Network Carbide Inheritance during Heat Treatment Process of Large Shield Machine Bearing Steel GCr15SiMn

2015 ◽  
Vol 817 ◽  
pp. 115-120 ◽  
Author(s):  
Dan Zhang ◽  
Le Yu Zhou ◽  
Chao Lei Zhang ◽  
Chao Huang ◽  
Min Zhao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Bearing Steel ◽  
Treatment Temperature ◽  
Heat Treatment Process ◽  
Soaking Time ◽  
Hot Rolled ◽  
Chinese Standard ◽  
Shield Machine ◽  
Quenching And Tempering

Network carbide inheritance during heat treatment process of large shield machine bearing steel GCr15SiMn was investigated by heat treatment experiments and quantitative metallographic. Samples with the proeutectoid cementite network thickness in the range of 0.19~0.54 μm were obtained by changing austenitizing temperature and soaking time of pearlite transformation. The results show that the network in hot rolled bar can be improved when the pre-heat treatment temperature is 950 °C. When the network thickness is above 0.40 μm, the undissolved cementite networks present in microstructures after quenching and tempering. In a Chinese standard, the network grades are 1.5 and 3.0 degree when the networks thickness are 0.40 μm and 0.54 μm, respectively. The critical network thickness that can be eliminated by heat treatment is 0.29 μm.

Optimization for Heat Treatment Process of Supercritical Material F92Steel

2011 ◽  
Vol 142 ◽  
pp. 95-98
Author(s):  
Jian Sheng Ding ◽  
Lin Xun Liu ◽  
Jin Chun Feng
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Temperature ◽  
Treatment Process ◽  
Rupture Strength ◽  
Lath Martensite ◽  
Precipitation Strengthening ◽  
Heat Treatment Process ◽  
Fully Integrated ◽  
Quenching And Tempering

The supercritical material F92 steel is regarded as the research object, and the influence law of heat treatment process on its tissue and properties is analyzed. The results show that when the temperature of heat treatment quenching and tempering is too low, a large number of alloying elements cannot be fully integrated into the austenite, and the optimal obdurability of F92 steel is still not fully exploited; while too high temperature of heat treatment quenching and tempering will weaken the strength, plasticity and toughness. When F92 steel is processed by heating quenching at 1050 °C and tempering at 680 °C, its tissue is the smaller tempered lath martensite. The carbide is precipitated, generating precipitation strengthening, which gives it a high rupture strength and toughness. F92 steel is with high mechanical properties when heating quenched at 1050 °C and tempered 680 °C.

High Heat Treatment Analysis on Ba 0.6Sr 0.4TiO3 Thin Films

2014 ◽  
Vol 893 ◽  
pp. 550-553
Author(s):  
Vithyacharan Retnasamy ◽  
Zaliman Sauli ◽  
They Yee Chin ◽  
Loh Sek Nee
Keyword(s):  
Heat Treatment ◽  
Barium Strontium Titanate ◽  
Treatment Process ◽  
Sol Gel ◽  
High Heat ◽  
Treatment Temperature ◽  
Heat Treatment Process ◽  
Barium Strontium ◽  
Treatment Analysis ◽  
High Heat Treatment Temperature

Barium strontium titanate becomes famous among the microelectronic field due to its dielectric properties. Sol-gel method was used to prepare the Ba0.6Sr0.4TiO3and was deposited on SiO2substrate. The temperatures used in the heat treatment process were high temperature, 650°C. For high heat treatment temperature, the process was carried in 2 different times which were 15 min and 60min.The effect of the different temperature and time in the heat treatment process were analysed by using XRD. 650°C for 15 min and 60min, there are clearer peaks observed and the intensity of the 110 peak was sharper.

scholarly journals Synthesis and Characterization of High-Pure Nanocrystalline Forsterite and its Potential for Soft Tissue Applications

2011 ◽  
Vol 20 (2) ◽  
pp. 096369351102000
Author(s):  
Amir Hossein Razavi Kamran ◽  
Fathollah Moztarzadeh ◽  
Masoud Mozafari
Keyword(s):  
Heat Treatment ◽  
Tissue Engineering ◽  
Soft Tissue ◽  
Treatment Process ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Second Phase ◽  
Heat Treatment Process ◽  
Biological Studies ◽  
Soft Tissue Engineering

This research reports the successful synthesis and formation of nanocrystalline forsterite (Mg2SiO4) powder by sol-gel method as a second phase for using in soft tissue engineering nanocomposite scaffolds. As high-pure and nanostructured forsterite is expected to have better biocompatibility and bioactivity, heat-treatment process was done on the synthesized nanopowder to obtain high-pure nanocrystalline forsterite. However, during the synthesis of forsterite, it is very difficult to avoid the formation of MgSiO3 (enstatite) and MgO (periclase). Moreover, increasing of the treatment temperature resulted in the improvement of the purity of the sample and the formation of single-phase forsterite. The TEM micrograph of the synthesized forsterite after the final heat-treatment process indicated that the particles were nearly elliptical shaped morphology and the size was in the range of 10 to 20 nm. This research also demonstrated that the pure forsterite did not show any signs of toxicity after 48 h with fibroblast cells and the cytotoxic scale was measured as zero. In addition, the combined results of the microstructural and biological studies suggested that this material exhibit good potential and biocompatibility for soft tissue engineering applications.

The Effect of FGD Gypsum Heat Treatment Process on Properties of Cement

2013 ◽  
Vol 422 ◽  
pp. 46-50
Author(s):  
Zhi Yong Yang ◽  
Song Zhao ◽  
Jun Hu ◽  
Zeng Chan Lu
Keyword(s):  
Heat Treatment ◽  
Water Consumption ◽  
Flue Gas ◽  
Treatment Process ◽  
Setting Time ◽  
Treatment Temperature ◽  
Strength Development ◽  
Heat Treatment Process ◽  
Fgd Gypsum ◽  
Treatment Processes

To clarify the utilization of flue gas desulphurization (FGD) gypsum as the retarder of cementbased materials,the effect of the properties of the slag cement with different tempemtuIe treatment of FGD gypsum was studied. The results reveal that in the case of adding the same amount, the setting time of cement shortened with the increasing of heat treatment temperature of FGD gypsum. The influence of different heat treatment processes on the strength of cements was not obvious and the strength development was good. The water consumption of normal consistency for cements changed slightly. Stability was qualified.

Effects of Different Heat Treatments on Transformation of Residual Austenite in Bearing Steel

2014 ◽  
Vol 670-671 ◽  
pp. 56-60
Author(s):  
H.S. Liu ◽  
M.H. Wang ◽  
X.Y. Ge ◽  
H.S. Luo
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Treatment Process ◽  
Cryogenic Treatment ◽  
Residual Austenite ◽  
Bearing Steel ◽  
Heat Treatment Process ◽  
Austenite Content ◽  
Quenching Process ◽  
Thermal Stability Of

The effect of heat treatment on transformation of residual austenite in bearing steel is studied, by adding the cryogenic treatment into the normal heat treatment process. The results indicate that the residual austenite content is decreased and the hardness is improved obviously, when putting the cryogenic treatment at -70°C or lower directly behind the quenching process. While when the tempering is added between quench and cryogenic treatment, the temperature of cryogenic treatment must be much lower than -70°C to offset the thermal stability of residual austenite, which is given by tempering.

Investigation of Phase Composition and Microstructure of the B4C/BN Nanocomposite Powders Fabricated by Chemical Reaction and Heat Treatment Process

2011 ◽  
Vol 335-336 ◽  
pp. 195-198 ◽  
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Chemical Reaction ◽  
Treatment Process ◽  
Treatment Temperature ◽  
Heat Treatment Process ◽  
Composite Powders ◽  
Heat Treated ◽  
Coated Layer ◽  
Nanocomposite Powders

The B4C/BN nanocomposite powders were fabricated by chemical reaction and heat treatment process in this research. The starting powders was composed of B4C powders, H3BO3and CO(NH2)2. The mixture powders were reacted at 550°C for 15h and heat treated at 850°C for 6h. So the B4C/BN nanocomposite powders were prepared by above process. In this research, the B4C/BN nanocomposite powders were heat treated at 850°C, 1300°C, 1500°C, 1750°C. The phase composition and microstructure of the B4C/BN nanocomposite powders fabricated by heat treatment at high temperature were investigated by XRD and TEM. The XRD patterns results showed that there existed the B4C phase and amorphous BN phase after chemical reaction at 550°C and heat treatment at 850°C. Then the amorphous BN phase gradually transformed into the hexagonal BN (h-BN) phase with the increase of heat treatment temperature from 1300°C to 1750°C. The amorphous BN phase completely transformed into the h-BN phase after the hot-pressing process at 1850°C. The IR spectrum results showed that there existed the B4C phase and BN phase in the produced composite powders and sintered bulks. The microstructure of the synthesized B4C/BN composite powders showed that the B4C particles were surrounded with the amorphous BN coated layer after the heat treatment at 850°C, then the amorphous BN coated layer gradually transformed into the nano-sized h-BN particles with the increase of heat treatment temperature. So the B4C/BN nanocomposite powders were fabricated by chemical reaction and heat treatment process.

Optimization of Heat Treatment Process of ZE41A Magnesium Alloy Using Grey- Based Taguchi Method

2008 ◽  
Vol 3 (2) ◽  
pp. 63-69
Author(s):  
M. Sivapragash ◽  
◽  
V. Sateeshkumar ◽  
P.R. Lakshminarayanan ◽  
R. Karthikeyan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnesium Alloy ◽  
Taguchi Method ◽  
Treatment Process ◽  
Heat Treatment Process
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