Effect of Zr Microalloying on Austenite Grain Size of Low-Carbon Steels

Minghao Shi; Rangasayee Kannan; Jian Zhang; Xiaoguang Yuan; Leijun Li

doi:10.1007/s11663-019-01701-1

Effect of Zr Microalloying on Austenite Grain Size of Low-Carbon Steels

Minghao Shi, Rangasayee Kannan, Jian Zhang, Xiaoguang Yuan, Leijun Li

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

14 Scopus citations

Abstract

The effect of microalloying addition of Zr on the characteristics of inclusions and prior austenite grain sizes following a quench heat treatment has been investigated for two custom-made steels. The average size of particles in the Zr-containing steel is found to be the same as the Zr-free steel (0.49 μm). However, the number of smaller particles in the Zr-containing steel is much higher than the Zr-free steel. The inclusions in the Zr-containing steel are composed of ZrO₂-TiN-MnS, and inclusions in the Zr-free steel are consisted of TiOx-Ti(C,N). The average prior austenite grain size of the Zr-containing steel is consistently smaller than that of the Zr-free steel, due to a large number of fine oxide inclusions and Ti(C,N) precipitates, working to pin the austenite grain boundaries at temperatures up to 1673 K (1400 °C). The grain refinement mechanisms by inclusions through the addition of Zr are discussed via thermodynamic and kinetic calculations.

Original language	English
Pages (from-to)	2574-2585
Number of pages	12
Journal	Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume	50
Issue number	6
DOIs	https://doi.org/10.1007/s11663-019-01701-1
State	Published - Dec 1 2019
Externally published	Yes

Funding

Minghao Shi gratefully acknowledges the financial support from China Scholarship Council.

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10.1007/s11663-019-01701-1

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title = "Effect of Zr Microalloying on Austenite Grain Size of Low-Carbon Steels",

abstract = "The effect of microalloying addition of Zr on the characteristics of inclusions and prior austenite grain sizes following a quench heat treatment has been investigated for two custom-made steels. The average size of particles in the Zr-containing steel is found to be the same as the Zr-free steel (0.49 μm). However, the number of smaller particles in the Zr-containing steel is much higher than the Zr-free steel. The inclusions in the Zr-containing steel are composed of ZrO2-TiN-MnS, and inclusions in the Zr-free steel are consisted of TiOx-Ti(C,N). The average prior austenite grain size of the Zr-containing steel is consistently smaller than that of the Zr-free steel, due to a large number of fine oxide inclusions and Ti(C,N) precipitates, working to pin the austenite grain boundaries at temperatures up to 1673 K (1400 °C). The grain refinement mechanisms by inclusions through the addition of Zr are discussed via thermodynamic and kinetic calculations.",

author = "Minghao Shi and Rangasayee Kannan and Jian Zhang and Xiaoguang Yuan and Leijun Li",

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AU - Shi, Minghao

AU - Kannan, Rangasayee

AU - Zhang, Jian

AU - Yuan, Xiaoguang

AU - Li, Leijun

PY - 2019/12/1

Y1 - 2019/12/1

N2 - The effect of microalloying addition of Zr on the characteristics of inclusions and prior austenite grain sizes following a quench heat treatment has been investigated for two custom-made steels. The average size of particles in the Zr-containing steel is found to be the same as the Zr-free steel (0.49 μm). However, the number of smaller particles in the Zr-containing steel is much higher than the Zr-free steel. The inclusions in the Zr-containing steel are composed of ZrO2-TiN-MnS, and inclusions in the Zr-free steel are consisted of TiOx-Ti(C,N). The average prior austenite grain size of the Zr-containing steel is consistently smaller than that of the Zr-free steel, due to a large number of fine oxide inclusions and Ti(C,N) precipitates, working to pin the austenite grain boundaries at temperatures up to 1673 K (1400 °C). The grain refinement mechanisms by inclusions through the addition of Zr are discussed via thermodynamic and kinetic calculations.

AB - The effect of microalloying addition of Zr on the characteristics of inclusions and prior austenite grain sizes following a quench heat treatment has been investigated for two custom-made steels. The average size of particles in the Zr-containing steel is found to be the same as the Zr-free steel (0.49 μm). However, the number of smaller particles in the Zr-containing steel is much higher than the Zr-free steel. The inclusions in the Zr-containing steel are composed of ZrO2-TiN-MnS, and inclusions in the Zr-free steel are consisted of TiOx-Ti(C,N). The average prior austenite grain size of the Zr-containing steel is consistently smaller than that of the Zr-free steel, due to a large number of fine oxide inclusions and Ti(C,N) precipitates, working to pin the austenite grain boundaries at temperatures up to 1673 K (1400 °C). The grain refinement mechanisms by inclusions through the addition of Zr are discussed via thermodynamic and kinetic calculations.

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JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

IS - 6

ER -

Effect of Zr Microalloying on Austenite Grain Size of Low-Carbon Steels

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