Fe/C配比对等离子堆焊Fe-Cr-C合金组织及性能的影响
Influence of Fe/C Ratio on Microstructure and Properties of Plasma Hardfacing of Fe-Cr-C Alloy
- 2022年52卷第11期 页码:37-42
收稿:2022-09-25,
纸质出版:2022-11-25
DOI: 10.7512/j.issn.1001-2303.2022.11.06
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收稿:2022-09-25,
纸质出版:2022-11-25
移动端阅览
研制了一种Fe-Cr-C合金粉块,粉块化学成分中
w
(Cr)/
w
(C)为5∶1,仅改变Fe/C配比,并采用等离子焊机在Q235钢板表面进行铺粉堆焊试验。采用金相显微镜、光谱仪(OES)、磨损实验和硬度检测等方法,研究Fe/C配比对Fe-Cr-C堆焊合金组织及性能的影响。结果表明:Fe元素在熔敷过程中起到助熔作用,当不添加Fe粉时,焊道无法成形;当Fe/C配比为4∶1时,焊道成形最好,堆焊合金中析出的M
7
C
3
型碳化物晶粒尺寸细小,弥散分布在马氏体基体表面;随着Fe/C配比的提高,Fe的助熔作用会减少堆焊合金烧损,但是C含量的降低导致显微组织中硬质相尺寸增大。当Fe/C配比为10∶1时,由于硬质相缺碳严重,形成M
23
C
6
型碳化物,耐磨粒磨损性能变差。
The plasma transfer arc (PTA) was used to hardfacing self-developed wear-resistant alloy powder on Q235 steel
with
w
(Cr)/
w
(C) at 5∶1
the influence of Fe/C ratio on the microstructure and mechanical properties of the deposited metal was studied. The metallographic microscope
spectrometer (OES)
wear-resistance experiment and hardness detection were used in this study. The results show that the Fe elements play an effective melting role in the melting process
when no Fe powder is added
the bead can not be formed; while the Fe/C ratio is 4∶1
the bead is well formed
M
7
C
3
carbide grain is small size and well distributed on the surface of the martenite matrix; with the increase of the Fe/C ratio
the melting aid of Fe element will reduce the burning proportion of the hardfacing alloy
however
the reduced weight percentage of C elements leads to the increased size of the hard phase grains in microstructure
when the Fe/C ratio is 10∶1
the M
23
C
6
carbides are formed
and the wear resistance deteriorates.
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