Microstructure and Properties of High Speed Steel Rolls

With the development of high-speed steel roll technology, the speed and automation of rolling mills have been continuously improved, which puts forward higher requirements for roll quality, especially roll wear resistance, strength, and toughness. How to improve the performance of the registration to meet the needs of the rolling mill is a new issue faced by the roll developers. High-speed steel composite rolls use high hardness, especially high-speed steel with good red hardness, wear resistance, and hardenability as the working layer of the roll, and use forged steel, alloy cast steel, and high-strength gray cast iron that meet the toughness requirements. Or high-strength ductile iron as the core material of the roll, a high-performance roll that combines the active layer and the core in a metallurgical combination.

Scholars have designed 5 kinds of high-speed steel roll materials, using an optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), and other analysis methods, and through testing, impact toughness test, wear test, the high-boron low-alloy high-speed The structure, performance and wear resistance of steel roll materials in the as-cast state and after tempering have been systematically studied. The results show that the as-cast structure of high-boron low-alloy high-speed steel roll material includes martensite matrix, retained austenite, and different kinds of carbon-boron compounds. The as-cast hardness is more significant than HRC64, and the carbon-boron compounds are distributed along the grain boundaries in a network shape.

 

High Speed Steel Rolls

 

After RE-Mg-Ti composite modification, the grain boundaries appear obvious necking and disconnection.

Tempering the roll material found that as the tempering temperature increased, the hardness of the roll decreased gradually. Under the same conditions, the toughness of the unmodified roll material is slightly lower than that of the modified roll material, and the addition of an excess modifier will reduce the toughness of the roll material. The wear test found that the wear resistance of the high-boron high-speed steel modified by the RE-Mg-Ti compound was greater than that of the high-carbon high-vanadium high-speed steel of the comparison sample.

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