论文部分内容阅读
本文研究了预形变亚温淬火双相15钢的显微组织,力学性能特点和断裂行为。试验结果表明,采用适当的室温预形变与短时加热亚温淬火相结合的工艺,可使15钢获得马氏体与铁素体相间定向分布的复合组织,是发展高强度(σ_b≈100kg/mm~2,δ≈10%)铁素体——马氏体双相钢的有效方法之一。拉伸断口形貌随原始组织及预形变量的大小而有所不同。虽然在短时加热亚温淬火双相钢中铁素体和马氏体均可对钢的强度作出贡献,但实际参与形变和断裂过程的马氏体数量远小于定量金相分析所得结果,在利用混合律估算强度时应予以注意。
In this paper, the microstructure, mechanical properties and fracture behavior of pre-densified sub-tempered dual-phase 15 steel were studied. The results show that the combination of proper pre-deformation at room temperature and sub-temperature quenching with short-time heating can make the 15 steel obtain the composite structure with directional distribution of martensite and ferrite phase, which is to develop high strength (σ_b ≈ 100kg / mm ~ 2, δ≈10%) One of the effective methods of ferrite-martensite dual phase steel. Tensile fracture morphology with the original organization and the amount of pre-deformation vary. Although ferrite and martensite can both contribute to the strength of steel in the short-term heating of sub-tempered dual-phase steel, the amount of martensite actually involved in the deformation and fracture processes is much smaller than that obtained by quantitative metallographic analysis. Mixed law should pay attention when estimating the intensity.