工程科学学报2016，Vol.38Issue(12)：1720-1727,8.DOI:10.13374/j.issn2095-9389.2016.12.009
电渣重熔过程冷却强度对含镁H13钢中碳化物的影响
Effect of cooling intensity on carbides in Mg-containing H13 steel during the electroslag remelting process
摘要
Abstract
The effect of cooling intensity on the carbide segregation and solidification microstructure of an H13 as-cast ingot with Mg addition was studied during the electroslag remehing process.The solidification microstructure and the carbide characteristics of the steel were analyzed by optical microscopy,scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis.The results show that the solidification microstructure of the ingot consists of martensite,retained austenite and primary carbides.Carbides in the electroslag remelting ingot are V8 C7,MC,M23 C6 and M6 C.With the increasing of cooling intensity,the size of carbides in the edge of the electroslag remelting ingot decreases,the distribution of these carbides becomes more homogeneous,but the types of carbides remain unchanged.Increasing the cooling intensity improves the modification of inclusions by Mg.The formed MgO· Al2O3 arising from Mg treatment provides preferred nucleation sites for TiN.These complex inclusions promote the heterogeneous nucleation of primary carbides,consequently refining primary carbides.关键词
模具钢/电渣重熔/冷却/微观组织/碳化物Key words
die steel/electroslag remelting/cooling/microstructure/carbides分类
矿业与冶金引用本文复制引用
贺宝,李晶,史成斌,王昊..电渣重熔过程冷却强度对含镁H13钢中碳化物的影响[J].工程科学学报,2016,38(12):1720-1727,8.基金项目
国家自然科学基金资助项目(51374022) （51374022）
