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Final Year Project Grain Boundary Engineering of Stainless Steels

Sample Preparation

10% oxalic acid etch

ASTM A262 practice A

Heat Treaments

(1) no heat treatment (5% CW only) (2) 1100C / 5 min. (3) 1100C / 30 min. (4) 1100C / 180 min. (5) 1050C / 30 min. (6) 1050C / 180 min. (7) 950C / 180 min. (8) 950C / 1440 min. (9) 900C / 1440 min. (10) 850C / 1440 min.

Sectioning

Health and Safety

Testing

Mechanical Properties Testing

Microhardness

Compressive Strength

Corrosion Testing

pH-modified tetrathionate solution (K2S4O6)

Report Topics

Conlcusions

Results and Analysis

Experiemental Proceedures

Literature Survey

Grain Characterisation

Stainless Steels

Corrosion Resistance

Introduction

Grain Boundary Engineering

Literature survey

Surface effects

EBSD - microstructure development with depth from rolling

Effect of straining - 5%CW

Grain Boundaries

Brandon Criteria can theoretically predict GB misorientations

Special Boundaries - Sigma (fit)

Fit (sigma value)

determines degree of order

Grain Boundary Character Distribution

High Order Twin Boundaries

Twin Boundaries

Low Angle/High Angle GB

Coincident Site Lattice (CSL)

See Dr Mcleans structural materials book.

depending on misorientation angle - can predict grain boundary structure (wanatabe lecture)

Analyses

Image Processesing

using ASTM standard

modifying with matlab

EBSD

White Light Interferometry

SEM Examination

Grain Count

ASTM E112 - 96