论文部分内容阅读
通过熔体过热处理方法,限定其它因素保持不变的情况下,研究了不同熔体过热温度对Cu-9Al-4Fe铝青铜合金(QAl9-4)的凝固组织及其高温力学性能的影响。结果表明:经熔体过热处理后的铝青铜合金凝固组织晶粒尺寸明显细化、形貌等轴化;高温超塑性能得到改善,800℃下初始最大拉伸屈服应力降低约28%,最大伸长率δ提高了约36%;600℃下其稳态蠕变速率和蠕变变形量明显降低,抗蠕变能力得到有效的提高。
The effects of different overheat temperatures on the microstructure and mechanical properties at high temperature of Cu-9Al-4Fe aluminum bronze alloy (QAl9-4) were studied by means of melt overheating treatment while other factors were kept unchanged. The results show that the solidified microstructure of the Al-bronze alloy after the melt overheating is obviously refined and the morphology is equiaxed. The superplasticity at high temperature is improved, the initial maximum tensile yield stress decreases by about 28% at 800 ℃, and the maximum The elongation δ is increased by about 36%. The steady creep rate and creep deformation at 600 ℃ are obviously decreased, and the creep resistance is effectively improved.