Effect of tempering temperature on microstructure and properties of composite steel plate for saw blade

doi:10.13251/j.issn.0254-6051.2020.02.042

Abstract

Abstract:

The composite steel plate for saw blade rolled by 45Mn2V/Q345 steel was tempered. The strength and elongation of the specimens tempered at different temperatures were measured, and the microstructures were observed, then the effect of tempering temperature on the microstructure and tensile properties of tested steel was analyzed. The results show that acicular martensite is obtained after quenching for 45Mn2V steel acting as clad layer and lath martensite is formed on Q345 steel used as substrate. Tempered at a temperature below 400 ℃, the carbides precipitated in 45Mn2V are fine and uniform and coarsened obviously after tempering at a higher temperature, then large amount of coarsening carbides can be observed when tempered at 480 ℃, which results in the strength of tested steel decreasing with the increase of tempering temperature, but increasing obviously at 480 ℃. On the other hand, the coarsening of martensite lath occurs mainly in the substrate steel, and the equiaxed recrystallized grains appear after tempered at 480 ℃. However, the change can not improve the plasticity of clad steel plate.

Key words: steel for saw blade, clad steel plate, tempering treatment, microstructure and properties

CLC Number:

TG156.5

Yang Yuehui, Yuan Shaoqiang, Guo Jifu, Han Huijie, Zhang Yanlong. Effect of tempering temperature on microstructure and properties of composite steel plate for saw blade[J]. HTM, 2020, 45(2): 214-217.

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