论文部分内容阅读
研究了冷拔减面率以及时效处理对一种贝氏体型冷作强化非调质钢组织和力学性能的影响,并采用该钢试制10.9级U形螺栓。研究结果表明,随着冷拔减面率的增加,材料的强度开始时显著增加,当冷拔减面率为26%时,抗拉强度达到最大值1 134MPa,这是由于当减面率达到26%时,应变硬化指数n值达到峰值。100~500℃时效处理后,该钢的强度先增加后减小,在300℃时效处理后抗拉强度和屈服强度分别达到峰值,原因是由于碳化物在不同时效温度下析出行为的变化导致材料强度的变化,300℃时效碳化物析出尺寸细小且密度大,因此强度高。由研究结果制定最优工艺,试制的螺栓其性能满足卡车10.9级U形螺栓的要求,可以实现工业生产。
The effects of cold drawing reduction rate and aging treatment on the microstructure and mechanical properties of a bainitic cold-worked non-quenched and tempered steel were studied. The 10.9-grade U bolt was made from this steel. The results show that with the increase of drawing reduction rate, the strength of the material increases significantly at the beginning, when the drawing reduction of 26%, the tensile strength reaches a maximum of 1 134MPa, which is because when the reduction rate reaches At 26%, the strain hardening index n peaked. After aging at 100-500 ℃, the strength of the steel first increases and then decreases. After aging at 300 ℃, the tensile strength and yield strength reach their peak values respectively. The reason is that the variation of the precipitation behavior of carbides at different aging temperatures results in that the material Strength changes, 300 ℃ aging carbide precipitation size small and high density, high strength. From the research results to develop the best technology, the trial of the bolt to meet the performance of the truck 10.9 U-bolt requirements, industrial production can be achieved.