Homogenisation of austenite during non-equilibrium heating in hypereutectoid steels

Rangasayee Kannan; Yiyu Wang; Rebekah Bannister; Muhammad Rashid; Leijun Li

doi:10.1080/02670836.2018.1530422

Homogenisation of austenite during non-equilibrium heating in hypereutectoid steels

Rangasayee Kannan, Yiyu Wang, Rebekah Bannister, Muhammad Rashid, Leijun Li

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Abstract

The homogenisation (Stage III) of austenite during non-equilibrium heating of hypereutectoid steels has been characterised for the first time through dilatometric strain measurements and electron microscopic techniques. It has been found that the homogenisation temperature (A_ch) is significantly higher than the cementite dissolution temperature (A_cm). Though there is a complete conversion of low-temperature constituents to austenite above the A_cm, a significant segregation of carbon in the austenite is observed below the A_ch. Performing heat treatment with an incomplete austenitisation between the A_cm and the A_ch temperature can affect the subsequent on-cooling phase transformations. It is proposed that the A_ch temperature should be used as the full austenitisation temperature in hypereutectoid steels.

Original language	English
Pages (from-to)	2271-2286
Number of pages	16
Journal	Materials Science and Technology (United Kingdom)
Volume	34
Issue number	18
DOIs	https://doi.org/10.1080/02670836.2018.1530422
State	Published - Dec 12 2018
Externally published	Yes

Keywords

Hypereutectoid steel
austenitisation
dilatometry
homogenisation
non-equilibrium heating

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10.1080/02670836.2018.1530422

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title = "Homogenisation of austenite during non-equilibrium heating in hypereutectoid steels",

abstract = "The homogenisation (Stage III) of austenite during non-equilibrium heating of hypereutectoid steels has been characterised for the first time through dilatometric strain measurements and electron microscopic techniques. It has been found that the homogenisation temperature (Ach) is significantly higher than the cementite dissolution temperature (Acm). Though there is a complete conversion of low-temperature constituents to austenite above the Acm, a significant segregation of carbon in the austenite is observed below the Ach. Performing heat treatment with an incomplete austenitisation between the Acm and the Ach temperature can affect the subsequent on-cooling phase transformations. It is proposed that the Ach temperature should be used as the full austenitisation temperature in hypereutectoid steels.",

keywords = "Hypereutectoid steel, austenitisation, dilatometry, homogenisation, non-equilibrium heating",

author = "Rangasayee Kannan and Yiyu Wang and Rebekah Bannister and Muhammad Rashid and Leijun Li",

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T1 - Homogenisation of austenite during non-equilibrium heating in hypereutectoid steels

AU - Kannan, Rangasayee

AU - Wang, Yiyu

AU - Bannister, Rebekah

AU - Rashid, Muhammad

AU - Li, Leijun

PY - 2018/12/12

Y1 - 2018/12/12

N2 - The homogenisation (Stage III) of austenite during non-equilibrium heating of hypereutectoid steels has been characterised for the first time through dilatometric strain measurements and electron microscopic techniques. It has been found that the homogenisation temperature (Ach) is significantly higher than the cementite dissolution temperature (Acm). Though there is a complete conversion of low-temperature constituents to austenite above the Acm, a significant segregation of carbon in the austenite is observed below the Ach. Performing heat treatment with an incomplete austenitisation between the Acm and the Ach temperature can affect the subsequent on-cooling phase transformations. It is proposed that the Ach temperature should be used as the full austenitisation temperature in hypereutectoid steels.

AB - The homogenisation (Stage III) of austenite during non-equilibrium heating of hypereutectoid steels has been characterised for the first time through dilatometric strain measurements and electron microscopic techniques. It has been found that the homogenisation temperature (Ach) is significantly higher than the cementite dissolution temperature (Acm). Though there is a complete conversion of low-temperature constituents to austenite above the Acm, a significant segregation of carbon in the austenite is observed below the Ach. Performing heat treatment with an incomplete austenitisation between the Acm and the Ach temperature can affect the subsequent on-cooling phase transformations. It is proposed that the Ach temperature should be used as the full austenitisation temperature in hypereutectoid steels.

KW - Hypereutectoid steel

KW - austenitisation

KW - dilatometry

KW - homogenisation

KW - non-equilibrium heating

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ER -

Homogenisation of austenite during non-equilibrium heating in hypereutectoid steels

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Keywords

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