Abstract: The analysis shows that cracking of steel ML08A1 rivets with non-standard special-shaped fasteners is mainly caused rivet flanging by the high original strength and the poor plastic shape of the material. By optimizing the composition control in the range of 0. 04% ~0. 06% C, ≤0. 05% Si, 0.30% ~ 0.35% Mn, decreasing Ti content from 0. 021% to 0. 001% and the [N] in the smelting process control less than 30 x 10^-6, the yield strength of steel decreases from 260 - 264 MPa to 219 - 226 MPa and the work hardening rate of the material can be effectively reduced, to obtain a higher plastic strain capacity and ensure the quality requirements of rivet deep processing, 100 tons of rivet cracking rate from the original 8% reduces to about 0. 33%.

摘要： 分析表明非标异型紧固件ML08A1钢铆钉开裂由于材料原始屈服强度偏高、材料塑性差是造成铆钉翻边开裂的主要原因。通过优化成分控制在0.04%~0.06%C、≤0.05% Si、0.30%~0.35% Mn,Ti 含量由0.021%降至0.001%,冶炼过程[N]控制小于30 ×10^-6,使屈服强度由260~264 MPa降至219~226 MPa,降低材料加工硬化率,获得更高的塑性应变能力,保证铆钉深加工质量要求,百吨铆钉开裂率由原来的8%降低至0.33%左右。

关键词: ML08Al钢, 非标异型紧固件, 铆钉开裂, 力学性能, 材料塑性