scholarly journals DISCONTINUOUS DRILLING OF INCONEL 718

2021 ◽  
Vol 2021 (3) ◽  
pp. 4569-4575
Author(s):  
T. Wolf ◽  
◽  
I. Iovkov ◽  
D. Biermann ◽  
◽  
...  
Keyword(s):  
High Temperature ◽  
Process Design ◽  
Inconel 718 ◽  
Thermal Load ◽  
Machining Process ◽  
Experimental Investigations ◽  
High Temperature Strength ◽  
Drilling Process ◽  
Nickel Base ◽  
Process Strategy

Inconel 718 as one of the most common nickel-base alloys is mainly characterized by its high-temperature strength. Thus, in particular drilling is subject to high tool wear due to high thermomechanical loads on the cutting edges. To reduce those effects an alternative process design of discontinuous drilling was developed which contains a periodical interruption of the machining process with the aim of a targeted wetting and cooling of the tool at regular intervals. Thus, a significant reduction of the thermal load on the tool should provide a benefit to the drilling process and extend the tool life. Numerical and experimental investigations were used to analyze the introduced process strategy modification.

scholarly journals Influence of a Discontinuous Process Strategy on Microstructure and Microhardness in Drilling Inconel 718

2021 ◽  
Vol 5 (2) ◽  
pp. 43
Author(s):  
Tobias Wolf ◽  
Ivan Iovkov ◽  
Dirk Biermann
Keyword(s):  
Surface Integrity ◽  
Chip Formation ◽  
Inconel 718 ◽  
Thermal Load ◽  
High Temperature Strength ◽  
Good Oxidation Resistance ◽  
Cooling Lubricant ◽  
Nickel Base ◽  
A Minor ◽  
Process Strategy

Nickel-base alloys are proven materials in the fields of the aerospace and oil industry, which is due to their characteristic material properties of high temperature strength, high toughness and good oxidation resistance. These properties are beneficial to applications in technical components in general. However, they also represent challenges for machining. Especially while drilling Inconel 718, high temperatures occur in the chip-formation zone that implicate high thermal load in the material and thus, influence the surface integrity, for example, by causing white layers. Hence, the development of strategies to improve the ability to supply cutting edges with cooling lubricant is becoming increasingly important. In this context, an alternative process design, the discontinuous drilling, takes place, characterized by a periodic interruption of feed motion and thus, chip formation. A minor retraction movement from the contact zone enables the cooling lubricant to reach the cutting edges and to reduce their thermal load. In comparison to the conventional process of drilling Inconel 718, the effects of discontinuous drilling with varying numbers of interruptions on the resulting surface integrity and further parameters of drilling qualities are analyzed. Thereby, the prevention of process-related phase transformations due to thermal impact was discovered when a discontinuous drilling strategy was implemented.

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

UNITEMP HX

Alloy Digest ◽  
1964 ◽  
Vol 13 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Base Material ◽  
Heat Treating ◽  
Operating Conditions ◽  
High Temperature Strength ◽  
Temperature Performance ◽  
Nickel Base

Abstract Unitemp-HX is a nickel-base material recommended for high temperature applications. It has outstanding oxidation resistance at high temperatures under most operating conditions, and good high-temperature strength. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-91. Producer or source: Universal Cyclops Steel Corporation.

Fibrous composites with high melting-point matrices

1970 ◽  
Vol 319 (1536) ◽  
pp. 33-44 ◽  
Keyword(s):  
High Temperature ◽  
Epoxy Resins ◽  
Base Alloy ◽  
High Temperature Strength ◽  
High Melting Point ◽  
Temperature Capability ◽  
Strength And Stiffness ◽  
Nickel Base ◽  
Fibre Matrix ◽  
Selection Of

It is now well established that the strength and stiffness of materials such as epoxy resins and aluminium can be increased by the incorporation of suitable fibres. However, relatively little effort has been made to improve similarly the high temperature strength of materials intended for service above ca . 800°C. This paper is introduced with a general examination of fibre/matrix systems that offer improved high temperature capability over current materials, with reference to gas turbine blade applications. The importance of properties and characteristics that influence the selection of suitable fibre and matrix combinations, for example, density, strength, oxidation resistance and compatibility, are discussed. Experi­mental work on the strength of potentially useful fibres such as refractory metal and alumina filaments, their incorporation into nickel-base alloy matrices using vacuum-casting techniques, and the evaluation of composites are described. In terms of the measured properties and of strength predictions based on fibre and matrix data, the merits and limitations of composites relative to well-developed alloys strengthened by precipitation mechanisms are considered.

Analysis of Cutting Technologies for Lightweight Frame Components

2006 ◽  
Vol 10 ◽  
pp. 121-132 ◽  
Author(s):  
Klaus Weinert ◽  
Sven Grünert ◽  
Michael Kersting
Keyword(s):  
Finite Element ◽  
Metal Cutting ◽  
Thermal Stresses ◽  
Machining Process ◽  
Frame Structure ◽  
Experimental Investigations ◽  
Promising Alternative ◽  
Thin Walled ◽  
Process Strategy ◽  
Conventional Drilling

Most technical components applied in industrial practice are subjected to metal cutting operations during their production process. However, this leads to undesirable thermal and mechanical loads affecting the machined workpiece, which can result in an impairment of its serviceability. Due to their small wall thickness lightweight hollow profiles are highly susceptible to the inevitable machining loads and thermal stresses during drilling processes. For the virtual optimization of the machining process and in order to ensure a suitable process strategy, a finite element simulation of cutting operations for thin-walled light metal profiles is conducted. Due to the flexibility within creating drill holes of different diameters without tool changes circular milling represents a promising alternative to the application of conventional drilling tools for variable process strategies to handle batch sizes down to one piece efficiently. Hence, this article gives an insight into the investigations regarding the modeling concepts of the mechanical and thermal loads induced into the thin-walled lightweight frame structure during the circular milling process. Furthermore, process reliability aspects as well as the correlation of the calculated and the measured results will be discussed on the basis of experimental investigations. Finally, this article compares Finite Element Analysis aspects of circular milling processes with conventional drilling processes.

scholarly journals Phase transformations in nickel base superalloy INCONEL 718 during cyclic loading at high temperature

2017 ◽  
Vol 15 ◽  
pp. 15-18 ◽  
Author(s):  
Michal Jambor ◽  
Otakar Bokůvka ◽  
František Nový ◽  
Libor Trško ◽  
Juraj Belan
Keyword(s):  
High Temperature ◽  
Cyclic Loading ◽  
Phase Transformations ◽  
Inconel 718 ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Base Superalloy

scholarly journals Experimental investigations and finite element analysis of milling of Inconel 718 alloy

2021 ◽  
Vol 12 ◽  
pp. 21
Author(s):  
Akhil C. Kuriakose ◽  
Raman Balakrishnan ◽  
Harsh Vardhan ◽  
Krishnaraju Srinivasaraju Vijay Sekar
Keyword(s):  
Inconel 718 ◽  
End Milling ◽  
Chip Morphology ◽  
Milling Process ◽  
Experimental Investigations ◽  
High Temperature Strength ◽  
Inconel 718 Alloy ◽  
Element Analysis ◽  
The Family ◽  
Research Gap

Super-alloys encompass great challenges in machinability. One such alloy of much interest in applications is Inconel 718. Its increased hardness, low thermal diffusivity and high temperature strength make it desirable for applications, at the same time rendering its machining a demanding task. Extensive studies have been performed on machinability of Inconel 718, from the turning process stand-point. However, there is found to be a comparative dearth of work on the milling process. Taking into account the versatility of end-milling within the family of milling processes and the research gap, we found that a parametric optimization (aimed at minimum machining forces) of end-milling would be a meaningful effort. An experiment was conducted to study conditions that would help us achieve the same. In our further quest for optimization, chip morphology studies using SEM occupied a special place. Bearing in mind immense prediction capabilities of computer simulations based on FEA available today, we attempted process replication of the experimental work. The significant cutting forces were chosen as the benchmark factor for this purpose and proper attention was given to validation of the FEM created. Such FEM holds promise of being resourceful to drive up efficiency, with consequent spill-over to the production line.

ALLOY VMS-513

Alloy Digest ◽  
1975 ◽  
Vol 24 (1) ◽  
Keyword(s):  
High Temperature ◽  
Base Alloy ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Operating Conditions ◽  
High Temperature Strength ◽  
Nickel Base Alloy ◽  
Good Resistance ◽  
Temperature Performance ◽  
Nickel Base

Abstract ALLOY VMS-513 is a nickel-base alloy developed to meet the tough operating conditions of gasoline and diesel engines. It combines high-temperature strength with good resistance to corrosion and wear, plus good fatigue strength. It is used in valves for gasoline-fueled industrial engines. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance, corrosion and wear resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-213. Producer or source: Simonds Steel Division, Wallace-Murray Corporation.

Fracture Behavior of Inconel 718 at High Temperature

2011 ◽  
Vol 462-463 ◽  
pp. 1244-1249 ◽  
Author(s):  
Omar Bapokutty ◽  
Zainuddin Sajuri ◽  
Junaidi Syarif ◽  
A.R. Said
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Inconel 718 ◽  
Elevated Temperatures ◽  
Solution Treatment ◽  
Nickel Base Superalloy ◽  
Creep Properties ◽  
Heat Treated ◽  
Significant Difference ◽  
Nickel Base

The effect of heat treatment on tensile and creep properties of nickel-base superalloy, Inconel 718 in room and at high temperature was investigated. Solution treatment was applied on the as-received material at 980oC for 1 hour before water quenched followed by double aging treatments at 720oC and 621oC for 8 hours, respectively and then cooled in air. The tensile strength at elevated temperatures of 550oC and 650oC were slightly deteriorated for heat treated and as-received materials. Beside strength, significant difference was observed in the elongation. The elongation of heat treated samples drastically reduced to 4 to 5% only compared to that of the as received materials which exhibited more than 30% elongation. The significant increased in tensile strength is suspected due to the present of γ’, γ” and δ precipitates which pinned the movement of grain boundary and sliding. However, the present of these precipitates caused the material to become harder and brittle. Moreover, the increase in load from 70% to 90% UTS and in temperature significantly accelerated the creep rate.

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