卷取温度对深冲DP钢组织性能及织构的影响

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。

Effect of hot-rolled coiling temperature on microstructure,properties and textures of micro-carbon deep-drawing DP steel

In order to study the charge rule of texture on deep-drawing DP steel,effect of hot-rolled coiling temperature on microstructure,properties and textures of micro-carbon deep drawing DP steel were studied by OM,TEM and XRD technical. The research shows that:microstructure of hot-rolled plates is mainly composed of ferrite and pearlite. With the increasing of coiling temperature,the grain size of ferrite increased slightly,and elongation of hot-rolled plate en-hanced gradually. The optimum precipitation temperature of Mo-based carbide in hot-rolled plate is 700℃. A higher vol-ume fraction (4%) of martensite and finer (11.7μm) ferrite observed in annealed sheet on 700℃coiling compared with 650 and 750 ℃. Meanwhile,the strongest〈111〉//ND fiber texture and weakest {001}〈110〉texture achieved in an-nealed sheet. The tensile strength and r value of annealed sheet on 700℃ coiling reach to 455 MPa and1.5,respectively.