Study on manufacture process and mechanical property of crusher ring-hammer

被引：0
|
作者：
Li S. [1 ]
Gan Y. [1 ]
Li Y. [1 ]
Li Z. [2 ]
Song J. [1 ]
机构：
[1] College of Material Science and Engineering, Taiyuan University of Science and Technology
[2] Shanxi Equipment Factory of Electric Power
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2010年 / 46卷 / 04期
关键词：
Composite modification; Crusher ring-hammer; Lost foam casting of iron-sand molding; Multi-element micro-alloying; Precipitation strengthening process;
D O I：
10.3901/JME.2010.04.054
中图分类号：
学科分类号：
摘要：
In view of the weakness of ring-hammer such as cracks, breakages, poor wear resistance and short service lifet, a high wear-resistant steel with initial hardness up to HB 210 and impact ductility above 215 J·cm-2 is developed successfully, which is based on the high manganese steel with the addition of alloy agents and composite modification, by designing component, designing processes which include a new lost foam casting process of iron-sand molding & spiral-ring chill and a heat treatment for precipitation strengthening. The results show that after multi-element microalloying and composite modification, second hard phase particles such as alloy carbides are formed and dispersively distributed in the austenitic matrix, thereby strengthening the matrix and improving the initial hardness of material. When iron sand is adopted for molding, it not only has the inherent characteristic of molding sand but also plays the function of metal mold, so that the grains of casting are refined, and the microstructure density is improved. The production practice shows that the properties of the ring-hammer produced on the basis of such technique can be obtained as follows: tensile strength σb=724 MPa, impact toughness αk=219 J·cm-2, percentage elongation δ=37%, Brinell hardness 210 HB respectively after precipitation strengthening treatment by water quenching at 1080°C for 4 h and tempering at 320°C for 3 h, which can meet the application requirements, the products have good wear-resistant property in practical application and obvious market competitive advantage. © 2010 Journal of Mechanical Engineering.
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页码：54 / 59
页数：5
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