The Research on Process of Deep Cryogenic Treatment for W4Mo3Cr4VSi HSS Drill

2010 ◽  
Vol 97-101 ◽  
pp. 457-460 ◽  
Author(s):  
Hong Juan Yan ◽  
Hong Hai Xu ◽  
Ying Liu
Keyword(s):  
Orthogonal Experiment ◽  
Cryogenic Treatment ◽  
Deep Cryogenic Treatment ◽  
Soaking Time ◽  
Experiment Method ◽  
Before And After ◽  
Orthogonal Experiment Method ◽  
Enhance Wear Resistance ◽  
Carbide Particles ◽  
Soaking Temperature

The Deep Cryogenic Treatment(DCT) process of W4Mo3Cr4VSi HSS was studied by orthogonal experiment method. The paper analysed the effect of various DCT process parameters on mechanical properties and observed microstructure before and after DCT treatment by the SEM. The results show that the effect of soaking temperature on the properties of drill is the first factor, the soaking time is second and the cooling rate is third. DCT enhances the transformation of austenite to martensite, and distributable carbide particles are precipitated from martensite. Therefore DCT increase hardness and enhance wear resistance of twist drill.

Experimental Research on Deep Cryogenic Treatment Process of YT30 Cemented Carbide Inserts

2010 ◽  
Vol 139-141 ◽  
pp. 702-705 ◽  
Author(s):  
Hong Juan Yan ◽  
Hong Hai Xu ◽  
Xin Min Li
Keyword(s):  
Orthogonal Experiment ◽  
Cryogenic Treatment ◽  
Cemented Carbide ◽  
Deep Cryogenic Treatment ◽  
Tempering Temperature ◽  
Before And After ◽  
Orthogonal Experiment Method ◽  
Enhance Wear Resistance ◽  
Carbide Inserts ◽  
Cemented Carbide Inserts

Deep Cryogenic treatment (DCT) is a one time permanent process, carried out in such a way that the material is slowly cooled down to the cryogenic temperature, after which it is held at that temperature for a specified period of time and is heated back to room temperature at slow rate followed by low temperature tempering. In this study, the orthogonal experiment method was used to study the DCT process of YT30 cemented carbide inserts. The primary relation of the different factors of DCT was analyzed. TH300 sclerometer was used to measure the hardness of inserts. The microscopes were used to observe the wearing profiles of inserts and microstructures before and after DCT. The orthogonal experiment results show that the effect of soaking temperature on the properties of inserts is the first factor, the soaking time is second one, the cooling rate is third one, and the last one is the tempering temperature. DCT improves the multi-type martensite transformation of Co. Therefore DCT increases hardness and enhance wear resistance of the cemented carbide inserts.

scholarly journals A Review Article on Various Phytochemicals and Different Medicinal Activities of Haritaki.

2020 ◽  
Vol 5 (6) ◽  
pp. 1445-1447
Author(s):  
M. Franklin ◽  
P. Perumal ◽  
P. Keerthi Vasan
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Cryogenic Treatment ◽  
Case Hardening ◽  
Heat Treatment Process ◽  
Deep Cryogenic Treatment ◽  
Entire Cross Section ◽  
Characterization Study ◽  
Before And After ◽  
Soaking Temperature

Heat treatment process is a resultant process to improve the mechanical and metallurgical properties of the material. Deep cryogenic treatment is not an alternative process to the heat treatment process it is a complimentary process to the heat treatment and it affects the entire cross section of the material. Deep cryogenic treatment is a heat treatment process where the material is subjected to comparatively extreme low temperature condition in order to enhance the mechanical and metallurgical behaviors of the material. Low alloyed case hardening steels used for manufacturing of parts which required to withstand high operating condition such as axle drives, gears & shafts. In this proposed work 20MnCr5 steel has been subjected to Deep Cryogenic Treatment at different soaking temperature and period. A comparative characterization study has to be conducted, before and after the cryogenic treatment, to investigate the behavior of materials.

Influence of Cryogenic Treatment on Grinding Residual Stress of WC-Co Cemented Carbides

2012 ◽  
Vol 538-541 ◽  
pp. 1746-1750 ◽  
Author(s):  
Yi Gao Yuan ◽  
Cheng Hui Xu
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Cooling Rate ◽  
Cryogenic Treatment ◽  
Residual Surface Stress ◽  
Soaking Time ◽  
Fine Grained ◽  
Before And After ◽  
Warming Rate ◽  
Soaking Temperature

The changes in residual surface stress state significantly affect the mechanical behaviour of the materials. In this paper, the effect of cryogenic treatment on grinding residual stress of ultra-fine grained WC-Co hardmetals has been investigated by measuring the residual stress of ground carbide surfaces before and after cryogenic treatment. The results show that the cryogenic treatment can relieve the residual stresses of ground carbide surfaces. Relaxation degree of residual stresses is highly dependent on the process parameters of cryogenic treatment, such as soaking temperature, cooling rate and warming rate. The relaxation rate of residual stresses decreases with the decreasing of soaking temperature, warming rate or increasing cooling rate, and does not change obviously with the soaking time.

Natural Ventilation Design and Optimization of Large-Scale Industrial Workshop

2014 ◽  
Vol 1065-1069 ◽  
pp. 2137-2140
Author(s):  
Xiao Hu Yang ◽  
Yan Long ◽  
Ling Zhao Meng ◽  
Yu Hui Jin
Keyword(s):  
Large Scale ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
Orthogonal Experiment ◽  
Structure Design ◽  
Iron And Steel ◽  
Design And Optimization ◽  
Experiment Method ◽  
Orthogonal Experiment Method ◽  
Computational Fluid Dynamics Cfd

In this paper, we used orthogonal experiment method and Computational Fluid Dynamics (CFD) technology to simulate the thermal environment of the iron and steel workshop. By comparing and analyzing the temperature distribution and air flow of workshops with different window structures, we obtained an optimization of natural ventilation design for industrial workshop. The research results can be used for the structure design or reformation of industrial workshops as reference.

Preparation and Characterization of KGM/CaCO3 Composite Films

2012 ◽  
Vol 724 ◽  
pp. 159-162
Author(s):  
Yan Chen ◽  
Hong Ping Zhang ◽  
Xiao Yan Lin ◽  
Ming Qi Chen ◽  
Yong Man Jiang
Keyword(s):  
Calcium Carbonate ◽  
Zeta Potential ◽  
Orthogonal Experiment ◽  
Composite Films ◽  
Processing Parameters ◽  
Laser Diffraction ◽  
Particle Size Analyzer ◽  
Experiment Method ◽  
Orthogonal Experiment Method

The influences of processing parameters on the tensile strength (TS) of KGM/CaCO3composite films (KCaCF) were investigated through orthogonal experiment method. Calcium carbonate and KCaCF were characterized, respectively, by XRD, laser diffraction particle size analyzer, zeta potential analyzer and SEM. The results showed that micron-sized calcite CaCO3crystals with-16.4 mv of Zeta potential were synthesized. Calcium carbonate dispersion was blended with KGM to fabricate KCaCF. The mass of CaCO3, KGM and swelling time affected TS of composite films differently, but didnt reach the significant level (p>0.05). The optimal preparation process for KCaCF is that 5.0% (wt) of KGM powder is added into the dispersion with 2.0% (wt) of CaCO3, swelling for 1.0 hour at 50 °C and pH 8.0 and then poured onto plate and dried at 50 °C for 15 h.

Design and Experimental Study of the Multi-Function Corn Peeling Machine with Analysis of Segmented Metal Construction Materials

2012 ◽  
Vol 600 ◽  
pp. 144-147
Author(s):  
Chun Hua Zhao ◽  
Tao Zhao ◽  
Bao Long Hu
Keyword(s):  
Experimental Study ◽  
Tilt Angle ◽  
Orthogonal Experiment ◽  
Construction Materials ◽  
Optimal Combination ◽  
Metal Construction ◽  
Experiment Method ◽  
Shaped Roller ◽  
Orthogonal Experiment Method ◽  
Main Material

Peeling roller is an important working part of multi-function corn peeling machine which can stripping the skin of eaten fresh corn, forage corn and seeding corn. The main material of peeling roller was analysed in this paper, The orthogonal experiment method was used to study the effect of peeling roller’s shape, speed and tilt angle on the corn peeling machine’s performance. The results showed that the material and type of peeling roller has the most significant impact on it. The optimal combination of three factors was A2B3C1: “person shaped” roller-type, 550r/min roller’s speed and 10°peeling angle.

Microstructure and Properties of MAO Coatings for AZ91D Magnesium Alloy in Varies Work Mode

2013 ◽  
Vol 747-748 ◽  
pp. 178-183 ◽  
Author(s):  
Xue Jun Cui ◽  
Xiu Zhou Lin ◽  
Chun Hai Liu ◽  
Rui Song Yang ◽  
Ming Tian Li
Keyword(s):  
Magnesium Alloy ◽  
Orthogonal Experiment ◽  
Constant Current ◽  
Optimum Process ◽  
Az91d Magnesium Alloy ◽  
Experiment Method ◽  
Micro Arc Oxidation ◽  
Orthogonal Experiment Method ◽  
Power Mode

Micro arc oxidation coatings were prepared on AZ91D magnesium alloy in order to evaluate the role of electrical parameters under different work mode. Taking HV hardness and pit corrosion time as investigation index, the optimum process parameters were obtained through orthogonal experiment method. The morphology of coating was observed by scanning electron microscopy (SEM). The results showed that the coatings with dense and few micro pores can be obtained under constant current and power mode, and this kind coatings are of good corrosion resistance and have HV micro-hardness compared with those under constant voltage mode.

Internal Friction Study of the Influence of Deep Cryogenic Treatment on the Microstructure of a Bainitic Steel

2012 ◽  
Vol 184 ◽  
pp. 239-244
Author(s):  
Na Min ◽  
Tian Yu Ji ◽  
Li Juan Zhu ◽  
Xiao Chun Wu ◽  
Hong Bin Wang
Keyword(s):  
Internal Friction ◽  
Cryogenic Temperature ◽  
Cryogenic Treatment ◽  
Cryogenic Cooling ◽  
Bainitic Steel ◽  
Deep Cryogenic Treatment ◽  
Soaking Time ◽  
Transmission Electron ◽  
Dislocation Pinning ◽  
Friction Study

The influence of deep cryogenic treatment (DCT) on the microstructure of a bainitic steel is investigated by means of internal friction and transmission electron microscopy (TEM). Two relaxation peaks (Pc1and Pc2) are observed during cooling and one relaxation peak (Ph) during heating from 100 to 320K. Peak Pc1may be related to dislocation pinning. Peak Phis attributed to dislocation-carbon atoms interaction. The decreasing of peak Phafter cycles deep cryogenic cooling indicates that soaking time under the deep cryogenic temperature is not contributed to the precipitation of carbides, while the cycles cryogenic treatment lead to more fine carbides precipitation.

Sign in / Sign up

Export Citation Format

Share Document