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Metallurgical and Materials Transactions A

, Volume 47, Issue 10, pp 4777–4783 | Cite as

Low-Temperature Toughness of the Austempered Offshore Steel

  • C. Yu
  • T. C. Yang
  • C. Y. Huang
  • R. K. ShiueEmail author
Communication

Abstract

This study investigates low-temperature toughness of the offshore steel with two different austempering heat treatments. Toughness of upper bainite is significantly lower than that of lower bainite. Low impact toughness of the upper bainite is caused by the presence of martensite–austenite (MA) and increasing the amount of low-angle lath boundaries in upper bainite package. EBSD equipped in the SEM demonstrates an effective approach to analyze the misorientation angle of lath boundaries in upper bainite packet.

Keywords

Bainite Impact Toughness Austempering Lower Bainite Lath Boundary 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

The authors gratefully acknowledge the financial support for this research provided by the Ministry of Science and Technology (MOST), Taiwan, under Grant Number MOST 103-2622-E-006-037 and 104-2622-E-006-001.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • C. Yu
    • 1
  • T. C. Yang
    • 2
  • C. Y. Huang
    • 2
  • R. K. Shiue
    • 1
    Email author
  1. 1.Department of Materials Science and EngineeringNational Taiwan UniversityTaipeiTaiwan
  2. 2.China Steel CorporationKaohsiungTaiwan

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