GCr15轴承钢渗碳体球化的长大机制Spheroidizing growth mechanism of cementite in GCr15 bearing steel
杨洪波,王快社,王庆娟,朱伏先
摘要(Abstract):
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(KeyWords): GCr15钢;渗碳体;球化长大机制;相变机制;Ostwald熟化
基金项目(Foundation): 国家自然科学基金(50634030);; 陕西省自然科学基金(2012JQ7029);; 西安建筑科技大学青年科技基金(QN1002);西安建筑科技大学人才科技基金(RC1014)
作者(Author): 杨洪波,王快社,王庆娟,朱伏先
DOI: 10.13289/j.issn.1009-6264.2012.08.016
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