锡青铜/10号钢复合板微观组织和界面结合机制研究

Microstructure and Interfacial Bonding Mechanism of Tin-bronze/1010 Steel Composite Plates

使用连续固-液复合的方法制备了锡青铜(Tin bronze,TB)/10号钢(1010 steel)双金属层状复合材料。通过金相显微镜、电子探针显微镜和透射电镜分析了复合材料的微观组织和界面结合机制。使用硬度和拉伸-剪切测试的方法分别研究了锡青铜/10号钢复合板的力学性能和界面结合强度。结果表明,复合板中锡青铜微观组织均匀,而钢由于冷却过程中复杂的温度场,形成了铁素体+珠光体+贝氏体的复杂微观组织。复合材料具有优异的界面结合性能,实现了界面的全冶金结合。TEM结果表明,在锡青铜和10号钢之间形成了牢固的原子间结合界面。拉伸-剪切测试结果表明,最终的断裂发生在锡青铜侧,界面的结合强度大于锡青铜的。

Tin bronze(TB)/1010 steel bimetal laminated composites were prepared using continuous solid-liquid bonding method.Microstructure and interfacial bonding mechanism of the composites were analyzed by optical micro⁃structure(OM),electron probe microanalysis(EPMA)and transmission electron microscope(TEM).The mechani⁃cal properties and interfacial bonding strength of composites were investigated by hardness and tensile-shear tests,respectively.The results indicate that microstructure of the tin-bronze is homogeneous,while a complex microstruc⁃ture of ferrite+pearlite+bainite are formed in steel due to the complex temperature field during the cooling process.The composites exhibit excellent interfacial bonding properties,realizing the completely metallurgical bonding.TEM results reveal that a strong interatomic bonding interface is generated between tin bronze and 1010 steel.The tensileshear test results demonstrate that the final fracture occurs on the tin-bronze side,and the bonding strength of the inter⁃face is higher than that of tin-bronze.