摘要
本文研究了7715D钛合金固溶后在四种不同的冷速（水淬、风冷、空冷和炉冷）对室温拉伸和冲击性能的影响。结果表明,随着固溶后冷速的增加,材料的屈服强度增加而塑性降低。水淬冲击韧性最低,炉冷次之,风冷较好,空冷最高。屈服强度受次生α相尺寸和数量的影响。塑性和冲击韧性受初生/等轴α界面密度、次生α相含量和尺寸影响。风冷和空冷时,初生α相界面减少和次生α相片层厚度增加（较水淬）引起的裂纹偏转是冲击韧性增加的主要原因。冲击韧性与屈服强度及塑性在一定条件下有相关性。
In this study, the influence of cooling rate（water quenching, fan cooling, air cooling and furnace cooling） after solid solution treatment on the room temperature tensile and Charpy impact properties of 7715 D titanium alloy were studied. It was found that the yield strength of the material increases with the increase of the cooling rate. The impact toughness increases in the order of water quenching, furnace cooling, fan cooling and air cooling. The yield strength is affected by the size and number of the secondary alpha phase. The ductility and impact toughness are affected by the interface density of primary alpha phase, the content and size of the secondary alpha phase. In the air cooling and air cooling conditions, the decrease of the primary alpha interfaces and the increase of the thickness of the secondary alpha are responsible for the increase of impact toughness. There is a correlation between impact toughness and yield strength and ductility under certain conditions.
出处
《世界有色金属》
2016年第6期165-167,169,共4页
World Nonferrous Metals
关键词
7715D钛合金
冷速
强度
塑性
冲击韧性
7715D titanium alloy
cooling rate
yield strength
ductility
impact toughness
