GH4169G合金高应变速率超塑性研究
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- 英文论文题名：The High Strain Rate Superplasticity of GH4169G Superalloy
- 论文作者：黄林杰 ; 祁峰 ; 张安文 ; 孙文儒 ; 胡壮麒
- 英文论文作者：Huang Linjie ; Qi Feng ; Zhang Anwen ; Sun Wenru ; Hu Zhuangqi ; Institute of Metal Research ; Chinese Academy of Sciences
- 年：2015
- 作者机构：中国科学院金属研究所高温合金部;
- 论文关键词：GH4169G ; 超塑性 ; 高应变速率 ; 再结晶 ; 孪晶
- 英文论文关键词：GH4169G ; superplasticity ; high strain rate ; dynamic recrystallization ; twinning
- 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：1455k
- 原文格式：O
- 会议级别：全国
摘要
本文研究了细晶GH4169G合金在高应变速率下的超塑性及其超塑性变形机理。合金在950℃,5×10~(-2)~4×10~(-1)s~(-1)的高应变速率条件下表现出超塑性,最高伸长率为175%。靠近断口处出现了较多直线型的空洞,是由于碳化物对变形的阻碍引起的;颈缩的发生是合金断裂的主要方式,同时,颈缩的发生对合金的总伸长率做出了主要贡献。在高应变速率下,GH4169G超塑形变形是以动态再结晶为主,孪晶变形起了重要的协调作用。
The high strain rate superplasticity has drawn much attention due to the limitation of the low strain rate of conventional superplastic forming to the industrial productivity.In this paper,the high strain rate superplastic deformation of GH4169 G and its deformation mechanism have been studied at 950℃ and the strain rates of 5×10~(-2)-4×10~(-1)s~(-1),the elongation of which peaked an value of 175%at 5×10~(-2) s~(-1).The cavitation is closely related to the MC carbide and the necking dominates the failure.It is deemed that the superplasticity mechanism of GH4169 G is based on the dynamic recrystallization accommodated by the twinning.
The high strain rate superplasticity has drawn much attention due to the limitation of the low strain rate of conventional superplastic forming to the industrial productivity.In this paper,the high strain rate superplastic deformation of GH4169 G and its deformation mechanism have been studied at 950℃ and the strain rates of 5×10~(-2)-4×10~(-1)s~(-1),the elongation of which peaked an value of 175%at 5×10~(-2) s~(-1).The cavitation is closely related to the MC carbide and the necking dominates the failure.It is deemed that the superplasticity mechanism of GH4169 G is based on the dynamic recrystallization accommodated by the twinning.
引文
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[2]Yang Q,Xiao B L,et al.Achieving high strain rate superplasticity in Mg-Zn-Y-Zr alloy produced by friction stir processing.Scripta Materialia[J].2011,65(4):335~338.
[3]Mohan A,Yuan W,et al.High strain rate superplasticity in friction stir processed ultrafine grained Mg-Al-Zn alloys.Materials Science and Engineering:A[J].2013,562:69~76.
[4]Alhamidi A,Horita Z.Grain refinement and high strain rate superplasticity in alumunium 2024 alloy processed by high-pressure torsion.Materials Science and Engineering:A[J].2015,622:139~145.
[5]胡壮麒,孙文儒,等.一种新的变形高温合金强化方法——磷硼微合金复合强化.中国工程科学[J].2005,7(3):17~26.
[6]胡壮麒,孙文儒,等.微量元素磷在铁镍基变形高温合金中的作用.中国有色金属学报[J].2001,11(6):947~959.
[7]Huang L,Qi F,et al.The superplastic deformation mechanism of inconel 718 superalloy;the discontinuous dynamic recrystallization[J].Metallurgical and Materials Transactions A,2015,in preparation.
[8]Huang L,Qi F,et al.Necking behavior and microstructural evolution during high strain rate superplastic deformation of IN718 superalloy[J].Materials Science and Engineering:A,2015,In press,DOI;http://dx.doi.org/10.1016/j.mesa 2015.03.031.
[9]Smith G D,Yates D H,et al.Microstructural and mechanical property characterization of superplastically formed INCONEL alloy 718 SPF[J].Superalloys,1992:83-92.
[10]Chan K C,Wang G F,et al.Low temperature and high strain rate superplasticity of the electrodeposited Ni/Si3 N4(W)composite[J].Scripta Materialia,2005,53(11):1285~1290.
[11]Zhu Y T,Liao X Z,et al.Deformation twinning in nanocrystalline materials[J].Progress in Materials Science,2012,57(1):1~62.