TiC钢结硬质合金与堆焊过渡层的界面组织及性能研究
Study on Microstructure and Performance of Interface between TiC Steel Bonded Carbide and Surfacing Transition Layer
吴书菲 1魏炜 2马贺祥 1陈永 1刘胜新 1黄智泉2
作者信息
- 1. 郑州大学 材料科学与工程学院,河南 郑州 450001
- 2. 郑州机械研究所有限公司,河南 郑州 450001
- 折叠
摘要
采用ERNiCrMo-3 焊丝在TiC钢结硬质合金上堆焊过渡层,使用扫描电子显微镜、能谱仪、显微硬度计、万能试验机对不同热输入下TiC钢结硬质合金/ERNiCrMo-3 熔敷金属界面的组织性能进行研究.结果表明:TiC钢结硬质合金和ERNiCrMo-3 熔敷金属之间存在厚度为 60～150 μm的熔合区.随着焊接热输入的增加,熔合区的厚度逐渐增加;当热输入为 3.5 kJ/cm时,界面处组织分布均匀,无气孔、裂纹以及晶粒异常长大现象.母材和堆焊金属之间存在元素扩散现象,二者实现了冶金结合;母材和堆焊焊缝之间存在一个硬度逐渐变化的缓冲区域;TiC钢结硬质合金/ERNiCrMo-3 堆焊金属界面剪切强度最高可达到 443 MPa,满足恶劣工况下对耐磨件与基体结合性能的要求.
Abstract
The transition layer was deposited on TiC steel-bonded cemented carbide by using ERNiCrMo-3 welding wire.The microstructures and properties of interface between TiC steel bonded cemented carbide and ERNiCrMo-3 surfacing layer under different heat inputs were studied by using scanning electron microscopy,EDS spectrometer,microhardness tester and universal testing machine.The results show that there is a fusion zone with a thickness of 60-150 μm between TiC steel-bonded cemented carbide and ERNiCrMo-3 surfacing metal.With the increase of welding heat input,the thickness of the fusion zone gradually increases.When the heat input is 3.5 kJ/cm,the microstructure of the interface is uniform,without pores,cracks and abnormal grain growth phenomenon.There is element diffusion between the base metal and the surfacing weld,and the metallurgical bonding is realized.There is a buffer zone with gradually varying hardness change between the base metal and the surfacing weld.The highest shear strength of TiC steel bonded cemented carbide/ERNiCrMo-3 interface can reach 443 MPa,which meets the bonding performance requirement between wear-resistant parts and matrix under harsh conditions.
关键词
TiC钢结硬质合金/堆焊过渡层/界面Key words
TiC steel bonded carbide/surfacing transition layer/interface引用本文复制引用
基金项目
河南省科技攻关专项项目(222102230038)
出版年
2024
NETL
NSTL
万方数据