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材料研究学报  2018, Vol. 32 Issue (9): 647-654    DOI: 10.11901/1005.3093.2017.524
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γ' 相的形貌对Ni-Co基高温合金Portevin-Le Chatelier效应的影响
张国梁1, 王新广1, 王道红2, 李志海2, 严红彬2, 崔传勇1()
1 中国科学院金属研究所 沈阳 110016
2 江苏飞跃机泵集团有限公司 泰州 225300
Influence of the γ' -phase Morphology on Portevin-Le Chatelier Effect in a Ni-Co Base Superalloy
Guoliang ZHANG1, Xinguang WANG1, Daohong WANG2, Zhihai LI2, Hongbin YAN2, Chuanyong CUI1()
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 Jiangsu Feiyue Pump Group Co. Ltd, Taizhou 225300, China
引用本文:

张国梁, 王新广, 王道红, 李志海, 严红彬, 崔传勇. γ' 相的形貌对Ni-Co基高温合金Portevin-Le Chatelier效应的影响[J]. 材料研究学报, 2018, 32(9): 647-654.
Guoliang ZHANG, Xinguang WANG, Daohong WANG, Zhihai LI, Hongbin YAN, Chuanyong CUI. Influence of the γ' -phase Morphology on Portevin-Le Chatelier Effect in a Ni-Co Base Superalloy[J]. Chinese Journal of Materials Research, 2018, 32(9): 647-654.

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摘要: 

通过不同的热处理工艺制备含花状、球状、立方状γ'相的Ni-Co基变形高温合金,研究了γ'相的形貌对其PLC效应的影响。结果表明:合金的PLC效应与γ'相的形貌有关。球状形貌的γ'相使合金的应力跌幅较大,花状和立方状形貌的γ'相使合金更快完成从正常PLC到反常PLC的转变。合金在中低温(400℃、500℃)拉伸时位错易塞积在复杂形貌(花状和立方)的γ'相周围,合金的变形机制以形成层错或微孪晶为主;而在球状形貌γ'相的周围位错塞积较少,合金的变形机制则以位错滑移为主。

关键词 金属材料PLC效应γ'相形貌;Ni-Co基变形高温合金    
Abstract

A Ni-Co based alloy with γ' -phase of various morphologies was prepared by different heat treatment processes. Then the influence of the γ' -phase on the Portevin-Le Chatelier (PLC) effect was investigated systematically. Results show that the PLC effect is related to the morphology of the γ' -phase. During tensile test the alloy shows large stress drop while the spherical-shaped γ' -phase existed. The γ' -phase with flowery and cubic morphology would accelerate the transformation from normal PLC to inverse PLC. When the alloy was tensile tested in medium-low temperatures (400, 500°C) the dislocations would pile up around the γ' -phase with flowery and cubic morphology, and the deformation mechanism of the alloy may be described mainly to stacking fault or deformation twin. While less dislocation piled up around the spherical-shaped γ' -phase, therefore, the deformation of the alloy is mainly controlled by the dislocation slip.

Key wordsmetallic materials    PLC effect    γ' morphology;    Ni-Co based superalloys
收稿日期: 2017-09-05     
ZTFLH:  TG171  
基金资助:中国高新技术研究与发展规划(2014AA041701)和国家自然科学基金(51671189, 51331005, 11332010)
作者简介:

作者简介 张国梁,男,1990年生,硕士生

图1  不同γ’相形貌合金的SEM照片
图2  在不同温度下Ni-Co基合金的拉伸真应力-真应变曲线
图3  γ’相形貌不同的Ni-Co基合金的力学性能随着温度和应变速率的变化
图4  在500℃拉伸时不同γ’相形貌合金的临界应变随着应变速率的变化
图5  γ’相的形貌对PLC效应锯齿类型的影响
图6  γ’相的形貌和温度对合金发生PLC效应应力跌幅的影响
图7  不同γ’相形貌的样品拉伸实验后的TEM照片
图8  立方状γ’相样品在750℃拉伸后的TEM照片
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