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| GCr15轴承钢渗碳体球化的长大机制 | |
| 引用本文： | 杨洪波,王快社,王庆娟,朱伏先.GCr15轴承钢渗碳体球化的长大机制[J].材料热处理学报,2012,33(8):79-83. |
| 作者姓名： | 杨洪波 王快社 王庆娟 朱伏先 |
| 作者单位： | 1. 西安建筑科技大学冶金工程学院,陕西西安710055／东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004 2. 西安建筑科技大学冶金工程学院,陕西西安,710055 3. 东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳,110004 |
| 基金项目： | 国家自然科学基金，陕西省自然科学基金，西安建筑科技大学青年科技基金，西安建筑科技大学人才科技基金 |
| 摘 要： | 利用扫描电镜(SEM)对渗碳体粒化后冷却至710℃保温不同时间淬火的GCr15轴承钢渗碳体的球化长大行为进行研究。结果表明:渗碳体颗粒球化长大由相变和Ostwald熟化两种机制实现,保温时间少于240 min时主要为相变机制,保温时间多于240 min时主要为Ostwald熟化机制;渗碳体颗粒全面起动Ostwald熟化机制的临界半径γc为0.105μm;无论是相变机制还是Ostwald熟化机制,晶界处渗碳体颗粒的平均长大速率(0.0056μm/min)高于晶粒内部渗碳体颗粒的平均长大速率。 |
| 关 键 词： | GCr15钢 渗碳体 球化长大机制 相变机制 Ostwald熟化 |
Spheroidizing growth mechanism of cementite in GCr15 bearing steel |
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| YANG Hong-bo,WANG Kuai-she,WANG Qing-juan,ZHU Fu-xian.Spheroidizing growth mechanism of cementite in GCr15 bearing steel[J].Transactions of Materials and Heat Treatment,2012,33(8):79-83. | |
| Authors: | YANG Hong-bo WANG Kuai-she WANG Qing-juan ZHU Fu-xian |
| Affiliation: | 1.School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055, China;2.State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110004,China) |
| Abstract: | Spheroidizing behaviour of GCr15 bearing steel annealed at 710 ℃ for different holding time was investigated by SEM.The results indicate that the spheroidization of cementite particles is achieved by spheroidizing mechanism of phase transformation and Ostwald ripening mechanism.When holding time is less than 240 min,the spheroidizing mechanism of phase transformation takes place,otherwise,the Ostwald ripening mechanism works.The critical radius γc with which the latter mechanism initiates is approximately 0.105 μm.At the same time,the average spheroidizing growth rate(0.0056 μm/min) of cementite particles at the grain boundary is higher than that in the grain. |
| Keywords: | GCr15 steel cementite spheroidizing growth mechanism phase transformation spheroidizing Ostwald ripening |
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