Production Gas Carburising - 1st Edition - ISBN: 9780080273129, 9781483152349

Production Gas Carburising

1st Edition

The Pergamon Materials Engineering Practice Series

Authors: G. Parrish G. S. Harper
Editors: D. W. Hopkins J. R. Barratt T. Bell
eBook ISBN: 9781483152349
Imprint: Pergamon
Published Date: 1st January 1985
Page Count: 330
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Description

Production Gas Carburising discusses the aspects of gas carburising for practical application. The book covers the fundamentals up to the advance concepts of gas carburising. The first few chapters tackle the basic aspects of gas carburising, including its history and fundamental principles. Later chapter covers the much more advance concepts. The topics this book covers include reasons for case carburising; hardness and hardenability; residual stress; carburising theory; control for the carburising process; quality control; and aspects of safety. Professionals whose work includes carburising, such as design engineers, will find this book of great interest.

Table of Contents


1. Introduction

2. Reasons for Case Carburising

Bending Fatigue

Contact Damage

Wear

3. The Hardening of Steels

Heat Treatment—Heating

The Effect of Slow Cooling

The Effect of Fast Cooling

Hardness and the Carbon Gradient

4. Hardness and Hardenability

Core Hardness and Hardenability

Material Selection—Jominy Data

Variability

Significance of Core Strength

Case Hardness and Hardenability

5. Residual Stresses

6. Design for Carburising

Alternative Processes

Design Considerations

Material Considerations

Process Considerations

Process Specifications

7. Carburising Theory

Reactions within the Gas Phase

Transport in the Boundary Layer

Reactions at the Gas-Metal Interface

Carburising in CH4:H2 Mixtures

Carburising in CO:CO2 Mixtures

Carburising in CO:H2:H2O Mixtures

Carburising in CO:CO2:CH4:H2:H2O:N2 Mixtures

Diffusion

Summary

8. Carburising Atmospheres: Their Production and Control

Introduction

Generator Practice

Control of Endothermic Generators

Nitrogen-Based Atmospheres

Economics

Cost Comparison of Alternative Atmospheres

Control of Carburising Atmospheres

9. Control of the Carburising Process

Introduction

Determination of Required Carbon Profile

Determination of Process Parameters

Process Control

Atmosphere Control

10. Furnaces and Equipment

Furnace Types

Batch Furnaces

Continuous Furnaces

11. Pre-Carburising and Post-Carburising Heat Treatments

Pre-Carburising Heat Treatments

Softening

Pre-Carburising Quenching Treatment

Post-Carburising Heat Treatments

Austenitising for Hardening

Practical Hardening Treatments

Local Hardening

Effect of Austenitising Temperature on Properties

Effect of Quenching

Tempering

Refrigeration

12. Quality Control

Materials Acceptance

In-process Testing

Final Inspection

13. Distortion

Effect of Phase Changes on the Specific Volume of Steel

Thermal Gradients

Stress Relief

Thermal Stresses

Transformation Stresses

Thermal Stresses and Transformation Stresses

Uniformity of Heating and Cooling and Geometry of the Component

Chemical Composition

Effect of Other Production Variables

Post-Hardening Corrective Treatments

14. Microstructures in Case-Hardened Surfaces

Internal Oxidation

Decarburisation

Carbides

Retained Austenite

Bainite

15. Aspects of Safety

Responsibility

Safety in the Heat Treatment Department—General

First Aid

Hygiene

Protective Clothing and Footwear

Fire-Fighting Equipment

Ventilation and Gas Detectors

Parting Comment

16. Concluding Remarks

Appendices

A. An Example of the Use of Fatigue Test Data

B. Continuous-Cooling Transformation Diagrams

C. Cooling Curves

D. Theoretical Determination of Case Depth

Index

Details

No. of pages:
330
Language:
English
Copyright:
© Pergamon 1985
Published:
Imprint:
Pergamon
eBook ISBN:
9781483152349

About the Author

G. Parrish

G. S. Harper

About the Editor

D. W. Hopkins

Affiliations and Expertise

University College of Swansea, UK

J. R. Barratt

T. Bell