Heredity in the Microstructure and Mechanical Properties of Hot-rolled Spring Steel Wire 60Si2MnA during Heat Treatment Process

doi:10.1016/j.jmst.2012.12.012

Abstract

Abstract:

Heredity in the microstructure and mechanical properties of hot-rolled spring steel wire 60Si2MnA during heat treatment process was investigated comprehensively. The steel was isothermally transformed to obtain various hot-rolled microstructure (pearlite fineness within the range of 140–510 nm) and mechanical properties, and followed by some quenching–tempering treatment. Afterwards, microstructure was characterized by optical microscopy, scanning electron microscopy and quantitative metallography, and mechanical properties were determined by tensile test. The results indicated that the hot-rolled microstructure with a coarsen pearlite structure had been changed after reheating, to a austenite microstructure with bigger and more uneven grain size, and finally to a coarsen tempered microstructure. And the average austenite grain size and standard deviation of its distribution in quenched microstructure were observed to depend linearly on the interlamellar spacing in hot-rolled microstructure. Besides, to obtain a good combination of the final strength and plasticity, an optimum value range (190–280 nm) of the interlamellar spacing had been determined for the interlamellar spacing in hot-rolled microstructure.

Key words: Spring steel, Hot-rolling, Heat treatment, Microstructure, Mechanical properties, Heredity

Chaolei Zhang, Leyu Zhou, Yazheng Liu. Heredity in the Microstructure and Mechanical Properties of Hot-rolled Spring Steel Wire 60Si2MnA during Heat Treatment Process[J]. J. Mater. Sci. Technol., 2013, 29(1): 82-88.

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Heredity in the Microstructure and Mechanical Properties of Hot-rolled Spring Steel Wire 60Si2MnA during Heat Treatment Process

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