Analysis of Fracture Toughness Mechanism in Ultra-fine-grained Steels

The Effect of the Treatment Developed in NIMS

  • Toshihiro Hanamura
  • Hai Qiu

Part of the NIMS Monographs book series (NIMSM)

Table of contents

About this book

Introduction

In this book, advanced steel technologies mainly developed at the National Institute for Materials Science (NIMS), Japan, for structure control, mechanical properties, and the related mechanisms are introduced and discussed. NIMS has long worked on developing advanced steel techniques, namely, producing advanced steels by using only simple alloying elements such as carbon, manganese, and silicon, and also by utilizing steel scrap. The hope is that this approach will lead to a technology of a so-called steel-to-steel recycling process, with the ultimate goal of a recycling process such as an automotive-steel-to-automotive-steel recycling process to take the place of the current cascade-type recycling system. The main idea is to utilize ultra-grain refining structures and hetero structures as well as martensite structures. In particular, the focus of this book is on tensile strength and toughness of advanced steels from both the fundamental and engineering points of view. Fundamentally, a unique approach to analysis is taken, based on fracture surface energy as effective grain size is employed to better understand the mechanism of property improvement. From the engineering point of view, in fracture toughness such factors as crack tip opening displacement (CTOD) of advanced steels are evaluated in comparison with those of conventional steels.

Keywords

CTOD Effective Grain Size Evalation of DBTT Fracture Toughness Martensite Structures Steel-to-steel Recycling Process Ultra-Fine Grained Steel Ultra-grain Refinement

Authors and affiliations

  • Toshihiro Hanamura
    • 1
  • Hai Qiu
    • 2
  1. 1.National Institute for Materials Sci.TsukubaJapan
  2. 2.National Institute for Materials Sci.TsukubaJapan

Bibliographic information

  • DOI https://doi.org/10.1007/978-4-431-54499-9
  • Copyright Information National Institute for Materials Science, Japan. Published by Springer Japan 2014
  • Publisher Name Springer, Tokyo
  • eBook Packages Chemistry and Materials Science
  • Print ISBN 978-4-431-54498-2
  • Online ISBN 978-4-431-54499-9
  • Series Print ISSN 2197-8891
  • Series Online ISSN 2197-9502
  • About this book
Industry Sectors
Pharma
Automotive
Chemical Manufacturing
Electronics
Energy, Utilities & Environment
Aerospace
Oil, Gas & Geosciences
Engineering