Effect of heat treatment on microstructure and hardness of grade 91 steel

Triratna Shrestha; Sultan F. Alsagabi; Indrajit Charit; Gabriel P. Potirniche; Michael V. Glazoff

doi:10.3390/met5010131

Effect of heat treatment on microstructure and hardness of grade 91 steel

Triratna Shrestha
, Sultan F. Alsagabi
, Indrajit Charit
, Gabriel P. Potirniche
, Michael V. Glazoff

Materials, Manufacturing, & Bioenergy S&T

Research output: Contribution to journal › Article › peer-review

95 Scopus citations

Abstract

Grade 91 steel (modified 9Cr-1Mo steel) is considered a prospective material for the Next Generation Nuclear Power Plant for application in reactor pressure vessels at temperatures of up to 650 °C. In this study, heat treatment of Grade 91 steel was performed by normalizing and tempering the steel at various temperatures for different periods of time. Optical microscopy, scanning and transmission electron microscopy in conjunction with microhardness profiles and calorimetric plots were used to understand the microstructural evolution including precipitate structures and were correlated with mechanical behavior of the steel. Thermo-Calc™ calculations were used to support the experimental work. Furthermore, carbon isopleth and temperature dependencies of the volume fraction of different precipitates were constructed.

Original language	English
Pages (from-to)	131-149
Number of pages	19
Journal	Metals
Volume	5
Issue number	1
DOIs	https://doi.org/10.3390/met5010131
State	Published - Jan 21 2015

Keywords

Differential scanning calorimetry
Grade 91 steel
Heat treatment
Microstructure
Modified 9Cr-1Mo steel
Precipitates
Thermo-calc™

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10.3390/met5010131

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title = "Effect of heat treatment on microstructure and hardness of grade 91 steel",

abstract = "Grade 91 steel (modified 9Cr-1Mo steel) is considered a prospective material for the Next Generation Nuclear Power Plant for application in reactor pressure vessels at temperatures of up to 650 °C. In this study, heat treatment of Grade 91 steel was performed by normalizing and tempering the steel at various temperatures for different periods of time. Optical microscopy, scanning and transmission electron microscopy in conjunction with microhardness profiles and calorimetric plots were used to understand the microstructural evolution including precipitate structures and were correlated with mechanical behavior of the steel. Thermo-Calc{\texttrademark} calculations were used to support the experimental work. Furthermore, carbon isopleth and temperature dependencies of the volume fraction of different precipitates were constructed.",

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doi = "10.3390/met5010131",

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T1 - Effect of heat treatment on microstructure and hardness of grade 91 steel

AU - Shrestha, Triratna

AU - Alsagabi, Sultan F.

AU - Charit, Indrajit

AU - Potirniche, Gabriel P.

AU - Glazoff, Michael V.

PY - 2015/1/21

Y1 - 2015/1/21

N2 - Grade 91 steel (modified 9Cr-1Mo steel) is considered a prospective material for the Next Generation Nuclear Power Plant for application in reactor pressure vessels at temperatures of up to 650 °C. In this study, heat treatment of Grade 91 steel was performed by normalizing and tempering the steel at various temperatures for different periods of time. Optical microscopy, scanning and transmission electron microscopy in conjunction with microhardness profiles and calorimetric plots were used to understand the microstructural evolution including precipitate structures and were correlated with mechanical behavior of the steel. Thermo-Calc™ calculations were used to support the experimental work. Furthermore, carbon isopleth and temperature dependencies of the volume fraction of different precipitates were constructed.

AB - Grade 91 steel (modified 9Cr-1Mo steel) is considered a prospective material for the Next Generation Nuclear Power Plant for application in reactor pressure vessels at temperatures of up to 650 °C. In this study, heat treatment of Grade 91 steel was performed by normalizing and tempering the steel at various temperatures for different periods of time. Optical microscopy, scanning and transmission electron microscopy in conjunction with microhardness profiles and calorimetric plots were used to understand the microstructural evolution including precipitate structures and were correlated with mechanical behavior of the steel. Thermo-Calc™ calculations were used to support the experimental work. Furthermore, carbon isopleth and temperature dependencies of the volume fraction of different precipitates were constructed.

KW - Differential scanning calorimetry

KW - Grade 91 steel

KW - Heat treatment

KW - Microstructure

KW - Modified 9Cr-1Mo steel

KW - Precipitates

KW - Thermo-calc™

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U2 - 10.3390/met5010131

DO - 10.3390/met5010131

M3 - Article

AN - SCOPUS:84937546413

SN - 2075-4701

VL - 5

SP - 131

EP - 149

JO - Metals

JF - Metals

IS - 1

ER -

Effect of heat treatment on microstructure and hardness of grade 91 steel

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Keywords

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