Nb-Ti微合金化热冲压成形用钢的微观组织与力学性能
发布时间：2019-01-05 21:14
【摘要】：利用扫描电镜(SEM)、透射电镜(TEM)对Nb-Ti微合金化热成形钢的微观组织进行观察,采用Kahn撕裂试验对其韧性和撕裂性能进行了研究,并利用Thermo-Calc热力学软件对其析出行为和析出粒子成分进行分析计算.结果表明,含碳质量分数0.13%的热成形钢在Nb-Ti微合金化后的组织为马氏体,和传统热成形钢(22MnB5)相比其奥氏体晶粒、板条块和板条束都得到细化,并且其抗拉强度达到1500 MPa以上,撕裂强度和单位面积裂纹扩展能分别达到1878 MPa、436 kN·m~(-1).在950℃奥氏体化时,Nb-Ti合金元素几乎全部以析出粒子形式存在,能有效阻止奥氏体晶粒长大.另外在基体中主要存在两种析出物,一种是尺寸在100~200 nm的Ti(C,N);另一种是纳米级别的钛铌复合碳氮化物,能有效强化基体,提高强度.
[Abstract]:The microstructure of Nb-Ti microalloyed hot formed steel was observed by scanning electron microscope (SEM),) transmission electron microscope (TEM). The toughness and tear properties of Nb-Ti microalloyed hot formed steel were studied by Kahn tear test. The precipitation behavior and the composition of precipitated particles were analyzed and calculated by Thermo-Calc thermodynamics software. The results show that the microstructure of hot forming steel with 0.13% carbon content is martensite after Nb-Ti microalloying. Compared with traditional hot forming steel (22MnB5), the austenite grain of hot formed steel is refined. The tensile strength is more than 1500 MPa, and the tear strength and crack growth energy per unit area are 1878 MPa,436 kN m-1, respectively. At 950 鈩，
本文编号：2402316
[Abstract]:The microstructure of Nb-Ti microalloyed hot formed steel was observed by scanning electron microscope (SEM),) transmission electron microscope (TEM). The toughness and tear properties of Nb-Ti microalloyed hot formed steel were studied by Kahn tear test. The precipitation behavior and the composition of precipitated particles were analyzed and calculated by Thermo-Calc thermodynamics software. The results show that the microstructure of hot forming steel with 0.13% carbon content is martensite after Nb-Ti microalloying. Compared with traditional hot forming steel (22MnB5), the austenite grain of hot formed steel is refined. The tensile strength is more than 1500 MPa, and the tear strength and crack growth energy per unit area are 1878 MPa,436 kN m-1, respectively. At 950 鈩，
本文编号：2402316
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