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| Effect of Heating Process on the Amount of Austenite Retained in Medium Mn Alloyed TRIP Steel |
| QIU Chang-han1,2,LUO Hai-wen2,LIU Jun1,2,HU Jun1,2,DONG Han2 |
1. College of Material Science and Engineering, Huazhong University of Science and Technology,Wuhan 430074, Hubei， China
2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract Effect of heating processes on the retained austenite of 0.2C-5Mn steel was investigated. The microstructure evolution during heating was characterized by transmission electronic microscopy and electron backscatter diffraction. The amount of retained austenite was measured by X-ray diffraction. The results show that heating with a high rate or with an interruption at low temperature leads to more austenite formed during the intercritical annealing and then more retained after quenching. An isothermal holding at low temperature results in extensive precipitation of transition carbide which can be completely dissolved during the intercritical annealing and acts as nucleation sites of austenite grains, leading to accelerated austenitization kinetics; whilst the high heating rate could suppress both precipitation of cementite and recovery of the matrix during heating, promoting austenitization before recrystallization.
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Received: 02 April 2013
Published: 13 December 2013
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2013, Vol. 48 
