Paper Title:
Optimising the Model of Gas-Jet Quenching of a Carburised Gear
  Abstract

Extensive CFD modelling of cooling using nitrogen jets showed that an array of high velocity gas jets close to its surface could cool the part at a similar speed to oil. The optimum conditions were: an approximately uniform nozzle field with the jets four to eight times their own diameter apart, at a distance from the part to be quenched of a quarter of the diameter of the jets; and a jet velocity of 100 m/s. When these optimised conditions were applied to an idealised gear form, the model suggested that it could be fully hardened if a nitrogen/hydrogen mixture was used. The model was validated by comparison with physical experiments under exactly the same conditions. Unfortunately, although close to the physical results, the model results had some important differences. Part of the difference was explained by the exclusion of radiation losses from the model and part by the use of values for specific heat that were derived from static, rather than dynamic, experiments. When the model was modified to correct these there was closer, but by no means perfect, agreement. The finite element model used at this stage was thought to model the heat transfer accurately, but not the steel. The heat transfer data was therefore applied to a metallurgical model. The results from this model were superior in some respects, particularly regarding the phase changes occurring, although again not perfect, perhaps because of the experimental technique used.

  Info
Periodical
Advanced Materials Research (Volumes 29-30)
Edited by
Deliang Zhang, Kim Pickering, Brian Gabbitas, Peng Cao, Alan Langdon, Rob Torrens and Johan Verbeek
Pages
37-42
DOI
10.4028/www.scientific.net/AMR.29-30.37
Citation
P. Stratton, "Optimising the Model of Gas-Jet Quenching of a Carburised Gear", Advanced Materials Research, Vols. 29-30, pp. 37-42, 2007
Online since
November 2007
Authors
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Sam Son Yoon, Keum Oh Lee, Soon Bok Lee, K.H. Park
Abstract:In this study, we investigated the reliability assessment of exhaust manifold used in thermomechanical condition. Overlay model proposed by...
1203
Authors: Rim Dakhlaoui, Chedly Braham, Andrzej Baczmanski, Sebastian Wroński, Krzysztof Wierzbanowski, E.C. Oliver
Abstract:The aim of this work is to study the influence of residual stresses on the properties of textured duplex stainless steel (DSS). The...
185
Authors: Qing Yang, Yong Ju Hu, Liang Xue
Abstract:This study simulated the nanofiltration (NF) process of contamination removing by back-propagation neural network (BPNN), according to the...
404
Authors: Ming Bo Wang, Rui He Wang, Xian Yong Liu
Abstract:A Realizable k-ε turbulence model in conjunction with a standard wall function has been applied to the prediction of a fully-developed...
345
Authors: Guo Hua Gao, Jing Zhao, Fei Ma, Wei Dong Luo
Chapter 2: Applied Mechanics and Mechanical Engineering
Abstract:A typical hybrid RANS-LES approach, DES (Detached Eddy Simulation), was introduced into cavitating flow simulation in this paper. The...
1187