Improving the properties of a rapidly crystallized NiCrBSi laser clad coating by high-temperature processing

被引：8
作者：
Makarov, A., V [1 ,2 ,3 ]
Soboleva, N. N. [1 ,3 ]
Malygina, I. Yu [1 ]
Kharanzhevskiy, E., V [4 ]
机构：
[1] Russian Acad Sci, Inst Engn Sci, Ural Branch, 34 Komsomolskaya St, Ekaterinburg 620049, Russia
[2] Russian Acad Sci, MN Miheev Inst Met Phys, Ural Branch, Ekaterinburg, Russia
[3] Ural Fed Univ, Ekaterinburg, Russia
[4] Udmurt State Univ, Izhevsk, Russia
来源：
JOURNAL OF CRYSTAL GROWTH | 2019年 / 525卷
基金：
俄罗斯科学基金会;
关键词：
Solidification; Surface structure; Eutectics; Dendrites; Growth from solutions; Alloys; WEAR-RESISTANCE; HEAT-TREATMENT; MICROSTRUCTURE; HARDNESS; PHASES;
D O I：
10.1016/j.jcrysgro.2019.125200
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The influence of the processes of dissolution/precipitation of strengthening phases during high-temperature treatment of NiCrBSi laser clad coating on the microhardness and tribological characteristics during sliding over the fixed abrasive is considered. Rapid melt solidification during laser cladding contributes to the development of thermally activated phase transformations. Heating to 1000 degrees C causes the Ni3B dissolution a decrease in microhardness and resistance to abrasive wear of the coating. With a gradual decrease in the cooling rate from 1000 degrees C (cooling of the samples in air, in a muffle and in a vacuum furnace), nickel borides and silicides are precipitated and the hardest strengthening CrB and Cr7C3 phases are coarsened. This leads to an increase in hardness and wear resistance of the coating.
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页数：5
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