Synthesis and Processing of Nanograined Fe - (Fe, Mo)6C Composite Powders

1994 ◽  
Vol 351 ◽  
Author(s):  
R. K. Sadangi ◽  
B. H. Kear ◽  
L. E. McCandlish
Keyword(s):  
High Speed ◽  
Volume Fraction ◽  
High Volume ◽  
Processing Parameters ◽  
Precursor Powder ◽  
Water Soluble ◽  
Thermochemical Conversion ◽  
Composite Powders ◽  
Nanostructured Composite ◽  
Spray Conversion

ABSTRACTSpray Conversion Processing was used to synthesize high volume fractions (0.52 - 0.74) of nanograined (Fe, Mo)6C carbide dispersions in iron, starting from water soluble precursors. The essential features of the process are, (1) preparation of a chemically homogeneous precursor powder, and (2) thermochemical conversion of the precursor powder to the desired nanostructured composite powder through controlled gas-solid reactions. The thermodynamic and kinetic features of the gas-solid reactions, and the influence of various processing parameters on the structures developed, are discussed. The powders were consolidated to near theoretical density by pressureless sintering and hot pressing. All the consolidated samples had bicontinuous structures. Compared to M2 high speed tool steels, these high volume fraction carbide strengthened iron alloys display superior hardness values up to 500°C.

scholarly journals Study on the High-Speed Milling Performance of High-Volume Fraction SiCp/Al Composites

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4143
Author(s):  
Youzheng Cui ◽  
Shenrou Gao ◽  
Fengjuan Wang ◽  
Qingming Hu ◽  
Cheng Xu ◽  
...  
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Volume Fraction ◽  
Simulation Analysis ◽  
Cutting Temperature ◽  
High Volume ◽  
Cutting Parameters ◽  
High Volume Fraction ◽  
High Wear Resistance ◽  
Element Analysis

Compared with other materials, high-volume fraction aluminum-based silicon carbide composites (hereinafter referred to as SiCp/Al) have many advantages, including high strength, small change in the expansion coefficient due to temperature, high wear resistance, high corrosion resistance, high fatigue resistance, low density, good dimensional stability, and thermal conductivity. SiCp/Al composites have been widely used in aerospace, ordnance, transportation service, precision instruments, and in many other fields. In this study, the ABAQUS/explicit large-scale finite element analysis platform was used to simulate the milling process of SiCp/Al composites. By changing the parameters of the tool angle, milling depth, and milling speed, the influence of these parameters on the cutting force, cutting temperature, cutting stress, and cutting chips was studied. Optimization of the parameters was based on the above change rules to obtain the best processing combination of parameters. Then, the causes of surface machining defects, such as deep pits, shallow pits, and bulges, were simulated and discussed. Finally, the best cutting parameters obtained through simulation analysis was the tool rake angle γ0 = 5°, tool clearance angle α0 = 5°, corner radius r = 0.4 mm, milling depth ap = 50 mm, and milling speed vc= 300 m/min. The optimal combination of milling parameters provides a theoretical basis for subsequent cutting.

Studies on Cutting Forces of High Volume Fraction SiCp/Al Composites with Ultrasonic Vibration High Speed Milling

2011 ◽  
Vol 295-297 ◽  
pp. 785-788 ◽  
Author(s):  
Dao Hui Xiang ◽  
Guang Xi Yue ◽  
Xin Tao Zhi ◽  
Hai Tao Liu ◽  
Bo Zhao
Keyword(s):  
Cutting Forces ◽  
High Speed ◽  
Volume Fraction ◽  
Cutting Speed ◽  
High Volume ◽  
High Volume Fraction ◽  
Matrix Composites ◽  
Machining Performance ◽  
High Speed Milling ◽  
Hard Cutting

The orthogonal method was used for analyzing the machining performance of high volume fraction SiCp/Al metal matrix composites (SiCp/Al MMCs) during high speed milling and ultrasonic high speed milling in this paper. The influence of cutting speed, feed rate and cutting depth on 3-directional forces were investigated. The results show that the cutting forces are decreased due to the cutting mechanism of SiCp/Al MMCs is changed from brittle cutting to ductile cutting during ultrasonic high speed milling. In addition, the chips exist in forms of C-type chips because of increasing rake angles. Ultrasonic high-speed milling is a more highly effective hard cutting way compared with high speed milling.

Study on Finite Element Simulation of the Influence of Cutting Speed on Chip Formation of SiCpAl Composites in High Speed Milling

2014 ◽  
Vol 800-801 ◽  
pp. 290-295
Author(s):  
Chuang Liu ◽  
Shu Tao Huang ◽  
Ke Ru Jiao ◽  
Li Fu Xu
Keyword(s):  
Finite Element ◽  
Chip Formation ◽  
High Speed ◽  
Volume Fraction ◽  
Cutting Speed ◽  
High Volume ◽  
High Volume Fraction ◽  
High Speed Milling ◽  
Finite Element Software ◽  
High Efficient

Application prospect of the high volume fraction SiCp/Al composites becomes increasingly widespread, the study of cutting mechanism is important for achieving its high efficient and precision machining. In this paper, a three-dimensional beveled simulation model of high volume fraction SiCp/Al composites on high-speed milling is established by finite element software ABAQUS, the constitutive on model material, the tool-chip contact and the chip separation model is elected reasonably.The paper analyzes the effect of cutting speed on the chip formation and the stress distribution of the material. The results shows that: with the increasing of cutting speed, the chip is easily broken, cutting speed have little impact on the maximum stress of the material.

scholarly journals Rotary ultrasonic machining of SiCp/Al composites: An experimental study on cutting force and machinability

2019 ◽  
Vol 11 (12) ◽  
pp. 168781401989832
Author(s):  
Ming Wang ◽  
Wei Zheng ◽  
Ming Zhou ◽  
Qun Zhang
Keyword(s):  
Experimental Study ◽  
Cutting Force ◽  
Volume Fraction ◽  
High Volume ◽  
Processing Parameters ◽  
Grinding Force ◽  
Ultrasonic Machining ◽  
Processing Quality ◽  
Rotary Ultrasonic Machining ◽  
The Cost

To improve the processing quality and reduce the cost of SiCp/Al composites has become a key problem for its application. Rotary ultrasonic machining is highly suitable for machining of SiCp/Al composites with a medium or high volume fraction of reinforced phase, and the processing quality and efficiency could be improved greatly. In this article, the rotary ultrasonic machining experiments were performed for the SiCp/Al composites reinforced with 45% volume fraction, and the effects of processing parameters on the cutting force of face and flank machining were studied. The cutting force values reduce significantly, and the grinding force ratios Fn/ Ft of face and flank machining are 2.843 and 1.336, respectively, which indicate that better machinability can be achieved for SiCp/Al composites using rotary ultrasonic machining.

Synthesis of nanostructured metal (Fe, Al)-C60 composites

2010 ◽  
Vol 1276 ◽  
Author(s):  
I. I. Santana García ◽  
V. Garibay Febles ◽  
H. A. Calderon
Keyword(s):  
Raman Spectroscopy ◽  
Mechanical Milling ◽  
Volume Fraction ◽  
High Volume ◽  
X Ray Diffraction ◽  
Nanostructured Composite ◽  
Plasma Sintering ◽  
Transmission Electron ◽  
Show Evidence ◽  
Spark Plasma

AbstractComposites of M-2.5 mol. % Fullerene C60 composites (where M= Fe or Al) are prepared by mechanical milling and Spark Plasma Sintering (SPS). The SPS technique has been used to consolidate the resulting powders and preserve the massive nanostructure. Results of X-Ray Diffraction and Raman Spectroscopy show that larger milling balls (9.6 mm in diameter) produce transformation of the fullerene phase during mechanical milling. Alternatively smaller milling balls (4.9 mm in diameter) allow retention of the fullerene phase. SEM shows homogeneous powders with different particle sizes depending on milling times. Sintering produces nanostructured composite materials with different reinforcing phases including C60 fullerenes, diamonds and metal carbides. The presence of each phase depends characteristically on the energy input during milling. Transmission Electron Microscopy (TEM) and Raman Spectroscopy show evidence of the spatial distribution and nature of phases. Diamonds and carbides can be identified for the sintered Fe containing composites with a relatively high volume fraction.

Study on Milling Force of High Volume Fraction SiCp/Al Composites with Ultrasonic Longitudinal and Torsional Vibration High Speed Milling

2014 ◽  
Vol 910 ◽  
pp. 114-117 ◽  
Author(s):  
Dao Hui Xiang ◽  
Guang Bin Yang ◽  
Song Liang ◽  
Yan Feng Wang ◽  
Qiang Qin
Keyword(s):  
Torsional Vibration ◽  
High Speed ◽  
Volume Fraction ◽  
Fold Increase ◽  
High Volume ◽  
High Volume Fraction ◽  
Milling Force ◽  
High Speed Milling ◽  
Milling Method ◽  
Milling Forces

High volume fraction SiCp/Al composites were milled in ultrasonic longitudinal and torsional vibration high speed milling and high speed milling in this experiment, study on effects of different milling parameters (milling depth ap, feed engagement fz, the milling speed vz) on milling force. The results shows that in the same cutting parameters ,the three milling force of ultrasonic longitudinal and torsional vibration high speed milling are smaller than that of high speed milling, and milling forces of two milling method increase with the add of the milling depth and feed engagement ,but they aren't fold increase. Milling forces of two milling method decrease with the add of the the minlling speed,and the changes become gently when the the minlling speed run up to 170m/min, with the further increase of the milling speed,ultrasonic vibration high speed milling will translate to high speed milling, this is because the torsional vibration is submerged.

Study on Tool Wear of High Volume Fraction SiCp/Al Composites with Ultrasonic Vibration High Speed Milling

2012 ◽  
Vol 252 ◽  
pp. 198-201 ◽  
Author(s):  
Dao Hui Xiang ◽  
Hai Tao Liu ◽  
Xiao Jiang ◽  
Song Liang ◽  
Guang Bin Yang
Keyword(s):  
Ultrasonic Vibration ◽  
High Speed ◽  
Cutting Tool ◽  
Volume Fraction ◽  
High Volume ◽  
High Volume Fraction ◽  
Milling Tool ◽  
The Relationship ◽  
Milling Tools ◽  
Vibration Milling

Abstract: High volume fraction SiCp/Al composites were milled in ultrasonic longitudinal high frequency vibration milling and conventional milling in this experiment. Meanwhile, the form of wear and wear mechanism of PCD milling tools were investigated. In addition, the relationship between the maximum wear of PCD milling tool and the length of milling were obtained. The results show that it is mainly flank wear of PCD cutting tool under the same milling parameters, which are caused due to hard points wear and thermal and chemical wear. Furthermore, the wear of PCD cutting tool by the ultrasonic vibration milling is smaller than that obtained by the conventional milling.

Synthesis of Fe-ZrO2 Composite Powders by Thermochemical Method

2016 ◽  
Vol 721 ◽  
pp. 285-289 ◽  
Author(s):  
Elizaveta Bobrynina ◽  
Ahmad Alali Alkhalaf ◽  
Aleksey Shamshurin ◽  
Oleg Tolochko ◽  
Veselin Mikhailov
Keyword(s):  
Zirconium Oxide ◽  
Precursor Powder ◽  
Water Soluble ◽  
Homogeneous Distribution ◽  
Volatile Components ◽  
Iron Particles ◽  
Welding Wire ◽  
Composite Powders ◽  
Thermochemical Process ◽  
Thermochemical Method

Nanostructured Fe–ZrO2 composite powders with homogeneous distribution of zirconia were synthesized by thermochemical process. The synthesis procedures are (1) preparation of precursor powder by spray-drying of solution made from water-soluble iron and zirconium nitrates, (2) air heat treatments to evaporate volatile components in the precursor powder and synthesis of nanostructured Fe2O3 +ZrO2, and (3) Fe2O3 reduction by hydrogen into pure Fe. In order to find phase containing Zr the powder was treated with 15% hydrochloric acid to dissolve iron particles. The size of the particles is less than 50 nm. Fe–ZrO2 composite powders can be used as filler for cored welding wire. Shown that particles zirconium oxide well affect the final structure of the weld.

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