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Microscopy study of the onset of plastic deformation and modeling creep behavior of AISI 420 stainless steel

Zijlstra, G. (2014) Microscopy study of the onset of plastic deformation and modeling creep behavior of AISI 420 stainless steel. Master's Thesis / Essay, Physics.

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Abstract

The aim of this study is to experimentally optimize a creep model for AISI 420 stainless steel and use this model to predict the shape change of shaver caps during a heat treatment. This is obtained by investigating the microstructure, mechanical properties and thermal expansion characteristics, in the range 22 deg.C – 800 deg.C. The material in the as-received condition is fully ferritic, textured due to rolling and contains a small amount of stored strain. The anisotropic behavior is observed in Young’s modulus and very small in the volume drop at the start of austenization at 809 deg.C. With a cooling rate higher than 50 deg.C/min, perlite is avoided and only martensite forms at about 360 deg.C. For creep at 500 deg.C dislocation climb, and at 600 deg.C dislocation glide is rate controlling. Creep enables the material to relax residual stresses. The implementation of the creep model in the Philips FEM-solver Crystal, is validated with creep and stress relaxation tests. Application of the calibrated creep model on the calculations of a cup with heat treatment shows distortions of the same order of magnitude shaver caps have.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:58
Last Modified: 15 Feb 2018 07:58
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/11996

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