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采用旋转弯曲疲劳试验探索了一种高钒(0.28%)中碳铁素体+珠光体型锻态非调质钢37MnSiVS的高周疲劳性能,并与传统低钒(0.12%)非调质钢38MnVS进行了对比。结果表明,37MnSiVS钢的疲劳极限及疲劳极限与抗拉强度的比值均明显高于38MnVS钢及调质钢40Cr,分别为562 MPa和0.614。增加钢中V,所形成的大量细小弥散V(C,N)质点与铁素体间具有特定的位向关系,有显著的析出强化和组织细化作用,使37MnSiVS钢微观组织均匀细小,铁素体硬度明显增加,珠光体与铁素体的显微硬度比减小,从而呈现出十分优异的高周疲劳性能。
The high cycle fatigue behavior of 37MnSiVS ferritic and pearlite as-quenched and tempered steel 37MnSiVS with high vanadium (0.28%) was explored by rotating bending fatigue test. Compared with traditional low vanadium (0.12%) non-quenched and tempered steel 38MnVS Made a contrast. The results show that the fatigue limit, fatigue limit and tensile strength ratio of 37MnSiVS steel are obviously higher than that of 38MnVS steel and quenched and tempered steel 40Cr, respectively 562 MPa and 0.614. A large number of small dispersed V (C, N) particles formed in the steel have a specific orientation relationship with the ferrite and have significant precipitation strengthening and microstructure refinement. The microstructure of the 37MnSiVS steel is uniform and fine. The iron Significantly increased the hardness of the body, pearlite and ferrite microhardness ratio decreases, showing a very good high cycle fatigue properties.