EFFECT OF Nb ON THE PROPERTIES OF A LARGE-SIZED GRINDING BALL

被引：0

作者：

Song, Mengchao ^{[1
]}

Zheng, Gaofeng ^{[1
]}

Wang, Ran ^{[1
]}

Pu, Yisong ^{[1
]}

Wang, Baoqi ^{[1
]}

Tian, Yahong ^{[2
]}

机构：

[1] Hebei Univ Technol, Sch Mat Sci & Engn, 8 Dingzigu Rd, Tianjin 300130, Peoples R China

[2] Hebei Univ Technol, Sch Chem Engn & Technol, 8 Dingziguyihao Rd, Tianjin 300130, Peoples R China

来源：

MATERIALI IN TEHNOLOGIJE | 2019年 / 53卷 / 05期

关键词：

grinding balls; prior-austenite grain size; microalloying element; hardenability; MECHANICAL-PROPERTIES; MEDIA; MICROSTRUCTURE; FLOTATION;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Grinding balls are widely used in the mining industry due to their favorable properties; however, poor hardenability of large-sized grinding balls is a limitation in wide applications. The hardenability and hardness of large-sized grinding balls can be affected by microalloying elements. In this work, Nb microalloying was used to improve the mechanical properties of large-sized grinding balls. The microstructures and mechanical properties of Nb-containing grinding balls were studied in contrast to the Nb-free steel. Typical microstructures were observed with OM and SEM, respectively. The hardness was obtained with a Rockwell hardness tester. The results show that the typical microstructure of a large-sized grinding ball was mainly martensite and that the fracture surface consisted of dimples of different sizes. The prior-austenite grain size (PAGS) was decreased from 31.5 mu m to 22.6 mu m by adding 0.04 % Nb with a refined microstructure.

引用

页码：733 / 737

页数：5

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