卷取温度对热轧高强度搅拌罐用钢性能的影响

在实验室研究了不同卷取温度对C-Si-Mn-Al热轧高强度搅拌罐用钢组织性能的影响。采用激光共聚焦显微镜(LSCM)、扫描电子显微镜(SEM)、电子背散射衍射(EBSD)等技术对试验钢在不同卷取温度下的组织、力学性能进行对比研究。研究结果表明,试验钢在580、550 ℃卷取得到铁素体和珠光体组织;在400 ℃卷取得到铁素体和贝氏体组织;在300 ℃低温卷取得到铁素体、贝氏体和马氏体组织;在150 ℃低温卷取得到铁素体和马氏体组织。随着卷取温度的降低,试验钢的抗拉强度与硬度逐渐增大,伸长率逐渐降低。试验钢在300 ℃模拟卷取时抗拉强度达到1 029 MPa,维氏硬度为342.6;在150 ℃模拟卷取时抗拉强度高达1 265 MPa,维氏硬度达到360.7,屈强比达到最低,仅为0.58。

Influence of coiling temperature on properties of hot-rolled high strength steel used for mixing tank

The effects of different coiling temperatures on the microstructure and properties of C-Si-Mn-Al hot-rolled high strength steel used for mixing tank were studied in the laboratory. And the structure and mechanical properties of the tested steels at different coiling temperatures were analyzed and studied by several techniques such as laser scanning confocal microscope (LSCM), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). The experimental results showed that ferrite and pearlite were obtained by coiling at 580 and 550 ℃. Ferrite and bainite were obtained at 400 ℃. Ferrite, bainite and martensite were obtained at 300 ℃. And Ferrite and martensite were obtained at 150 ℃. As the coiling temperature decreased, the tensile strength and hardness of the tested steel gradually increased, and the elongation gradually decreased. The tensile strength of the tested steel coiled at 300 ℃ was 1 029 MPa and the Vickers hardness was 342.6. The tensile strength coiled at the 150 ℃ was as high as 1 265 MPa, the Vickers hardness reached 360.7, and the yield ratio reached the lowest, only 0.58.