H13热作模具钢在850℃保温2 h后,以25℃/h速度缓慢冷却至室温。用SEM观察合金组织经球化退火处理后的形态变化,用EDS、XRD、TEM和萃取分离方法对H13钢退火态中碳化物进行了定性和定量分析。结果表明,经850℃球化退火处理后,合金中原有的马氏体组织和珠光体组织基本转化成球状碳化物,主要碳化物类型有4种：MC、M6C、M7C3、M23C6,而且不同类型的碳化物所含的主要合金元素不同,MC中的主要合金元素为V,M7C3和M23C6中的主要合金元素为Cr,M6C中的主要合金元素为Mo和Cr。
Hot-work die steel H13 was spheroidized at 850 ℃ for 2 h.The microstructure of the steel after spheroidal annealing treatment was observed by SEM.Carbides in the annealed H13 steel were analyzed by means of SEM and EDS,XRD,TEM and extraction method.The results show that the spheroidal carbides of MC,M6C,M7C3 and M23C6 are observed in the steel after the spheroidizing annealing treatment.The major alloying element in MC is vanadium and in M7C3 and M23C6 is chromium,while molybdenum and chromium are the main alloying elements in M6C,which indicates that the alloying elements are different in different spheroidal carbides.
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