The structure and mechanical properties of steel AISI 1045 subjected to three passes of the combined process “helical rolling–pressing” at a temperature of 500 °C were investigated. During the helical rolling–pressing process, the structure was substantially crushed to ultrafine-grained state, as the structure of steel AISI 1045 with an average grain size of 25 µm after deformation was decreased by 25 times, the average grain size was 1 µm. The values of tensile strength and yield strength increase in three passes from 619 to 925 MPa and from 545 to 867 MPa, respectively. The relative contraction after rupture varies from 42 to 35%; but the change is not as significant as in usual helical rolling. The combined helical rolling–pressing process is an effective way to form an ultrafine-grained structure and improve the mechanical properties of AISI 1045 steel.

中文翻译：

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螺旋轧制过程中AISI1045的结构和力学性能

研究了AISI 1045钢在500°C的温度下经过3次“螺旋轧制”组合过程的组织和力学性能。在螺旋轧制过程中，由于AISI 1045钢的变形后平均晶粒尺寸为25 µm，其组织减小了25倍，平均晶粒尺寸为1 µm，因此该组织基本上被粉碎成超细颗粒状态。在三个过程中，抗拉强度和屈服强度值分别从619到925 MPa和从545到867 MPa增加。破裂后的相对收缩从42％到35％不等；但是这种变化并不像通常的螺旋轧制那样重要。