The Effect of Grain Size on Cutting Force in End Milling of Inconel 718C

2010 ◽  
Vol 654-656 ◽  
pp. 484-487
Author(s):  
Zhi Long Zhao ◽  
Chang Hui Ai ◽  
Lin Liu
Keyword(s):  
Grain Size ◽  
Cutting Force ◽  
Cutting Forces ◽  
Polynomial Regression ◽  
End Milling ◽  
Base Alloy ◽  
Nickel Base Superalloy ◽  
Wet Condition ◽  
Nickel Base ◽  
Base Superalloy

Inconel 718C is a nickel-base alloy that is difficult to machine. This paper presents a study of the influence of grain size in as-cast workpieces on cutting forces of Inconel 718C. The end milling tests were performed to understand the effect of various grain structures on machinability of nickel-base superalloy under wet condition using carbide insert. The collected data of cutting forces were analyzed using polynomial regression methods. The results show that grain refining of Inconel 718C can effectively decrease cutting force and improve the machinability of nickel-base superalloy.

scholarly journals Grain Refinement of a Powder Nickel-Base Superalloy Using Hot Deformation and Slow-Cooling

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1978 ◽  
Author(s):  
Xianqiang Fan ◽  
Zhipeng Guo ◽  
Xiaofeng Wang ◽  
Jie Yang ◽  
Jinwen Zou
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Hot Deformation ◽  
Nickel Base Superalloy ◽  
Polycrystalline Nickel ◽  
Slow Cooling ◽  
Homogeneous Microstructure ◽  
Average Grain Size ◽  
Nickel Base ◽  
Base Superalloy

A pre-hot-deformation process was applied for a polycrystalline nickel-base superalloy to active deformation twins and dislocations, and subsequent slow cooling treatment was used to achieve grain refinement and microstructure homogenization. The microstructural evolution of the alloy was investigated, and the corresponding underlying mechanism was discussed. It was found that twinning mainly occurred in large grains during pre-hot-deformation owing to the stress concentration surrounding the large grains. High density dislocations were found in large grains, and the dislocation density increased approaching the grain boundary. The average grain size was refined from 30 μm to 13 μm after slow cooling with a standard deviation of grain size decreasing from 10.8 to 2.8, indicating a homogeneous microstructure. The grain refinement and microstructure homogenization during cooling process could be achieved via (i) static recrystallization (SRX), (ii) interaction of twin tips and γ’ precipitates, and (iii) grain coarsening hindered by γ’ precipitates in grain boundaries.

Coherent Interface Contrast in a Nickel Base Alloy

1967 ◽  
Vol 25 ◽  
pp. 308-309
Author(s):  
J. M. Oblak ◽  
B. H. Kear
Keyword(s):  
Small Difference ◽  
Base Alloy ◽  
Lattice Parameter ◽  
Tetragonal Distortion ◽  
Nickel Base Superalloy ◽  
Nickel Base Alloy ◽  
Fringe Contrast ◽  
Coherent Interface ◽  
Nickel Base ◽  
Base Superalloy

During an investigation of recrystallization in the γ′ precipitation hardened nickel-base superalloy Udimet 700 many examples were found of fringe contrast at coherent matrix-γ′ interfaces. The properties of the fringes are those characteristic of so-called “δ-fringes”, as discussed by Gevers et al. A similar phenomenon has been observed in Ni-6.71 wt. % Al, and related to the formation of δ fringes by a tetragonal distortion of the γ matrix at the γ-γ′ interface. The interface fringes in Udimet 700 show surprisingly pronounced contrast despite the small difference in lattice parameter between γ and γ′ (<0.1% vs 0.5% in binary Ni-Al).

Experimental Study on Cutting Force in Machining Nickel Base Superalloy

2010 ◽  
Vol 455 ◽  
pp. 379-382
Author(s):  
X.Y. Wang ◽  
S.Q. Pang ◽  
Q.X. Yu
Keyword(s):  
Cutting Force ◽  
Elevated Temperatures ◽  
High Strength ◽  
Cutting Parameters ◽  
Advanced Materials ◽  
Nickel Base Superalloy ◽  
Nickel Based Superalloy ◽  
Actual Production ◽  
Nickel Base ◽  
Base Superalloy

Studies on cutting force lead an extremely important guiding significance in the actual producing. Nickel base superalloy is widely in the manufacture of components for some important industrial areas, because of their ability to retain high-strength at elevated temperatures. It possesses excellent performance as a class of advanced materials. Because of its very poor machinability, the study on cutting force in machining nickel-based superalloy in the actual production or scientific research is relatively less. In this paper, Author aim at two kinds of typical difficult-to-machining materials nickel base superalloy (GH4169, K24). Contrasting with other typical materials ,such as 45# steel and high strength steel 35CrMnSi，study the law of cutting force effected by cutting parameters under the conditions of turning . Intuitive analysis of cutting force changes with the cutting parameters, as well as these characteristics on three-axis force of each type of material, that is to improve its processability and to provide guidance to actual production has a positive significance.

scholarly journals Microstructural Modeling During Multi-Pass Rolling of a Nickel-Base Superalloy

2009 ◽  
Author(s):  
Kannan Subramanian ◽  
Harish P. Cherukuri
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Strain Rate ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Process Variables ◽  
Shape Rolling ◽  
Microstructural Modeling ◽  
Nickel Base ◽  
Base Superalloy

Superalloys are metallic alloys used for high temperature applications such as encountered in the aircraft industry and where resistance to deformation is a primary requirement. Alloy 718 is one such Nickel-base superalloy that resists deformation at elevated temperatures and is therefore difficult to hot work. One of the major hotworking operations is multi-pass shape rolling in which Alloy 718 undergoes multiple deformations in several passes along with reheating between passes. For a given composition of alloy, the high temperature flow stress is influenced to a large extent by the grain size of the microstructure. In the case of shape rolling in which the cross section changes from circular to oval in alternate passes, the correct working forces, which relate to gauge and shape control as well as to power requirements, can be estimated accurately only if the microstructure relevant to the specific pass of rolling is known. In addition, the microstructure present at the end of the rolling and cooling operations controls the product properties. Control of grain size is an increasingly important characteristic in hotworking. The narrow temperature range (980°C and 1120°C [1]) for hotworking of Alloy 718 makes the grain size control more difficult. During hotworking, Alloy 718 undergoes microscopic and mesoscopic events such as dynamic recrystallization (DRX), metadynamic recrystallization (MDRX) and static grain growth (SGG) depending on the temperature, strain rate and retained strain. Modeling these microstructural events is important in designing the rolling process. Due to the tremendous amount of time, cost and effort associated with experiments and industrial trials, numerical methods are resorted to because of the complexity of the variables involved in multi-pass rolling. One such popular numerical technique, finite element (FE) method can predict process variables such as strain, strain rate and temperature for the deformation process. In general, microstructural modeling relates these process variables to microstructural evolution. During microstructural modeling, constitutive equations describing the microstructural evolutions are developed using experiments, which can then be readily implemented in an FE package capable of modeling rolling processes.

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