Effects of modification on microstructure and properties of ultrahigh carbon (1.9 wt.% C) steel

被引：17
|
作者：
Liu, K. P. [1 ]
Dun, X. L. [1 ]
Lai, J. P. [1 ]
Liu, H. S. [1 ,2 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent South Univ, Sci Ctr Phase Diagram & Mat Design, Changsha 410083, Hunan, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 28期
关键词：
Microanalysis; Steel; Grain refinement; Phase transformation; Wear; WHITE CAST-IRON; TRANSFORMATION; MORPHOLOGY; ANCIENT;
D O I：
10.1016/j.msea.2011.07.038
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of a modifier that contains Rare Earths (RE), low melting point alloy (Al-Bi-Sb) and Ca-Si alloy on an ultrahigh carbon steel containing 1.9 wt.% C were studied. Microstructure characterization was carried out with optical microscopy (OM) and scanning electronic microscopy (SEM) combined with energy-dispersive spectrometry (EDS). Upon modification, the continuous eutectic carbide network structure was broken up and changed to a partly isolated and finer blocky structure in the as-cast alloy. Differential scanning calorimetry (DSC) revealed that the eutectoid temperature increased and the eutectic temperature decreased for the modified alloy. Modification also improved the impact toughness of the tempered steel, with a significant increase from 6.5 to 12.6J cm(-2), despite the hardness remaining around 66 HRC. Furthermore, in pure sliding under loads of 20, 60 and 100 N for 600 s against a zirconia ball, the modified alloy shows slightly higher friction coefficient at all loads than the non-modified one. In addition, the friction coefficient for the steel specimen decreased with load from 20 N to 100 N attributing to a reduction in metallic wear and the formation of a thicker oxide film on the surfaces. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：8263 / 8268
页数：6
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