Effect of heat treatment on low carbon steel
This work was to investigating the corrosion behavior of low carbon steel in a salt solution of 3.5wt% NaCl after undergoing two different types of heat treatment at 960 °C in a furnace. The material of low carbon steel was cut into nine small pieces under three groups A, B and C, without heated...
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| 主要作者: | |
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| 格式: | Thesis |
| 語言: | English |
| 出版: |
2013
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| 主題: | |
| 在線閱讀: | http://eprints.utem.edu.my/id/eprint/14965/1/Effect%20of%20heat%20treatment%20on%20low%20carbon%20steel.pdf |
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| 總結: | This work was to investigating the corrosion behavior of low carbon steel in a salt
solution of 3.5wt% NaCl after undergoing two different types of heat treatment at 960 °C in a
furnace. The material of low carbon steel was cut into nine small pieces under three groups A,
B and C, without heated annealing and hardening heat treatment respectively. The heat
treatment was at temperature 960°C. The hardness of the sample as received will be 203
kg/mm2 while after hardening the hardness was increased. The sample was mounted using hot
and cold mounting. The microstructure and surface morphology was observed by using
Scanning Electron Microscope (SEM) and Optical Microscope (OM) after grinding, polishing
and etching on the sample. In group A cementite can be observed clearly on pearlite on the
surface before corrosion test. After four days soaking in 3.5 wt% NaCl solution was observed
all cementite and pearlite will be transformed to austenite with the remnants of cementite
make the surface unstable hence increases the initial corrosion. After four days soaking when
the cementite is oxidized and a thick film of corrosion product covers the material surface.
The formation of Martensite due to quenching and rapid cooling in group C sample increases
the corrosion rate from 0.072 mpy to 0.302 due to decreased of corrosion potential from -572
m V to -639 m V after four days soaking. The corrosion rate of each sample was measured by
using electrochemical polarization measurement and Tafel extrapolation technique. From
previous result, it was observed that samples which had undergone annealing mode of heat
treatment turned out to be the ones with the best corrosion resistance |
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