深层渗碳对H13钢显微组织和硬度的影响

发布时间：2019-07-12 15:03

【摘要】：采用OM、TEM和XRD对深层渗碳处理后H13钢的显微组织进行观测,研究了深层渗碳对H13钢显微组织和硬度的影响。结果表明:渗碳后完全退火试样与渗碳后球化退火试样的渗碳层厚度均在3 mm以上,组织细密均匀,硬度提高30%~60%;渗碳后球化退火试样的晶粒更细小,基体上碳化物弥散分布并存在较多的亚结构,且表面硬度稍高于渗碳后完全退火试样。最佳深层渗碳处理工艺为1000℃下固体渗碳4 h,接着进行球化退火(840℃保温4 h,炉冷到740℃再保温4 h,炉冷到500℃后空冷到室温),然后进行1030℃淬火10 min,最后进行560℃回火2次,每次2 h。
[Abstract]:The effect of deep carburizing on the microstructure and hardness of H13 steel was studied by using OM, TEM and XRD to observe the microstructure of H13 steel after deep carburizing treatment. The results show that the thickness of the carburized layer of the fully annealed sample and the spheroidizing annealing sample after the carburizing is above 3 mm, the microstructure is fine and uniform, the hardness is improved by 30-60%, the crystal grains of the spheroidized annealing sample after the carburizing are finer, the carbide dispersion in the matrix is distributed and the sub-structure is present, And the surface hardness is slightly higher than that of the fully-annealed sample after the carburization. The optimum deep-layer carburizing treatment process is at 1000 DEG C for 4 hours, then the spheroidizing annealing is carried out (heat preservation at 840 DEG C for 4 hours, the furnace is cooled to 740 DEG C for 4 hours, the furnace is cooled to 500 DEG C and then is cooled to room temperature), then the quenching is carried out for 10 minutes at the temperature of 1030 DEG C, and finally the tempering is carried out for 2 times at the temperature of 560 DEG C for 2h.
【作者单位】：大连理工大学材料科学与工程学院;沈阳鼓风机集团股份有限公司研究院;辽宁省凝固控制与数字化制备技术重点实验室;
【基金】：国家“973”项目(2011CB013402) 辽宁省自然科学基金(2014028002) 辽宁省科技创新重大专项(201303002) 辽宁重大装备制造协同创新中心沈鼓-大工重大科研发展基金中央高校基本科研业务费专项资金资助项目
【分类号】：TG156.81

【参考文献】