Mechanical Properties and Precipitation Behavior of Ti-Mo Microalloyed Medium-Carbon Steel during Ultrafast Cooling Process

2014 ◽  
Vol 922 ◽  
pp. 86-93
Author(s):  
Xiang Tao Deng ◽  
Zhao Dong Wang ◽  
R.D.K. Misra ◽  
Jie Han ◽  
Guo Dong Wang
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Precipitation Hardening ◽  
Medium Carbon Steel ◽  
Precipitate Size ◽  
Accelerated Cooling ◽  
Air Cooling ◽  
Cooling Process ◽  
Medium Carbon ◽  
Ultrafast Cooling

We describe here the mechanical property evolution and precipitation hardening behavior under different cooling conditions including ultrafast cooling (UFC) + air cooling process and accelerated cooling (ACC) + air cooling process in a Ti-Mo microalloyed medium carbon steel is described here. The results demonstrate that the cooling procedure after hot rolling has a significant influence on the mechanical properties of the microalloyed steel. The yield strength and tensile strength that were obtained by ultrafast cooling (UFC) + air cooling process were higher than those from accelerated cooling (ACC) + air cooling process, while the elongation was slightly reduced. Microstructural characterization indicated that grain refinement and precipitation hardening were the primary reasons for the increase in strength of the experimental steel. Ultrafast cooling increased the density of dislocations and refined the grain size. Average size of precipitates containing Ti and Mo was 3~6 nm in ultrafast cooling (UFC) + air cooling process, while average precipitate size obtained by accelerated cooling (ACC) + air cooling process was 6~9 nm. Keywords: Ti-Mo medium-carbon steel; Precipitation; Ultra fast cooling process; accelerated cooling process

Effect of Postweld Heat Treatment on the Mechanical Properties of Weld in a Medium Carbon Steel

2013 ◽  
Vol 315 ◽  
pp. 6-10 ◽  
Author(s):  
S.M. Manladan ◽  
B.O. Onyekpe
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Carbon Steel ◽  
Postweld Heat Treatment ◽  
Medium Carbon Steel ◽  
Air Cooling ◽  
Shielded Metal Arc Welding ◽  
Medium Carbon ◽  
Before And After ◽  
Postweld Heat

This paper presents the result of an investigation of the effect of postweld heat treatment on the mechanical properties of weld in 0.36%C medium Carbon Steel. Samples were prepared and welded using Shielded Metal Arc Welding (SMAW) process with a low hydrogen electrode. The welded samples were subjected to postweld heat treatment (stress relief) at four different temperatures: 550°C, 600°C, 650°C and 700°C followed by air-cooling. Microstructural examination was carried out to determine the change in microstructure before and after postweld heat treatment. The mechanical properties of the samples were also tested before and after the heat treatment. It was established that a hard microstructure, susceptible to Hydrogen Induced Cracking (HIC), was formed in the heat affected zone of the as-welded samples and that postweld heat treatment improved the mechanical properties of the weld and substantially reduced or eliminated the risk of HIC.

INFLUENCE THE QUENCHING AND TEMPERING ON THE MICROSTRUCTURE, MECHANICAL PROPERTIES AND SURFACE ROUGHNESS, OF MEDIUM CARBON STEEL

2018 ◽  
Vol 18 (1) ◽  
pp. 125-135
Author(s):  
Sattar H A Alfatlawi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Surface Roughness ◽  
Carbon Steel ◽  
Cold Water ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Heating And Cooling ◽  
Treatment Processes ◽  
Quenching And Tempering

One of ways to improve properties of materials without changing the product shape toobtain the desired engineering applications is heating and cooling under effect of controlledsequence of heat treatment. The main aim of this study was to investigate the effect ofheating and cooling on the surface roughness, microstructure and some selected propertiessuch as the hardness and impact strength of Medium Carbon Steel which treated at differenttypes of heat treatment processes. Heat treatment achieved in this work was respectively,heating, quenching and tempering. The specimens were heated to 850°C and left for 45minutes inside the furnace as a holding time at that temperature, then quenching process wasperformed in four types of quenching media (still air, cold water (2°C), oil and polymersolution), respectively. Thereafter, the samples were tempered at 200°C, 400°C, and 600°Cwith one hour as a soaking time for each temperature, then were all cooled by still air. Whenthe heat treatment process was completed, the surface roughness, hardness, impact strengthand microstructure tests were performed. The results showed a change and clearimprovement of surface roughness, mechanical properties and microstructure afterquenching was achieved, as well as the change that took place due to the increasingtoughness and ductility by reducing of brittleness of samples.

Effect of in situ formation of tungsten semicarbide on the microstructure and mechanical properties of medium carbon steel composites

2021 ◽  
Vol 118 (6) ◽  
pp. 606
Author(s):  
Nandish Girishbhai Soni ◽  
Akash Ganesh Mahajan ◽  
Kaustubh Ramesh Kambale ◽  
Sandeep Prabhakar Butee
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Wear Resistance ◽  
Carbon Steel ◽  
Sintered Density ◽  
Medium Carbon Steel ◽  
Complete Conversion ◽  
Medium Carbon ◽  
In Situ Formation

Fabrication with the in-situ formation of W2C reinforced medium carbon steel (MCS) MMC’s was attempted using W or WO3 and graphite addition to steel. The P/M route comprising milling, compaction and sintering at 1050 °C and 1120 °C respectively in 90% N2 + 10% H2 atmosphere was adopted. Both SEM and BET studies revealed the particle size to be around 100, 7 and 40 µm for MCS, W and WO3, respectively. A complete conversion of tungsten into tungsten semicarbide (W2C) was noted in XRD for the tungsten additions of ∼6, 9 and 12 wt.% with stoichiometrically balanced C (graphite) addition of 0, 0.2 and 0.4 wt.%. However, WO3 + C addition (balanced as above) revealed the partial conversion of WO3 to W2C. The peaks of Fe3C were observed only for MCS + W + C samples and not for MCS + WO3 + C samples in XRD. In SEM, the WO3 phase appeared porous and partially converted, whereas, W2C phase was dense. Sintered density improved for the addition of W, whereas it monotonically reduced for WO3 addition to MCS + C samples. Higher hardness, compressive strength, and wear resistance was noted for W addition than WO3 to MCS+C samples.

scholarly journals Mechanical Properties of Heat-treated Medium Carbon Steel in Renewable and Biodegradable Oil

2019 ◽  
Vol 35 ◽  
pp. 229-235 ◽  
Author(s):  
Oluwagbenga T. Johnson ◽  
Enoch N. Ogunmuyiwa ◽  
Albert U. Ude ◽  
Norman Gwangwava ◽  
Richard Addo-Tenkorang
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Heat Treated
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