Effect of heat treatment process on microstructure and mechanical properties of a hypereutectoid steel for rail

doi:10.13251/j.issn.0254-6051.2020.12.004

Abstract

Abstract: Changing laws of microstructure and properties of a hypereutectoid steel for rail under different heat treatment processes were studied by means of microhardness tester, impact testing machine, universal testing machine and scanning electron microscope. The results shows that, compared with that of the states as rolled and as factory heat treated, the microstructure and mechanical properties of the tested steel are improved by heat treatment, and the main influencing factors are cooling rate and the decrease of isothermal time. With the increase of cooling rate and the decrease of isothermal time, the precipitation of cementite in the matrix increases, the size of pearlite decreases, and the large lamellar pearlite disappears gradually. In addition, the hardness, impact absorbed energy and tensile strength increase first and then decrease with the increase of cooling rate, showing a polyline trend, the roughness of tensile fracture increases, and the fracture mode changes from cleavage to quasi cleavage, while the impact absorbed energy increases with the increase of isothermal time. Finally, the optimum heat treatment process is the isothermal temperature of 630 ℃, isothermal time of 30 s, and cooling rate of 8 ℃/s. The corresponding mechanical properties are the best, with the hardness, the impact absorbed energy, the tensile strength, the elongation and the percentage reduction of area being 402 HBW, 2.9 J, 1312 MPa, 12.24% and 23.96%, respectively.

Key words: heat treatment, hypereutectoid steel for rail, microstructure, mechanical properties, fracture morphologies

CLC Number:

TG156.1

Cui Jianwei, Chen Lin, Zhao Leicheng, Zou Yun. Effect of heat treatment process on microstructure and mechanical properties of a hypereutectoid steel for rail[J]. Heat Treatment of Metals, 2020, 45(12): 19-23.

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