冷却速率对轴承钢GCr15组织和性能的影响
Effect of Cooling Rate on Microstructures and Properties of GCr15 Bearing Steel
DOI: 10.12677/MEng.2016.32015,
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作者:
王银国, 董凤奎, 何健楠:宝钢特钢韶关有限公司,广东 韶关;孙福猛, 李祥龙, 李世晶:宝钢集团广东韶关钢铁有限公司,广东 韶关
关键词:
轴承钢GCr15;CCT曲线;冷却工艺;网状碳化物;Bear Steel GCr15; CCT Curve; Cooling Process; Net Carbide
摘要:
本文采用光学显微镜、显微硬度等分析手段对某钢厂生产的GCr15轴承钢在不同冷却速度下的奥氏体相变规律进行了研究。结果表明:发生珠光体相变的临界冷却速度约为3℃/s,当温度降至约200℃时,发生马氏体转变。冷却速度小于5℃/s时,会产生较严重的网状碳化物,随冷却速度的提高,网状碳化物析出减少,珠光体相变温度降低。
Abstract:
The Austenite phase transformation law of GCr15 bearing steel with different processes is studied by means of optical microscope and hardness tester. The experimental results show that: the critical cooling rate of pearlite phase transformation is about 3˚C/s and the Martensite transfor-mation starts when the temperature drops at about 200˚C. There will be a serious precipitation of net carbide when the cooling rate is less than 5˚C/s, and with the increase of cooling rate, the pearlite phase transformation temperature becomes lower and the precipitation of net carbide decreases.