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| Influence of α-Cr phase on new kind of austenitic alloy heat treatment organization and performance |
| YANG Jin-wen1,2，ZHOU Wang-song2,3，LU Jian-sheng1，YU Feng2，XU Da2， CAO Wen-quan2 |
1. Faculty of Materials Science and Engineering， Kunming University of Science and Technology， Kunming 650093， Yunnan， China
2. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China
3. School of Metallurgical Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， Shaanxi， China |
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Abstract The effects of solid solution and aging treatment on the microstructure and hardness were studied through the combination of TEM， optical microscope and Rockwell hardness. Results indicated that the increase of the solid solution temperature would result in the decrease of the volume fraction of a-Cr phase，refining the grain size and lowering of the hardness and. The solid solution treatment was mainly controlled by the bulk diffusion of Cr in the austenite with a diffusion activation energy of （443±37） kJ/mol. After aging， the a-Cr particle size ranged from 0.5-2.0 μm with average value of about 1.6 μm. The hardness of the alloy after aging was mainly determined by the quantity of α-Cr in the matrix， which could give 61.5HRC in the maximum. Based on the study of the solution and aging treatment， it was proposed that solid solution temperature of GNiCRr40Al3Ti should be higher than 1 150 ℃ to fulfill its high hardness and machining requirement.
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Received: 20 October 2014
Published: 06 July 2015
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2015, Vol. 50 
