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通过在830℃空气中保温1 h后水冷的热处理工艺,在Ti-10V-2Fe-3Al(Ti1023)钛合金表面形成厚度约为82μm的α富氧复合层。研究了α复合层内显微组织形貌、硬度及元素分布特点及复合α层后对Ti1023合金组织和性能影响。结果表明:α复合层从边缘到基体内部硬度值并非一直减小,而是呈现高-低-高-低-趋于稳定的变化规律。研究表明硬度变化规律与合金元素(尤其V、Fe)及组织形态分布相关。Ti1023合金试样复合α层后表面硬度增加了45%,而屈服强度和抗拉强度下降5%。在拉伸变形过程中,复合α层后试样首先会在垂直于拉伸应力方向的外表面产生裂纹,之后裂纹扩展穿过α层到基体内部直至试样断裂,试样拉伸断口呈现心部韧性断裂和边部脆性断裂特征。拉伸过程中试样内部存在应力诱发β相向α″相的组织转变。
The α-oxygen-rich composite layer with a thickness of about 82 μm was formed on the surface of Ti-10V-2Fe-3Al (Ti1023) titanium alloy by a heat-treatment process of water-cooling in air at 830 ° C for 1 hour. The morphology, hardness and elemental distribution of the microstructure in the α composite layer and the effect of the composite α layer on the microstructure and properties of the Ti1023 alloy were investigated. The results show that the hardness of the α composite layer from the edge to the inside of the matrix does not decrease all the time, but presents a high-low-high-low-stability trend. The results show that the variation of hardness is related to the alloying elements (especially V, Fe) and the distribution of microstructure. The surface hardness of the Ti1023 alloy increases by 45% after compounding the α layer, while the yield strength and tensile strength decrease by 5%. In the tensile deformation process, the composite α layer after the first specimen will be perpendicular to the direction of tensile stress cracks on the outer surface, and then crack through the α layer to the inside of the matrix until the specimen rupture, specimen tensile fracture showed heart Department of ductile fracture and brittle fracture edge characteristics. Tensile process within the sample stress-induced β phase α "phase of the organization.