GH4169合金Delta工艺中的变形行为和微观组织演变<sup>*</sup>

doi:10.11901/1005.3093.2013.841

材料研究学报

2014, Vol. 28

Issue (3): 211-219 DOI: 10.11901/1005.3093.2013.841

本期目录 | 过刊浏览

GH4169合金Delta工艺中的变形行为和微观组织演变^*

张海燕¹(

),张士宏²,程明²,赵忠¹

1. 宁波工程学院机械工程学院宁波 315016
2. 中国科学院金属研究所沈阳 110016

Deformation Behavior and Microstructure Evolution of GH4169 Alloy during the Delta Process

Haiyan ZHANG^1,^**(

),Shihong ZHANG²,Ming CHENG²,Zhong ZHAO¹

1. School of Mechanical Engineering, Ningbo University of Technology, Ningbo 315016
2. Institude of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

张海燕,张士宏,程明,赵忠. GH4169合金Delta工艺中的变形行为和微观组织演变^*[J]. 材料研究学报, 2014, 28(3): 211-219.
Haiyan ZHANG, Shihong ZHANG, Ming CHENG, Zhong ZHAO. Deformation Behavior and Microstructure Evolution of GH4169 Alloy during the Delta Process[J]. Chinese Journal of Materials Research, 2014, 28(3): 211-219.

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摘要:

在950-1010℃用GH4169合金的Delta工艺进行应变速率为0.005-0.1 s^-1的等温恒应变速率压缩实验, 系统研究了δ相对合金热变形行为和微观组织演变的影响。结果表明: 初始δ相含量分别为0、3.65%和8.14%的GH4169合金的真应力–真应变曲线均为具有单峰特征的曲线, 其本构方程均满足双曲正弦函数, 变形激活能分别为441.3、445.8和487.7 kJ/mol; 3种合金在热变形过程中的主要软化机制均为动态再结晶; 在相同变形条件下, 随着δ相含量的增加, 动态再结晶临界应变显著降低, 再结晶晶粒尺寸减小, 再结晶体积分数增大; 其中固溶态合金的再结晶形核方式主要为基体γ相的晶界弓弯形核, 而预析出δ相的合金中δ相与基体γ相的相界也是再结晶形核的有利位置。由此可见, δ相的存在能促进动态再结晶的发生。

关键词 ：金属材料, GH4169合金, Delta工艺, δ相, 变形行为, 微观组织

Abstract：

For the delta process (DP) of GH4169 high temperature alloy, the effect of d phase content on its hot deformation behavior and evolution of microstructures was studied systematically by isothermal compression test with a strain rate range 0.005-0.1 s^-1at temperature range 950-1010℃. The results indicated that the true stress–true strain curves for GH4169 alloys with different initial d phase contents of 0, 3.65% and 8.14% may be characterized with the feature of single peak curves, and the constitutive equation could be all expressed by a hyperbolic-sine Arrhenius-type equation. The corresponding activation energies of deformation were 441.3, 445.8 and 487.7 kJ/mol, respectively. The main soft mechanisms for GH4169 alloys with different initial d phase contents during hot working were all dynamic recrystallization (DRX). As the increase of δ phase content, the critical strain and grain size of DRX decreased, and the fraction of DRX increased. The DRX nucleation for the solution treated alloy might mainly rely on the bulging of original grain boundaries, while the boundaries between the d phase and matrix were the nucleation sites for DRX in the pre-precipitated GH4169 alloys. Thus, the existence of d phase can stimulate the occurrence of DRX.

Key words： metallic materials GH4169 alloy delta process δ phase deformation behavior microstructure

收稿日期: 2013-11-11

基金资助:* 浙江省自然科学基金LQ12E05001 和宁波市自然科学基金2011A610157 资助项目。

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图1 不同样品热压缩实验的微观组织

图2 变形温度为950℃时3种合金在不同应变速率下的真应力–真应变曲线

图3 不同合金热压缩变形时的ln[sinh(ασp)]与1/T之间的关系曲线

图4 3种合金在不同变形条件下变形后的微观组织

图5 3种合金在不同变形条件下的峰值应变

图6 3种合金在不同变形条件下的动态再结晶晶粒尺寸

图7 3 种合金在不同变形条件下的动态再结晶体积分数

图8 3种合金热变形中lnε0.5与lnZ, ln(-ln(1-X)/0.693)与ln((ε-εc)/ε0.5)的关系曲线

表1 GH4169合金的3种动态再结晶模型

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