Austenite layer and precipitation in high Co-Ni maraging steel

Chenchong Wang; Chi Zhang; Zhigang Yang

doi:10.1016/j.micron.2014.07.008

Austenite layer and precipitation in high Co-Ni maraging steel

Micron. 2014 Dec:67:112-116. doi: 10.1016/j.micron.2014.07.008. Epub 2014 Aug 4.

Authors

Chenchong Wang¹, Chi Zhang², Zhigang Yang¹

Affiliations

¹ Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
² Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. Electronic address: chizhang@tsinghua.edu.cn.

PMID: 25129424
DOI: 10.1016/j.micron.2014.07.008

Abstract

In high Co-Ni maraging steel, austenite has a great effect on the fracture toughness of the steel and the precipitated carbides are the main strengthening phase. In this study, both austenite layers and precipitation were observed and their formation theory was analyzed by Thermo-Calc simulation and several reported results. TEM and HRTEM observation results showed that the thickness of the austenite layers was about 5-10 nm and the length of the needle-like precipitated carbides was less than 10nm. The carbides maintained coherent or semi-coherent relation with the matrix.

Keywords: Austenite layer; High resolution transmission electron microscopy; Precipitated carbides.