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利用热变形与温变形相结合的复合形变热处理工艺对38MnVS非调质钢进行了处理,借助光学显微镜、扫描电镜、能谱仪、拉伸试验机、摆锤冲击试验机及显微硬度仪等对其组织结构及力学性能进行了表征。结果表明,当复合形变热处理工艺为1150~1200℃热变形(25%变形量)+650℃温变形(15%变形量)时,能够显著改善其组织结构,并有效增加珠光体团位错密度及形变强化效应,其显微组织主要为珠光体和沿晶界或晶内分布的均匀细小铁素体,抗拉强度、屈服强度和冲击吸收功(25℃)分别为935.8 MPa、625.5 MPa和11.8 J,相对于传统的控锻控冷工艺分别提升9.4%,12.5%和61.6%,且试样冲击断口具有解理断裂和微孔聚集型断裂混合特征。
38MnVS non-quenched and tempered steel was treated by composite deformation heat treatment combined with thermal deformation and temperature deformation. With optical microscope, scanning electron microscope, energy dispersive spectrometer, tensile tester, pendulum impact tester and microhardness tester Its organizational structure and mechanical properties were characterized. The results show that the composite structure can significantly improve the microstructure and increase the dislocation density of pearlite when the composite deformation heat treatment is conducted at 1150-1200 ℃ for thermal deformation (25% deformation) + 650 ℃ (15% deformation) And deformation strengthening effect. The main microstructure is pearlite and uniform fine ferrite distributed along grain boundaries or grains. The tensile strength, yield strength and impact absorption work (25 ℃) are 935.8 MPa, 625.5 MPa and 11.8 J, which is 9.4%, 12.5% and 61.6% higher than that of the conventional forgings controlled cooling process, respectively. The impact fracture of the specimen has the characteristics of cleavage fracture and micropore aggregation-type fracture.