锻造工艺对A800F非调质钢组织与性能的影响
Effect of Forging Technique on Microstructure and Properties of A800F Non-Quenched and Tempered Steel
华小珍1，周浪1，唐新民2，惠卫军3，周贤良1
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作者单位：(1. 南昌航空大学 材料科学与工程学院，江西 南昌 330063；2. 江铃汽车股份有限公司，江西 南昌 330001；3. 钢铁研究总院，北京 100081)
中文关键字：非调质钢；锻造工艺；组织和性能；转向节
英文关键字：non-quenched and tempered steel；forging technique；microstructure and properties；steering knuckle
中文摘要：本文研究了不同的终锻温度、锻造比及冷却工艺对转向节和连杆锻件组织和性能的影响。结果表明，随着终锻温度下降，晶粒逐渐细化，铁素体组织逐渐增多，抗拉强度及屈服强度逐渐下降，冲击韧性逐渐增加；随着锻造比的增加，铁素体的含量逐渐增多，晶粒尺寸逐渐变小，冲击韧性逐渐增大，抗拉强度呈先增加后稳定的变化趋势；随着冷速的加快，晶粒尺寸逐渐变小，铁素体的含量逐渐增多，冷速对抗拉强度和屈服强度影响则不大。用A800F替代40Cr生产转向节等锻件是可行的，其最佳锻造工艺为：终锻温度为950℃～1050℃，锻造比为10～15，冷却方式为空冷。
英文摘要：The influence of various forging-ending temperature，forging ratio and cooling processes on microstructure and properties of the forge piece of steering knuckle and connecting rod were studied. The results show that the crystal size becomes finer，the structure of ferrite improves，the tensile strength and yield strength decreases and the impact toughness increases with the decrease of forging-ending temperature；The amount of ferrite increases，the grain size refines，the impact toughness improves and the tensile strength increases firstly and then steady-state as the increase of forging ratio；With increasing of cooling speed，the extents of fining grain intensify，however，the influence of cooling speed on the strength is little. it is feasible to use A800F steel instead of 40Cr to product steering knuckle and other forge pieces. When finishing forging temperature at the range of 950℃～1050℃，forging ratio at the extent of 10～15，and cooling process is air cooling，the best forging technique can be obtained.