脉冲电流下GH4169合金高温拉伸性能及动态再结晶的研究
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- 英文论文题名：Study on Tensile Property and Dynamic Recrystallization of GH4169 Alloy with Pulse Current at Elevated Temperatures
- 论文作者：苑丹 ; 王磊 ; 刘杨 ; 宋秀 ; 刘超
- 英文论文作者：Yuan Dan ; Wang Lei ; Liu Yang ; Song Xiu ; Liu Chao ; Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) ; Northeastern University
- 年：2015
- 作者机构：东北大学材料各向异性与织构教育部重点实验室;
- 论文关键词：脉冲电流 ; GH4169 ; 变形行为 ; 动态再结晶
- 英文论文关键词：pulse current ; GH4169 alloy ; deformation behaviors ; dynamic recrystallization
- 会议召开时间：2015-05-20
- 会议录名称：第十三届中国高温合金年会论文集
- 英文会议录名称：Proceedings of the 13th China Superalloys Conference
- 语种：中文
- 分类号：TG132.3
- 学会代码：ZGJS
- 会议名称：第十三届中国高温合金年会
- 会议地点：中国北京
- 主办单位：中国金属学会高温材料分会
- 学会名称：中国金属学会
- 页数：4
- 文件大小：2017k
- 原文格式：O
- 会议级别：全国
摘要
将脉冲电流引入GH4169合金的高温拉伸过程,研究了脉冲电流对合金高温变形行为及动态再结晶的影响规律及作用机理。结果表明脉冲电流的引入促进了γ″相的析出,当施加4kA/mm~2 10Hz 30μs电脉冲后合金屈服强度升高,变形抗力下降,延伸率降低。随脉冲电流密度增大,合金在屈服之后变形抗力的下降更为显著。脉冲电流能够降低原子跃迁的能量势垒,降低动态再结晶激活能,从而促进动态再结晶过程。
The pulse current is introduced into the high temperature tensile process of GH4169 alloy,mainly in order to investigate the effects of different pulse current on the high temperature deformation behavior and dynamic recrystaUization.The results show that the pulse current can promote the γ' phase precipitation.After applying electric pulses(4kA/mm~210Hz 30μs),the yield strength of the sample increases,the deformation resistance of alloy decreases,and the elongation decreases.With the pulse current density increases,the deformation resistance of alloy significantly decreases after the yielding.The process of entering into sub-boundaries for dislocations climb and the growth of boundaries angle gets promoted by pulse current,so the recrystaUization nucleation time is shortened.Meanwhile,the energy barrier of atoms transition and dynamic recrystaUization activation energy are also reduced by pulse current.
The pulse current is introduced into the high temperature tensile process of GH4169 alloy,mainly in order to investigate the effects of different pulse current on the high temperature deformation behavior and dynamic recrystaUization.The results show that the pulse current can promote the γ' phase precipitation.After applying electric pulses(4kA/mm~210Hz 30μs),the yield strength of the sample increases,the deformation resistance of alloy decreases,and the elongation decreases.With the pulse current density increases,the deformation resistance of alloy significantly decreases after the yielding.The process of entering into sub-boundaries for dislocations climb and the growth of boundaries angle gets promoted by pulse current,so the recrystaUization nucleation time is shortened.Meanwhile,the energy barrier of atoms transition and dynamic recrystaUization activation energy are also reduced by pulse current.
引文
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[2]陈国良.高温合金学[M].北京:冶金工业出版社,1988,1,151~213.
[3]曾燕屏,董建新,等.拉伸载荷下镍基粉末高温合金中夹杂物行为[J].北京科技大学学报,2005,27(2):202~204.
[4]曲敬龙,杜金辉,等.复合包套轧制工艺对难变形高温合金GH720Li组织的影响[J].材料科学与工艺,2008,16(1):121~124.
[5]Zhang J M,Gao Z Y,et al.Modeling of grain size in superalioy IN718 during hot deformation[J].Journal of Materials Processing Technology,1999,88(1~3):244~250.
[6]Troitskii O A.Pressure shaping by the application of a high energy[J].Material Science and Engineering:A,1985,75(1):37~50.
[7]刘宁.403Nb动态再结晶及热变形组织演变研究[D].昆明:昆明理工大学,2008.
[8]Conrad H,Karam N,et al.Effect of electric current pulses on the recrystallization kinetics of copper[J].Scripta Metallurgica,1988,22(2):235~238.
[9]周亦胄,肖素红,等.脉冲电流对冷加工黄铜的组织及性能的影响[J].材料研究学报,2002,16(4):375~378.
[10]刘志义,邓小铁,等.脉冲电流对2091铝锂合金动态再结晶动力学的影响[J].材料研究学报,2001,15(3):358~366.