Effect of Destabilization Heat Treatments on the Microstructure of High-Chromium Cast Iron: A Microscopy Examination Approach

被引:54
|
作者
Karantzalis, A. E. [1 ]
Lekatou, A. [1 ]
Diavati, E. [1 ]
机构
[1] Univ Ioannina, Dept Mat Sci & Engn, Lab Appl Met, GR-45110 Ioannina, Greece
关键词
cast iron; destabilization treatment; high chromium; secondary carbides; ABRASION RESISTANCE; SECONDARY CARBIDES; WHITE; PRECIPITATION;
D O I
10.1007/s11665-009-9353-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A 18.22 wt.% Cr white iron has been subjected to various destabilization heat treatments. Destabilization at 800 A degrees C caused gradual precipitation of M23C6 secondary carbide particles with time leading to a gradual increase in the bulk hardness. At 900, 1000, and 1100 A degrees C, an initial sharp increase in bulk hardness with time occurred, reaching a plateau that was followed by a slightly decreasing trend. The combination of martensite formed, stoichiometry, and morphology of the secondary carbides present (mostly M7C3) are responsible for the obtained values of hardness. At 1100 A degrees C, severe dissolution of the secondary carbides and consequent stabilization of the austenitic phase took place. Maximum hardness values were obtained for destabilization at 1000 A degrees C. The correlation between bulk hardness and microstructural features was elaborated.
引用
收藏
页码:1078 / 1085
页数:8
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