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EXPLORING THE MECHANICAL PROPERTIES AND WEAR
RESISTANCE OF TRIP/TWIP MANGANESE STEELS
Turaxodjayev Nodir Djaxongirovich
,t.f.d., prof, Tashkent state technical university
tel: +998935530924
e-mail:
Tashbulatov Sherzod Baxtiyarovich
,t.f.f.d., dots, Tashkent state technical university
tel: +998998006637
e-mail:
t.sh.b.zohid@mail.ru
Yusupov Nuriddin Akmaljon ugli,
PhD student, Andijan state technical
institute, tel: +998999016152
e-mail:
Abstract :This article explores the impact of stacking fault energy (SFE) on
induced plasticity, encompassing strain hardening, grain size hardening, solid
solution hardening, and precipitation hardening in manganese steel displaying
TRIP/TWIP phenomena .
It demonstrates how TRIP and TWIP influence the mechanical and sliding
wear characteristics of manganese steel, noting that TWIP enhances strength via
improved plasticity .
The study highlights the significant role of microalloying elements in
intermetallic precipitation, which enhances the steel's hardness and strength,
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leading to improved sliding wear resistance in both lubricated and unlubricated
conditions .
Keywords: TRIP, Transformation Induced Plasticity; TWIP, Twinning
Induced Plasticity; SFE, Stacking Fault Energy; AHSS, Advanced High-Strength
Steels.
1. Introduction
Manganese steels, known for their high toughness, strength, wear resistance,
and non-magnetic properties, are utilized in various applications due to their work
hardening capabilities .
The focus in the automobile industry is shifting towards Advanced High-
Strength Steels (AHSS) like TRIP and TWIP steels, aiming to reduce vehicle
weight while enhancing strength and toughness .
While ferrite steels offer high elongation, manganese steels can achieve
strengths up to 1.8GPa through Intermetallic precipitation and can improve
toughness and ductility via TRIP and TWIP mechanisms .
2. Intermetallic Precipitation and Strengthening Mechanism
Intermetallic precipitation in steels is conducted after dissolving carbides and
nitrides in the austenite phase to avoid reducing the number of precipitates, which
would decrease strength .
Alloying elements like Nickel, Molybdenum, Niobium, Vanadium, and
Tungsten can form finer precipitates, leading to better refinement of
microstructures .
Larger precipitates can serve as nucleation sites for nanoprecipitation, and
hot-rolling enhances mechanical properties; however, rolling at higher
temperatures can lead to greater grain size and precipitate density .
3. TRIP/TWIP Steels
TWIP steels, characterized by high strain hardening, are promising candidates
for applications requiring multi-phase steel with austinites .
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Alloying elements like Copper, Niobium, Chromium, Nickel, Titanium,
Vanadium, and Boron enhance mechanical and tribological properties; Copper
increases retained austenite, while Aluminum increases SFE for the TWIP effect .
Stacking fault energy (SFE) is crucial for induced plasticity: low SFE leads to
TRIP steels, intermediate SFE to TWIP steels, and high SFE to MBIP steels .
4. Mechanical Properties of TRIP/TWIP Steels
Young’s modulus in TRIP/TWIP steels is temperature-dependent, decreasing
as temperature drops below the Neel temperature, and carbon has less impact on
Young’s modulus in Fe-Mn-C steels .
Microalloying with Niobium increases yield and tensile strength but decreases
elongation in Fe-25Mn-3Si-3Al steel, while increased cold reduction rolling and
annealing temperature can increase nanoscale mechanical twins .
Cold rolling can significantly increase yield and ultimate tensile strength,
though elongation may be restricted, and TRIP steels can achieve ultimate tensile
strengths up to 1100 MPa with total elongation of 35–40% .
5. Influence of Elements on TRIP/TWIP Phenomenon
Vanadium promotes twinning activity, improving mechanical properties, and
can exhibit both TRIP and TWIP phenomena with high UTS, YS, and TE when
used in medium manganese steel processed via cold rolling and intercritical
annealing .
Carbon and Manganese are austenite stabilizers that enhances lattice
parameters and may cause severe segregation, while Silicon reduces Neel
temperature and increases solid solution hardening .
Aluminium suppresses cementite precipitation, increases SFE, and delays
fracture, while Niobium and Molybdenum influence peak stress due to
precipitation and solid solution strengthening and can hinder grain growth .
6. Sliding Wear Assessment of Steels
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Ageing treatments significantly reduced wear rate due to intermetallic
precipitates, and sintered samples of high vanadium high speed steel showed
optimal tribological capabilities .
TRIP phenomenon significantly improved hardness and work hardening,
while thermo-mechanically processed samples possessed better wear resistance in
comparison with as cast samples .
Micro alloying and heat treatments increases wear resistance and hardness of
the steel, and increased austenitization temperature results in higher yield strengths
and wear resistance .
7. Conclusion
Manganese steels are valued for their hardness, strength, and wear resistance,
making them suitable for applications in demanding environments, with induced
plasticity achieved by adjusting SFE values for TRIP, TWIP, and MBIP .
TWIP steels benefit from annealing and deformation-induced twins, and grain
refining and precipitation hardening can further enhance strengthening processes .
Microalloying elements like Niobium, Molybdenum, and Vanadium
significantly alter the TRIP/TWIP phenomena, leading to potentially greater
sliding wear resistance due to hardness, intermetallic precipitants, and induced
plasticity .
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