Effect of Multi-Step Tempering on Retained Austenite and Mechanical Properties of Low Alloy Steel

被引：0
作者：
Hamid Reza Bakhsheshi-Rad
Ahmad Monshi
Hossain Monajatizadeh
Mohd Hasbullah Idris
Mohammed Rafiq Abdul Kadir
Hassan Jafari
机构：
[1] Islamic Azad University,Materials Engineering Department
[2] Najafabad Branch,Materials Engineering Department, Faculty of Mechanical Engineering
[3] University Technology Malaysia,Materials Engineering Department
[4] Faculty of Mechanical Engineering,undefined
[5] Shahid Rajaee Teacher Training University,undefined
来源：
Journal of Iron and Steel Research International | 2011年 / 18卷
关键词：
cold back-up roll; retained austenite; mechanical property; austenite grain size;
D O I：
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中图分类号：
学科分类号：
摘要：
The effect of multi-step tempering on retained austenite content and mechanical properties of low alloy steel used in the forged cold back-up roll was investigated. Microstructural evolutions were characterized by optical microscope, X-ray diffraction, scanning electron microscope and Feritscope, while the mechanical properties were determined by hardness and tensile tests. The results revealed that the content of retained austenite decreased by about 2% after multi-step tempering. However, the content of retained austenite increased from 3. 6% to 5. 1% by increasing multi-step tempering temperature. The hardness and tensile strength increased as the austenitization temperature changed from 800 to 920 °C, while above 920 °C, hardness and tensile strength decreased. In addition, the maximum values of hardness, ultimate and yield strength were obtained via triple tempering at 520 °C, while beyond 520 °C, the hardness, ultimate and yield strength decreased sharply
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页码：49 / 56
页数：7
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