentation of matrix. The type of boron carbides in the quenched structure of high-boron Fe-based alloy does not change, but the amount of precipitation decreases with the increase of quenching temperature. The hardness and impact property of the as-quenched high-boron Fe-based alloy are obviously higher than that of the as cast. The hardness and impact property of the matrix increase with the increase of the quenching temperature, while the macro-hardness increases first and then decreases with the increase of quenching temperature. Macro-hardness of the specimen quenched at 1050 ℃ reaches the maximum value of 63.1 HRC, while the maximum value of impact absorbed energy is 10.9 J, when quenched at 1150 ℃.

Key words: high-boron Fe-based alloy, roll material, quenching temperature, microstructure, mechanical properties

CLC Number:

TB332

Liang Yao, Yu Xiaohua, Chong Xiaoyu, Yuan Zhentao. Effect of quenching temperature on microstructure and mechanical properties of high-boron Fe-based alloy for roll[J]. Heat Treatment of Metals, 2020, 45(8): 86-90.

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