To Study the Effect of Microstructures on Machinability of Inconel-718 Superalloy in Micro-Drilling Process

2021 ◽  
Vol 143 (7) ◽  
Author(s):  
Shashi Ranjan Singh ◽  
Jitesh Vasavada ◽  
Rakesh Ganpat Mote ◽  
Sushil Kumar Mishra
Keyword(s):  
Mechanical Properties ◽  
Inconel 718 ◽  
Elevated Temperatures ◽  
Thrust Force ◽  
Drilling Process ◽  
Machined Surface ◽  
Clear Trend ◽  
Thermomechanical Process ◽  
Wide Range ◽  
Micro Drilling

Abstract Nickel-based superalloys have been extensively used in the aerospace industry due to their excellent mechanical properties at elevated temperatures. The mechanical properties of the Inconel-718 majorly depend on its microstructure which can be controlled using thermomechanical treatments. Machining of the heat-treated Inconel-718 component is very difficult due to very high hardness. This paper investigates the relationship between the material microstructure developed through a thermomechanical process and the machinability through micro-drilling of Inconel-718. In this study, a wide range of microstructures with hardness ranging from 179 HV to 461 HV was achieved by different thermomechanical and heat-treatment processes. Flank wear, thrust force, and burr height analysis were carried out to understand the machining behavior after micro-drilling. Electron back scattered diffraction (EBSD) technique was used to characterize the microstructure. No correlation between grain size and thrust force was observed. However, a clear trend between thrust force and hardness was established. It was also observed through misorientation analysis that the machined surface deforms significantly with material hardness.

Mechanical Properties and Dislocation Structure of Single Crystal Cdte Deformed in Compression at 300°C

1976 ◽  
Vol 34 ◽  
pp. 592-593
Author(s):  
Ernest L. Hall ◽  
J. B. Vander Sande
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Dislocation Structure ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Optical Devices ◽  
Semiconductor Compound ◽  
Wide Range ◽  
Sample Orientation

The present paper describes research on the mechanical properties and related dislocation structure of CdTe, a II-VI semiconductor compound with a wide range of uses in electrical and optical devices. At room temperature CdTe exhibits little plasticity and at the same time relatively low strength and hardness. The mechanical behavior of CdTe was examined at elevated temperatures with the goal of understanding plastic flow in this material and eventually improving the room temperature properties. Several samples of single crystal CdTe of identical size and crystallographic orientation were deformed in compression at 300°C to various levels of total strain. A resolved shear stress vs. compressive glide strain curve (Figure la) was derived from the results of the tests and the knowledge of the sample orientation.

Research on Drilling Process of Nickel-Based Super-Alloy

2010 ◽  
Vol 33 ◽  
pp. 373-377
Author(s):  
Jian Wu ◽  
Rong Di Han
Keyword(s):  
Feed Rate ◽  
Empirical Formula ◽  
Inconel 718 ◽  
Thrust Force ◽  
Shear Angle ◽  
Drilling Process ◽  
Deformation Characteristics ◽  
Drilling Speed ◽  
Aisi 1045 ◽  
Super Alloy

Nickel-based super-alloy belongs to difficult-to-machine materials, its machinability is low. To find out the difficulties of drilling nickel-based super-alloy, it is necessary to study the drilling process. The study on the drilling process of nickel-based super-alloy Inconel 718 is discussed from two aspects, drilling deformation and drilling forces distribution. For studying the drilling deformation characteristics and influence laws, the drilling chip specimens are obtained by using self-made drilling quick-stop device. Then, the empirical formula of shear angle is also given. Finally, the drilling forces distribution is studied. Results shows that: drilling deformation decreases when the distance to chisel edge, drilling speed and feed rate increases; drilling deformation of Inconel 718 is larger than AISI 1045; the ratio of torque and thrust force on the lead cutting edge is 29%~33%, 74%~77%, respectively; the torque and thrust force of Inconel 718 is about 1.8~2.3 times than that of AISI 1045.

Microstructure and Mechanical Properties of Silicon Nitride/h-BN Based Machinable Ceramics

2005 ◽  
Vol 287 ◽  
pp. 340-345 ◽  
Author(s):  
Won Seung Cho ◽  
Jae Hyung Lee ◽  
Myeong Woo Cho ◽  
Eun Sang Lee ◽  
Dong Sam Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ceramic Composites ◽  
Drilling Process ◽  
Sintered Compact ◽  
Pull Out ◽  
Indentation Crack ◽  
Micro Drilling ◽  
Crack Paths ◽  
Thrust Forces ◽  
Si3n4 Ceramics

The effects of h-BN content on the microstructure, mechanical properties, and machinability of Si3N4 ceramics were investigated. The relative density of the sintered compact decreased with increasing BN content. The flexural strength also decreased with h-BN content, mainly due to lower Young’s modulus of h-BN compared to Si3N4. With increasing h-BN content, Si3N4/h-BN based ceramic composites revealed enhanced crack resistance (R-curve) behavior. The Vickers indentation crack paths in specimens are sinusoidal due to bridging and pull out of grains during crack propagation. The grain size of ß-Si3N4 slightly decreased with h-BN content. During milling and micro-drilling process, monolithic Si3N4 ceramic could not be machined, due to brittle fracture. However, thrust forces measured for Si3N4/h-BN composites decreased with increasing h-BN content, showing the excellent macro and micro machinabilty.

scholarly journals Modeling Mechanical Properties of 25Cr-20Ni-0.4C Steels over a Wide Range of Temperatures by Neural Networks

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 256
Author(s):  
P. L. Narayana ◽  
Jae H. Kim ◽  
A. K. Maurya ◽  
Chan Hee Park ◽  
Jae-Keun Hong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Neural Networks ◽  
Elevated Temperatures ◽  
Point Of View ◽  
Complex Nature ◽  
Learning Tools ◽  
Ann Model ◽  
Temperature Property ◽  
Effective Response ◽  
Wide Range

From the point of view of designing materials, it is important to study the complex correlational research that involves measuring several variables and assessing the relation among them. Hence, the notion of machine-oriented data modeling is explored. Among various machine-learning tools, artificial neural networks (ANN) have been used as a stimulating tool to solve engineering-related issues. In this study, the ANN model is designed and trained to correlate the complex relations among composition, temperature and mechanical properties of 25Cr-20Ni-0.4C austenitic stainless steel. The developed model was exploited to estimate the composition–property and temperature–property correlations. The ANN predictions are well suitable for experimental results. The model was able to correlate the complex nature among input and output variables. The model was used to investigate the effect of service temperature on the mechanical properties of 25Cr-20Ni-0.4C steels over a wide temperature range. The effective response of the alloying elements on the mechanical properties of ambient as well as elevated temperatures was quantitatively estimated with the help of the index of relative importance (IRI) method. Hence, this handy technique is the best tool to overcome the designing complications and to develop the components having remarkable properties.

Processing and Characterization of Al2O3-YAG Composite

2012 ◽  
Vol 727-728 ◽  
pp. 1334-1339
Author(s):  
E.S. Lima ◽  
Luis Henrique Leme Louro ◽  
José Brant de Campos ◽  
R.R. de Avillez ◽  
Sérgio Neves Monteiro ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Elevated Temperatures ◽  
Eutectic Reaction ◽  
Ceramic Matrix ◽  
Oxide Ceramics ◽  
High Temperature Mechanical Properties ◽  
Wide Range ◽  
Potential Use

Oxide ceramics show better oxidation resistance at high temperatures than other ceramics; however they are more susceptible to plastic deformation at elevated temperatures [. If their high temperature mechanical properties could be improved, they would be expected to open a wide range of applications as structural material [2, 3]. Several studies have revealed [4, 5] the potential use of YAG oxides as reinforcing component oxide in a ceramic matrix. Both YAG and Al2O3 have similar thermal expansion coefficient and they are chemically stable because of their low O2 vapor pressure. In addition, there is no solid state phase transition as the temperature rises, but the eutectic reaction at 1826°C with Al2O3 molar concentration of 81.5% and 18.5% for Y2O3 which enable a fusion processing, turning the Al2O3-YAG composites very attractive. This eutectic reaction is possible in the restrictive composition from 18.5 to 20.5 mol% Y2O3 [6].

Microstructure and Mechanical Properties of Inconel 718 Produced by SLM and Subsequent Heat Treatment

2015 ◽  
Vol 651-653 ◽  
pp. 665-670 ◽  
Author(s):  
Anatoly A. Popovich ◽  
Vadim Sh. Sufiiarov ◽  
Igor A. Polozov ◽  
Evgenii V. Borisov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Selective Laser Melting ◽  
Inconel 718 ◽  
Elevated Temperatures ◽  
Ductile Failure ◽  
Mechanical Tests ◽  
Laser Melting ◽  
Microstructure And Mechanical Properties ◽  
Before And After

The article presents results of selective laser melting of Inconel 718 superalloy. It was studied phase microstructure of the material obtained by selective laser melting and also the material after heat treatment. The phase composition of the initial powder material, the specimens after selective laser melting before and after heat treatment was studied. The effect of heat treatment on microstructure and mechanical properties of the specimens was shown. It was studied the mechanical behavior of the manufactured specimens before and after heat treatment at room and elevated temperatures as well. The results of impact tests and fractography of the specimens are presented. Mechanical tests showed that the specimens after heat treatment have decent mechanical properties comparable to hot-rolled material. Fractography showed that the obtained material is characterized by ductile failure mode with local elements of brittle fracture.

scholarly journals Chip Formation Mechanism of Inconel 718: A Review of Models and Approaches

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Chun Liu ◽  
Min Wan ◽  
Weihong Zhang ◽  
Yun Yang
Keyword(s):  
Formation Mechanism ◽  
Chip Formation ◽  
Inconel 718 ◽  
Cutting Tools ◽  
Iron Alloy ◽  
High Temperature Strength ◽  
Workpiece Material ◽  
Machined Surface ◽  
Wide Range ◽  
Chip Formation Mechanism

AbstractInconel 718, a nickel, chrome and iron alloy, has special advantages, such as high-temperature strength, thermal resistance and corrosion resistance, which facilitate wide usage in the aerospace industry, especially in the hot sections of gas turbine engines. However, machining this alloy is correlated closely with the material’s inherent properties such as excellent combination of strength, hardness and toughness, low thermal conductivity and the tendency to adhere to cutting tools. This nickel alloy also contains inclusions of hard abrasive carbide particles that lead to work-hardening of the workpiece material and thus abrasive wear of the cutting tool. That is, the machining of Inconel 718 is always influenced by high mechanical and thermal loads. This article reviews the chip formation mechanism of Inconel 718. One of the main characteristics in machining of Inconel 718 is that it will produce serrated or segmented chips in a wide range of cutting speeds and feeds. Existing studies show that the chip serration or segmentation by shear localization affects the machined surface integrity, and also contributes to the chip’s evacuation and the automation of machining operations. Thus, research conclusion indicates that the serrated or segmented chip phenomenon is desirable in reducing the level of cutting force, and detailed analysis of models and approaches to understand the chip formation mechanism of Inconel 718 is vital for machining this alloy effectively and efficiently. Therefore, this article presents some summaries on the models and approaches on the chip formation in machining of Inconel 718.

Considerations for Sintering in High Temperature Electronics

2019 ◽  
Vol 2019 (HiTen) ◽  
pp. 000071-000073
Author(s):  
Thomas Krebs
Keyword(s):  
High Temperature ◽  
Elevated Temperatures ◽  
High Reliability ◽  
Extreme Environments ◽  
Hydraulic Systems ◽  
Mechatronic Systems ◽  
Clear Trend ◽  
High Temperature Electronics ◽  
Wide Range ◽  
Bonding Wires

Abstract High temperature electronics are used in a wide range of applications especially in extreme environments. There is a clear trend in aircrafts to have electrical controls mounted closer to the engine [1]. In cars more and more mechanical and hydraulic systems are replaced by electromechanical or mechatronic systems [2]. They are getting closer to high temperature environments like the engine or brakes. To its nature, avionic and automotive applications require predictable, highly reliable systems. Because elevated temperatures will increase the speed of material aging, the combination of high operation temperatures and high reliability is quite challenging. This applies in particular to interconnect materials such as solders or bonding wires.

NIMAG 101

Alloy Digest ◽  
1976 ◽  
Vol 25 (10) ◽  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Low Carbon ◽  
Vacuum Melting ◽  
Good Corrosion Resistance ◽  
Temperature Performance ◽  
Wide Range ◽  
High Degree

Abstract NIMAG 101 combines good mechanical properties with good corrosion resistance. It retains its strength to a high degree at elevated temperatures. Close control of composition is achieved by vacuum melting. This material has a wide range of electrical and electronic applications. Nimag 101 is a low-carbon version of Nimag 100. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-234. Producer or source: Spang Industries Inc..

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