摘要
采用喷射成形工艺制备了高合金工模具钢,对沉积坯进行了热锻致密化处理和淬火+回火热处理。对比分析了喷射沉积态合金和电渣重熔态合金的组织形态和力学性能。结果表明:喷射成形材料晶粒组织为均匀细小的等轴晶,碳化物细小且弥散分布,有效解决熔铸态合金热锻后仍无法完全消除的成份偏析和粗大网状碳化物的问题。由于喷射沉积态材料具有良好的组织形态,使得喷射沉积态的强度和冲击韧性比电渣重熔态分别提高了40%和18%。由于喷射沉积态材料中非金属夹杂物的影响,使得材料的冲击韧性值偏低,有待进一步优化工艺,减少夹杂物的含量,提高材料的力学性能。
High alloy tool steel was fabricated by spray forming technology. The deposited billets were compacted by hot forging. The microstructure, hardness, strength and impact toughness of spray formed materials were compared with materials prepared by electroslag remelting technology （ESR）. The results show that spray-formed material has uniform and small equiaxed grains and its carbides are dispersed and small. The segregation and non-uni-form carbide which exist in as-cast material were removed. Because of the good microstruc- ture,the strength and impact toughness of spray-formed material increased by 40% and 18% in comparison with as-cast material. But the impact toughness value was still low because of non-metallic inclusions. In order to improve the mechanical properties of spray formed materials, measures should be taken to optimize the process and to reduce the content of non-metallic inclusions.
出处
《粉末冶金工业》
CAS
北大核心
2009年第4期14-19,共6页
Powder Metallurgy Industry
基金
国家自然科学基金(50774035)
关键词
喷射成形
高合金工具钢
组织性能
电渣重熔
spray forming
high alloy tool steel
structure and property
electroslag remelting
