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为研究深冲织构的演变规律,利用OM、TEM和XRD等技术研究了热轧卷取温度对微碳深冲DP钢组织、性能与织构的影响。结果表明,热轧板主要由铁素体+珠光体构成,随卷取温度升高,铁素体晶粒略增大,伸长率逐渐上升;热轧板中钼基碳化物的最佳析出温度为700℃;与650和750℃相比,700℃卷取后的退火板能获得较高体积分数(4.0%)马氏体与较细(11.7μm)铁素体的组织特征,同时拥有最强的〈111〉//ND纤维织构和最弱的{001}〈110〉织构,使得其抗拉强度达到455 MPa,塑性应变比r值达1.5。
In order to study the evolution of deep-drawn texture, the effects of hot-coiling temperature on the microstructure, properties and texture of micro-carbon deep-drawn DP steel were studied by means of OM, TEM and XRD. The results show that the hot-rolled sheet is mainly composed of ferrite and pearlite. With the increase of the coiling temperature, the ferrite grains slightly increase and the elongation increases gradually. The optimum precipitation of molybdenum-based carbides in the hot-rolled sheet The temperature is 700 ℃. Compared with 650 and 750 ℃, the annealed sheet after 700 ℃ coiling can obtain the microstructure characteristics of higher volume fraction (4.0%) martensite and finer (11.7μm) ferrite, The strongest <111> // ND fiber textures and the weakest {001} <110> textures result in a tensile strength of 455 MPa and a plastic strain ratio r of 1.5.