scholarly journals Accelerated Spheroidization of Cementite in Sintered Ultrahigh Carbon Steel by Warm Deformation

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 328
Author(s):  
Piotr Nikiel ◽  
Stefan Szczepanik ◽  
Grzegorz Korpała
Keyword(s):  
Carbon Steel ◽  
Strain Rate ◽  
Strain Rate Range ◽  
Liquid Phase Sintering ◽  
Petch Relation ◽  
Industrial Processing ◽  
Ultrahigh Carbon Steel ◽  
Accelerated Spheroidization ◽  
Evolution Of Microstructure ◽  
Time And Energy

Evolution of microstructure and hardness in quenched ultrahigh carbon steel Fe-0.85Mo-0.6Si-1.4C by warm compression on a Bähr plastometer-dilatometer at 775 °C and at 0.001 to 1 s−1 strain rate range is reported. The material was prepared via powder metallurgy: cold pressing and liquid phase sintering. Independent of strain rate, the initial martenstic microstructure was transformed to ferrite and spheroidized cementite. Strain rate had an effect on size and shape of spheroidized Fe3C precipitates: the higher the strain rate, the smaller the precipitates. Morphology of the spheroidized carbides influenced hardness, with the highest hardness, 362 HV10, for strain rate 1 s−1 and the lowest, 295 HV10, for the lowest strain rate 0.001 s−1. Resultant microstructure and ambient temperature mechanical properties were comparable to those of the material that had undergone a fully spheroidizing treatment with increased time and energy consumption, indicating that it can be dispensed with in industrial processing. All our results are consistent with the Hall–Petch relation developed for spheroidized steels.

scholarly journals High Strain Rate - High Strain Response of an Ultrahigh Carbon Steel Containing 1.3% C and 3% Si

2003 ◽  
Vol 426-432 ◽  
pp. 841-846 ◽  
Author(s):  
Donald R. Lesueur ◽  
C.K. Syn ◽  
Oleg D. Sherby ◽  
Dong Wha Kum
Keyword(s):  
Carbon Steel ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Strain Response ◽  
Ultrahigh Carbon Steel

High-strain-rate superplasticity in ultrahigh-carbon steel containing 10 wt.% Al (UHCS-10Al)

1996 ◽  
Vol 34 (12) ◽  
pp. 1919-1923 ◽  
Author(s):  
Eric M. Taleff ◽  
Mamoru Nagao ◽  
Kenji Higashi ◽  
Oleg D. Sherby
Keyword(s):  
Carbon Steel ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Ultrahigh Carbon Steel

High-Strain-Rate Superplasticity of Big Grains in Spray Forming Ultrahigh Carbon Steel Contain 1.6wt.%Al(UHCS-1.6Al)

2012 ◽  
Vol 535-537 ◽  
pp. 639-642 ◽  
Author(s):  
Jun Wang ◽  
Hai Sheng Shi ◽  
Jing Guo Zhang
Keyword(s):  
Carbon Steel ◽  
High Strain Rate ◽  
Strain Rate ◽  
Grain Boundaries ◽  
High Strain ◽  
Spray Forming ◽  
Growing Up ◽  
Ultrahigh Carbon Steel

Abstract: Spray forming UHCS-1.6Al material has a refined equiaxed pearlitic structure, which was necessary for high-train-rate superplasticity. During deformation, the cementite particles pin the grain boundaries and prevent the grains growing up. As a result it exhibited excellent high-strain-rate superplasticity, with a peak ductility of 187% occurring at a strain rate of 5*10-3s-1.

Factors Influencing the Fatigue Behavior of Ferrous Laminates

1987 ◽  
Vol 109 (3) ◽  
pp. 244-251 ◽  
Author(s):  
J. Wittenauer ◽  
O. D. Sherby
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Carbon Steel ◽  
Fatigue Behavior ◽  
Layered Material ◽  
Factors Influencing ◽  
Ultrahigh Carbon Steel ◽  
Processing History ◽  
Crack Blunting ◽  
Similar Processing

Laminates based on ultrahigh carbon steel were prepared and found to exhibit enhanced fatigue life as compared to a monolithic reference material. This result was achieved through the insertion of weak interlaminar regions of copper into the layered material during preparation of the laminates. The presence of these regions allowed for the operation of a delamination mechanism in advance of the propagating fatigue crack. The result was interlaminar separation and associated crack blunting. Stress-life curves show that an increase in life by as much as a factor of four is achieved for these materials when compared to monolithic specimens of similar processing history.

scholarly journals A High-Strain-Rate Superplasticity of the Al-Mg-Si-Zr-Sc Alloy with Ni Addition

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2028
Author(s):  
Andrey Mochugovskiy ◽  
Anton Kotov ◽  
Majid Esmaeili Ghayoumabadi ◽  
Olga Yakovtseva ◽  
Anastasia Mikhaylovskaya
Keyword(s):  
Strain Rate ◽  
Volume Fraction ◽  
Strain Rate Range ◽  
Zener Pinning ◽  
Nucleation Effect ◽  
Pinning Effect ◽  
Ni Addition ◽  
Elongation To Failure ◽  
Mean Size ◽  
High Temperature Tensile

The current study analyzed the effect of Ni content on the microstructure and superplastic deformation behavior of the Al-Mg-Si-Cu-based alloy doped with small additions of Sc and Zr. The superplasticity was observed in the studied alloys due to a bimodal particle size distribution. The coarse particles of eutectic origin Al3Ni and Mg2Si phases with a total volume fraction of 4.0–8.0% and a mean size of 1.4–1.6 µm provided the particles with a stimulated nucleation effect. The L12– structured nanoscale dispersoids of Sc- and Zr-bearing phase inhibited recrystallization and grain growth due to a strong Zener pinning effect. The positive effect of Ni on the superplasticity was revealed and confirmed by a high-temperature tensile test in a wide strain rate and temperature limits. In the alloy with 4 wt.% Ni, the elongation-to-failure of 350–520% was observed at 460 °C, in a strain rate range of 2 × 10−3–5 × 10−2 s−1.

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