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研究了不同压下率热轧304L/Q235B复合板的复合界面的显微组织以及成分分布、剪切强度、显微硬度变化。结果表明,热轧不锈钢复合板复合界面由于C、Cr元素扩散,复合界面附近形成一定厚度的扩散层,且由于有碳化物的形成,扩散层的硬度增加,黑色带状区域为扩散层的一部分,在该区域边界,硬度达到峰值。复合界面处有黑色夹杂物形成,成分为Mn的硫化物和氧化物。碳钢侧组织为铁素体和珠光体,且随压下率增加,珠光体体积分数增加。在碳钢侧有脱碳层形成,随压下率增加,脱碳层厚度减小。复合板剪切强度随道次压下率的增加有所增加,并且剪切断口同时存在韧性断裂区域和脆性断裂区域,断裂发生在复合界面处。
The microstructure, composition distribution, shear strength and microhardness of 304L / Q235B composite plates with different reduction rates were studied. The results show that due to the formation of carbides, the hardness of the diffusion layer increases due to the diffusion of C and Cr elements at the composite interface of the hot-rolled stainless steel clad plate, forming a certain thickness of the diffusion layer near the composite interface. The black stripe region is a part of the diffusion layer At the boundaries of the region, the hardness peaked. Composite interface at the formation of black inclusions, the composition of Mn sulfide and oxides. Carbon steel side of the organization of ferrite and pearlite, and with the reduction rate increases, pearlite volume fraction increases. In the carbon steel side decarburization layer formation, with the reduction rate increases, decarburization layer thickness decreases. The shear strength of the composite plate increases with the increase of the pass reduction rate, and the shear fracture exists in both the ductile fracture zone and the brittle fracture zone, and the fracture occurs at the composite interface.