Interfacial microstructure and properties of steel bonded cemented carbide/Q235 steel by vacuum fusion
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摘要: 采用真空熔结工艺制备了TiC钢结硬质合金/Q235钢复合板，研究了复合板界面显微组织和力学性能。结果表明：钢结硬质合金与Q235钢基体之间形成了一定宽度的互溶区，互溶区宽度主要取决于熔结温度和熔结时间。Mn、Ni、Mo元素由钢结硬质合金经互溶区向基体中扩散，Fe元素由基体通过互溶区向钢结硬质合金扩散。互溶区是材料显微组织、化学成分及显微硬度变化的过渡区。复合板界面剪切强度为176～245 MPa，表明钢结硬质合金与Q235钢基体之间形成冶金结合。Abstract: The composite plates of TiC-based steel bonded cemented carbides and Q235 steels were prepared by vacuum fusion. The interfacial microstructure and mechanical properties of the composite plates were investigated. The results show that, there is a certain width mutual dissolution zone between the steel bonded cemented carbides and Q235 steel matrix, and the width of the mutual dissolution zone depends on the fusion temperature and fusion time. Mn, Ni, and Mo elements diffuse from the steel bonded cemented carbides to the matrix through the mutual dissolution zone, and Fe element diffuses from the matrix to the steel bonded cemented carbides through the mutual dissolution zone. The mutual dissolution zone is the transition zone of microstructure, chemical composition, and microhardness. The shear strength of the composite plate interface is 176~245 MPa, indicating that the metallurgical bonding between the steel bonded cemented carbides and Q235 steels matrix is formed.
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图 1 钢结硬质合金/Q235钢复合板示意图：（a）钢结硬质合金放置位置（熔结前）；（b）金相取样位置（熔结后）
Figure 1. Schematic diagram of the steel bonded cemented carbide and Q235 steel composite plates: (a) placement locations of the steel bonded cemented carbides (before fusion); (b) sampling points of the metallographic sampls (after fusion)
图 2 显微组织观察位置：（a）界面1；（b）界面2；（c）界面3和界面4
Figure 2. Observation position of the microstructures: (a) interface 1; (b) interface 2; (c) interface 3 and interface 4
图 4 复合板宏观形貌：（a）宏观形貌；（b）界面1；（c）界面2；（d）界面3和界面4
Figure 4. Macromorphology of the composite plates: (a) macromorphology; (b) interface 1; (c) interface 2; (c) interface 3 and interface 4
图 5 界面1显微组织：（a）～（c）界面显微组织；（d）～（e）钢结硬质合金显微组织
Figure 5. Microstructures of the interface 1: (a)~(c) the interfacial microstructures; (d)~(e) the microstructures of steel-bonded cemented carbides
图 8 界面3（（a）、（c）、（d））和界面4（（b）、（e）、（f））显微组织
Figure 8. Microstructures of the interface 3 ((a), (c), (d)) and the interface 4 ((b), (e), (f))
图 12 复合板界面处显微硬度分布：（a）界面1；（b）界面2；（c）界面3
Figure 12. Microhardness distribution of the composite plates: (a) interface 1; (b) interface 2; (c) interface 3
表 1 钢结硬质合金化学成分（质量分数）
Table 1. Chemical composition of the steel bonded cemented carbides
% TiC C Mn Ni Mo Fe 50～58 0.8～2.1 8～10 1～3 0.6～3.0 余量 
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元素 A B C D E F Fe 52.3046 65.7974 75.0251 90.9639 93.7813 97.4950 Ti 34.4689 25.1755 16.0481 1.2048 0 0 C 9.6192 4.9147 4.8144 3.0121 2.8084 2.4048 Mn 1.7034 2.7081 3.3099 4.0543 2.7585 0 Ni 0.9018 0.7021 0.6018 0.5786 0.5014 0 Mo 1.0020 0.7021 0.2006 0.1864 0.1503 0.1002
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