Heat Treatment of Centrifugally Cast High-Vanadium Alloy Steel for High-Pressure Grinding Roller

doi:10.1007/s40195-014-0075-x

Abstract

Abstract:

The roller is one of the main parts of a high-pressure grinding roller, which is a type of highly efficient ore crushing equipment. Its working life is strongly affected by the materials used. In this paper, a new kind of roller material, the high-vanadium alloy steel (HVAS), was investigated. The results showed that the as-cast microstructures of the HVAS roller contained martensite, residual austenite, and alloy carbides. The HVAS sample quenched at 1,080 °C had a high hardness, and it had much higher compressive strength and abrasive wear resistance after tempering at 560 °C for 30 min. The mechanical properties of the HVAS are more sufficient than the existing roller materials, which are feasible for larger machine design.

Key words: High-vanadium alloy steel, Heat treatment, High-pressure grinding roller, Compressive strength, Abrasive wear resistance

Haizhi Li, Weiping Tong, Junjun Cui, Hui Zhang, Liqing Chen, Liang Zuo. Heat Treatment of Centrifugally Cast High-Vanadium Alloy Steel for High-Pressure Grinding Roller[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(3): 430-435.

Figures/Tables 8

Table 1 Chemical compositions of the HVAS roller (in wt%)

C	Si	Mn	Ni	Cr	Mo	V	Fe
1.0–3.0	0.7–1.0	0.7–3.8	2.5–5.6	4.5–7.6	4.1–8.0	5.1–9.4	Bal.

Fig. 1 Schematic diagram of heat treatment procedure in this study

Fig. 2 OM image showing the microstructure of as-cast sample a, SEM images showing the morphologies of carbides MC b, M2C c

Fig. 3 Effect of austenitizing time at 1,080 °C on hardness

Fig. 4 Effect of austenitizing time at 1,080 °C on compressive strength

Fig. 5 The compressive stress–strain curves of the samples were austenitized at 1,080 °C for 120 min and tempered at 560 °C for 30, 60, and 90 min

Fig. 6 SEM micrographs of fracture surface. a Scratch lines. b Microcracks

Fig. 7 Accumulated weight loss values of 45# steel (52 HRC), bainite ductile iron (55 HRC), HVAS (50 HRC), and HVAS (65 HRC) in the abrasion wear test using silica sand as abrasives

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