RESEARCH ARTICLE


NOMENCLATURE: Issues on the Surface Integrity of Case Hardened Steel Materials



N. AlagumurthiDepartment of Mechanical Engineering Pondicherry Engineering CollegePondicherry-605014IndiaE-mail: Email: alagumurthi@pec.edu


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© 2010 N. Alagumurthi;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



Abstract

Glossary
A Furnace Temperature in degree Celsius
AISI American Iron and Steel Institute
ANOVA Analysis of Variance
B Quenching time in minutes
C Tempering temperature in degree Celsius
CAopt Case depth value obtained at optimum process variable A
CBopt Case depth value obtained at optimum process variable B
CCopt Case depth value obtained at optimum process variable C
CDopt Case depth value obtained at optimum process variable D
CEopt Case depth value obtained at optimum process variable E
C.F Correction factor
D Tempering time in minutes
E Preheating temperature in degree Celsius
EN European Standards published by the European Committee for Standardization
fm Volume fraction of martensite
G1 Group 1
G2 Group 2
HAopt Hardness value obtained at optimum process variable A
HBopt Hardness value obtained at optimum process variable B
HCopt Hardness value obtained at optimum process variable C
HDopt Hardness value obtained at optimum process variable D
HEopt Hardness value obtained at optimum process variable E
HRA Rockwell Hardness A scale
HRC Rockwell Hardness C scale
LAopt Helix variation (Left) value obtained at optimum process variable A
LBopt Helix variation (Left) value obtained at optimum process variable B
LDopt Helix variation (Left) value obtained at optimum process variable C
LEopt Helix variation (Left) value obtained at optimum process variable E
Ms Starting temperature of marteniste formation
Mf Temperature of martensite transformation ends
N Number of levels
P Power potential in kW/inch2
Q Quench flow rate litres/minutes
r Number of replicates
RAopt Runout value obtained at optimum process variable A
RBopt Runout value obtained at optimum process variable B
RCopt Runout value obtained at optimum process variable C
RDopt Runout value obtained at optimum process variable D
REopt Runout value obtained at optimum process variable E
S Scan speed in meter/minutesn
SSE Sum of Squares of Error
SST Total sum of squares
SSTr Sum of Squares of Treatment with replicates
SSA Sum of Squares of Variables
Tq Quenchant temperature at which fraction of martensite is formed
TTT Temperature-Time-Transformation diagram
VHN Vickers Hardness Number
β Predicted mean response

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