Paper Title:

A FEM Study on Chip Formation in Orthogonal Turning Nickel-Based Superalloy GH80A

Periodical Materials Science Forum (Volumes 575 - 578)
Main Theme Physical and Numerical Simulation of Materials Processing
Edited by Jitai NIU, Zuyan LIU, Cheng JIN and Guangtao Zhou
Pages 1370-1375
DOI 10.4028/www.scientific.net/MSF.575-578.1370
Citation Jun Li Li et al., 2008, Materials Science Forum, 575-578, 1370
Online since April 2008
Authors Jun Li Li, Gang Liu, Dong Jin Zhang, Ming Chen
Keywords Adiabatic Shearing, Experiment, Finite Element Model (FEM), Nickel-Based Superalloy, Periodic Crack, Saw-Tooth Chip, Turning
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The nickel-based superalloy GH80A is a typical difficult-to-cut material. It has been used in a good many kinds of aeronautical key structures because of its high yield stress and anti-fatigue performance at high temperature. But selection of cutting parameters in actual machining process mainly depends on experience and lacks of scientific utterance. In this paper, finite element method (FEM) was introduced to study the chip formation process when machining nickel-based superalloy GH80A. By the way of lagrangian finite element approach and material failure, adiabatic shear band (ASB) and periodic fracture were simulated with the help of former researchers’ studies on the material constitutive relation. Both the mechanism of adiabatic shearing phenomenon at primary shear zone and periodic crack in the free surface were analyzed, chip formations under different cutting parameters were got and compared carefully. The root cause of saw-tooth chip formation under different cutting speeds was discussed.

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