Effect of Heat Treatment on Mechanical Properties and Microstructure of L80-13Cr Martensitic Stainless Steel

Yilong Zhang, Wei Wu, Bingbing Li, Dezhi Yuan, Kejian Li, Kessam Shin, Pengjun Cao

2018

Abstract

L80-13Cr martensitic stainless steel (MSS) is a kind of oil casing steel. It has good resistance to carbon dioxide corrosion and seawater corrosion, which makes it common oil casing steel in marine oil and gas exploration. The effect of heat treatment on mechanical properties and microstructure of L80-13Cr MSS has been studied. The specimens were analyzed using the micro-hardness test, optical microscope (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The hardness test showed that the steel was secondarily hardened when tempering at 300 ~ 500C. But continuous softening occurred when the temperature was above 500C. The martensite was recovered at temperatures around 300 ~ 500C, and higher temperature tempering (600C) caused grain growth and even recrystallization. It has been found that the precipitates in the steels that were tempered at 300C, 500C and 700C, were need-like Fe3C carbides, coarsed needle-like Fe3C carbides and rod-like or sphere-like Cr23C6 carbides. Especially when tempered at 700C, the Cr23C6carbidesprecipitation along the marten site lath was rod-like and precipitation along grain boundaries was sphere-like. Secondary hardening between 300 ~ 500C tempering of 13Cr is attributed to the precipitation of needle-like Fe3C. The recovery and recrystallization of the matrix and the coarsening of carbides resulted in the continuous softening of 13Cr MSS during tempering.

Paper Citation

in Harvard Style

Zhang Y., Wu W., Li B., Yuan D., Li K., Shin K. and Cao P. (2018). Effect of Heat Treatment on Mechanical Properties and Microstructure of L80-13Cr Martensitic Stainless Steel.In Proceedings of the 2nd International Conference on Intelligent Manufacturing and Materials - Volume 1: ICIMM, ISBN 978-989-758-345-2, pages 10-14. DOI: 10.5220/0007525300100014

in Bibtex Style

@conference{icimm18,
author={Yilong Zhang and Wei Wu and Bingbing Li and Dezhi Yuan and Kejian Li and Kessam Shin and Pengjun Cao},
title={Effect of Heat Treatment on Mechanical Properties and Microstructure of L80-13Cr Martensitic Stainless Steel},
booktitle={Proceedings of the 2nd International Conference on Intelligent Manufacturing and Materials - Volume 1: ICIMM,},
year={2018},
pages={10-14},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007525300100014},
isbn={978-989-758-345-2},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 2nd International Conference on Intelligent Manufacturing and Materials - Volume 1: ICIMM,
TI - Effect of Heat Treatment on Mechanical Properties and Microstructure of L80-13Cr Martensitic Stainless Steel
SN - 978-989-758-345-2
AU - Zhang Y.
AU - Wu W.
AU - Li B.
AU - Yuan D.
AU - Li K.
AU - Shin K.
AU - Cao P.
PY - 2018
SP - 10
EP - 14
DO - 10.5220/0007525300100014