Final Year Project

Mer som dette

The Design Cycle Alexander Castro

Ved Alexander Castro

Ubiquitous computing

Ved Laura Daniela

DIFFERENT MODELS AND MATERIAL

Ved KRISTINA MARÍA NARANJO VERDUZCO

Mind Map Assignment sw

Ved Samantha Winston

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