Composite materials (titanium based alloys)

1. A STUDY OF CORROSION BEHEVIOUR
TITANIUM BASED HYBRID POWDER
METALLURGY ALLOYS
Presented by
S. ARUNKUMAR 82112014008
S. GNANASEKARAN 821120114015
R. HARIPRASATH 821120114017
K. MADHESHWRAN 821120114315
Project Guide
Mr.S. Nelson Raja,B.E.,M.Tech(Ph.D),.
Asst. Professor,
Mechanical engineering,
KCE.
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2. Introduction
▪ Powder metallurgy is a material processing technique. It is the process of forming metal parts by
heated compacted metal powders to just below their melting point.
▪ P/M have permitted the attainment of compositions and properties not possible by the conventional
methods of melting and casting. P/M techniques produces some parts which cannot be made by any
other method.
▪ High hardenability
▪ High compressibility
▪ High density
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3. Literature Review
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Paper Details Authors Findings
"The effects of
alloying elements and
microstructure on the
impact toughness of
powder metal
steels”(2012)
Have investigated the effects of Cr, Mo,
and Ni on the impact toughness and
microstructure of PM steels. Seven
powder mixtures (Fe, Fe–C, Fe–Mo–C,
Fe–Cr–C, Fe–Ni–C, Fe–Mo–Ni–C, and
Fe–Cr–Ni–C) by mixing the base Fe
powder . It was reported that for binary
Fe–C steels, both Cr and Ni improved the
impact toughness and tensile strength.
"Tensile and impact
behaviour of sinter-
forged Cr, Ni and Mo
alloyed powder
metallurgy steels”
(2009)
The have investigated the effect of
addition of Cr, Ni and Mo on the
mechanical properties of the P/M steel
powders. Alloying elements Cr, Ni and
Mo have strong influence on the tensile
and impact properties of the low-alloy
steels studied. Among all alloys the steel
with chromium content had the highest
tensile strength with the corresponding
impact strength.

4. Effect of Alloying Elements
Graphite (C) Directly influences the hardness and strength of the steel, decreases
toughness.
Manganese
(Mn)
Increases solid-solution strength, hardness as well as hardenability. steel
with improved wear and abrasion resistance.
Molybdenum
(Mo)
Increases yield point and strength. Improves Hardenability and wear
resistance
Nickel (Ni) Increases toughness at lower temperatures, slows the corrosion process.
Improves toughness, grain structure, high temperature strength, wear
resistance.
Silicon (Si) It is a deoxidizing agent. Increases strength and wear resistance.
Chromium Improves Hardenability, high temperature strength, wear resistance and even
corrosion resistance(Cr>14%).
Titanium Increases wear resistance, high temperature strength, retention of hardness.
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5. Objectives
● To study the impression and electro chemical corrosion behaviour
• To study the powder characteristics of P/M alloy steels based on ASTM standards.
• To study the effect of graphite and Titanium on P/M alloy steels.
• To study the effect of conventional sintering on mechanical properties of P/M alloy steels.
• To study the microstructures, XRD and SEM images of the test specimens of alloy steels
and correlate with the mechanical properties.
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6. Methodology
Material selection
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Blending
Powder Characterization
Compressibility Studies
Compaction
Conventional Sintering
Study on corrosion behaviour
Analysis on Microstructure SEM and XRD
Analysis of corrosion behaviour
Preparation of test specimen
Conclusion

7. Works Completed
• Literature survey
• Material selection
• Process selection
• Material ordered
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8. Works to be done
• P/M alloy mixing
• Powder characterization studies
• Compaction
• Conventional sintering
• Analysis corrosion behaviour
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9. References
1. Wu, Ming-Wei, Lung-Chuan Tsao, and Shih-Ying Chang. "The influences of
chromium addition and quenching treatment on the mechanical properties and
fracture behaviors of diffusion-alloyed powder metal steels." Materials Science and
Engineering(2013).
2. Desbiens, Jean, et al. "Effect of green machining on the tensile properties and
fatigue strength of powder metallurgy sinter-hardenable steel
components." Materials Science and Engineering (2012).
3. Erden, Mehmet Akif, et al. "Microstructural characterization and mechanical
properties of microalloyed powder metallurgy steels." Materials Science and
Engineering.(2014).
4. Wensheng Liu, Yunzhu Ma, Jiajia Zhang, Properties and microstructural evolution
of W-Ni-Fe alloy via microwave sintering, International Journal of Refractory
Metals and Hard Materials, Volume 35,(2012).
5. Manshor, Hanisah, et al. "Microwave sintering of zirconia-toughened alumina
(ZTA)-TiO2-Cr2O3 ceramic composite: The effects on microstructure and
properties." Journal of Alloys and Compounds(2017).
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