|
摘要：
|
|
通过热模锻造技术对GH4133A合金分别进行10%和30%的三火镦粗试验,探索了晶粒度随变形火次的变化规律、变形量对变形机制的影响。结果表明:当以10%变形量锻造时,无论是在1080℃还是在1160℃锻造,晶粒都是随火次增大逐步细化的。而以30%变形量锻造时,二火即累计变形60%时晶粒细化效果最显著,三火时晶粒细化效果不及二火。1160℃时细化效果不及1080℃。GH4133A合金在热模低速条件下是以滑移→孪晶→滑移方式或孪晶→滑移→孪晶→滑移方式进行变形的,且变形温度接近锻造温度区间下部时,多火次小变形同样能细化晶粒。
|
|
Deformation of 10% and 30% three-heating upset was carried out on GH4133A superalloy by hot-die forging,and the rule that grain size changed with heating numbers and the influence of deformation on its mechanism were studied.The results show that when hot-die forging is carried out with 10% deformation,either at 1080 ℃ or 1160 ℃,the grain size is decreased gradually as heating numbers increasing.And when the deformation is 30%,the grain size gets thinnest up to 60% deformation at the second heating,but it increases at the third heating.The effect of refining grains at 1160 ℃ is not obvious compared with 1080 ℃.GH4133A's deformation track is slipping→twin→slipping or twin→slipping→twin→slipping during low speed hot-die forging,and grain refinement is also obtained by multiple heating saddening when deformation temperature is close to the low limit of forging temperature.
|
|
基金项目：
|
|
|
|
作者简介：
|
|
|
|
参考文献：
|
[1]师昌绪,李恒德,周廉.材料科学与工程手册(上卷-第6篇)[M].北京:化学工业出版社,2004.
[2]Elihu F Bradly.Super Alloys:A Technical Guide[M].Ohi-o:ASM International,1988.
[3]张北江,赵光晋,焦兰英,等.热加工工艺对GH4568合金微观组织的影响[J].金属学报,2005,41(4):351-356.
[4]Park N K,Kim I S,Na Y S,et al.Hot forging of a nickel-base superalloy[J].Journal of Materials Processing Tech-nology,2001,111(1):98-102.
[5]Medeiros S C,Prasad Y V R K,Frazier W G,et al.Micro-structural modeling of metadynamic recrystallization in hotworking of IN 718 superalloy[J].Materials Science and En-gineering A,2000,293(1):198-207.
[6]王乐安.难变形合金锻件生产技术[M].北京:国防工业出版社,2005.
[7]毛为民,赵新兵.金属的再结晶与晶粒长大[M].北京:冶金工业出版社,1994.
[8]吴泽,姚泽坤,郭鸿镇,等.700℃~800℃温度下GH4169合金的组织演化和力学性能研究[J].锻压技术,2007,32(2):90-93.
|
|
服务与反馈：
|
|
【文章下载】【加入收藏】
|
|
|
|
