【摘要】 通过摸索GH4500合金静态再结晶温度范围并参考该合金的热加工塑性曲线,研究了热加工工艺参数对GH4500合金高倍组织的影响。试验结果显示,该合金采用1170~1180℃加热,终轧温度≥1100℃,变形量为>45%时的热加工工艺进行轧制可以获得均匀细小的高倍组织;当采用1050℃加热,变形量<10%时热加工后的高倍组织较变形前无变化,但合金变形后经1120℃*2h空冷+1080℃*4h空冷+845℃*24h空冷+760℃*16h空冷热处理后,晶粒度急剧长大,且晶粒形貌较差,晶界不完整。此外,在保证温度和变形量的前提下,适当延长保温时间对合金的晶粒度影响不大。更多还原

【Abstract】 The effect of thermal processing parameters on the microstructure of GH4500 alloy was investigated in this paper by testing and researching the static recrystalization temperature range and by referencing to the thermal processing plasticity curve of this alloy. Test results show that: An uniform and fine microstructure can be achieved if heating temperature was controlled within 1170~1180℃, end rolling temperature ≥1100℃, and amount of deformation >45%; while the microstructure of the alloy was not changed compared with that before thermal processing if heating temperature was controlled within 1000 ~ 1100℃, and amount of deformation < 10%, but the grain size grows dramatically, with a bad grain shape and unclear grain boundary after heat treated by 1120℃*2h air cooling +1080℃*4h air cooling +845℃*24h air cooling +760℃*16h air cooling. Furthermore, extending the holding time had a little influence on the grain size of the alloy, provided that the heating temperature and deformation extent were assured.更多还原