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

钢铁研究学报(英文版), 2011, 18(12): 49-56.

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

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1.Materials Engineering Department, Islamic Azad University, Najafabad Branch, Isfahan 517, Iran

2.Materials Engineering Department, Islamic Azad University, Najafabad Branch, Isfahan 517, Iran

3.Materials Engineering Department, Islamic Azad University, Najafabad Branch, Isfahan 517, Iran

4.Materials Engineering Department, Faculty of Mechanical Engineering, University Technology Malaysia, Skudai 81310, Johor, Malaysia

5.Materials Engineering Department, Faculty of Mechanical Engineering, University Technology Malaysia, Skudai 81310, Johor, Malaysia

6.Materials Engineering Department, Faculty of Mechanical Engineering, University Technology Malaysia, Skudai 81310, Johor, Malaysia／Materials Engineering Department, Faculty of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran 16785-136, Iran

关键词：残余奥氏体 , 回火温度 , 低合金钢 , 多步 , 机械性能 , 扫描电子显微镜 , X射线衍射仪 , 奥氏体化温度

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

Keywords： cold back-up roll , retained austenite , mechanical property , austenite grain size ,

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 ℃,while above 920 ℃,hardness and tensile strength decreased.In addition,the maximum values of hardness,ultimate and yield strength were obtained via triple tempering at 520 ℃,while beyond 520 ℃,the hardness,ultimate and yield strength decreased sharply.

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

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

参考文献