冷变形对GH3535合金的组织和力学行为的影响<sup>*</sup>

doi:10.11901/1005.3093.2014.617

材料研究学报

2015, Vol. 29

Issue (6): 439-444 DOI: 10.11901/1005.3093.2014.617

本期目录 | 过刊浏览

冷变形对GH3535合金的组织和力学行为的影响^*

范金辉¹,陈克信^1,^2,³,梁建平^2,³(

),李志军^2,³,李肖科^2,³

1. 东华大学机械工程学院上海 201620
2. 中国科学院上海应用物理研究所上海 201800
3. 中国科学院核辐射与核能技术重点实验室上海 201800

Effect of Cold Deformation on Microstructure and Mechanical Behavior of Ni-based High Temperature Alloy GH3535

Jinhui FAN¹,Kexin CHEN^1,^2,³,Jianping LIANG^2,^3,^**(

),Zhijun LI^2,³,Xiaoke LI^2,³

1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800, China
3. Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences,

引用本文:

范金辉,陈克信,梁建平,李志军,李肖科. 冷变形对GH3535合金的组织和力学行为的影响^*[J]. 材料研究学报, 2015, 29(6): 439-444.
Jinhui FAN, Kexin CHEN, Jianping LIANG, Zhijun LI, Xiaoke LI. Effect of Cold Deformation on Microstructure and Mechanical Behavior of Ni-based High Temperature Alloy GH3535[J]. Chinese Journal of Materials Research, 2015, 29(6): 439-444.

全文: PDF(4110 KB) HTML

摘要:

对GH3535合金进行不同变形量的拉伸, 研究了冷变形对GH3535合金力学性能的影响, 用OM、TEM对冷变形后的组织结构进行观察并结合真应力-真应变曲线分析了GH3535合金加工硬化的变形机制。结果表明, GH3535合金具有显著的加工硬化特性, 冷变形使其强度和硬度提高, 但是塑性降低; 随着变形量的增大晶粒沿着变形方向伸长, 孪晶变多且更粗大。GH3535合金的加工硬化规律遵循Ludwigson模型, 随着冷变形量的增大GH3535合金的加工硬化指数降低, 变形机制由单滑移和孪生逐渐变成交滑移和孪生。当变形量小于30%时加工硬化主要是位错的长程应力场和孪晶引起的, 当变形量大于30%时主要是位错的短程应力场和形变孪晶引起的。

关键词 ：金属材料, 镍基高温合金, 冷变形, 组织, 力学性能

Abstract：

The effect of extensometer induced cold-tesile deformation on microstructure and mechanical properties of Ni-based high temperature alloy GH3535 were investigated by means of OM and TEM as well as measurement of true stress-true stain curves. It was found that GH3535 alloy shows characteristics of strong work hardening; cold deformation can result in significant increase of its strength and hardness, whereas decrease of its ductility. With the increase of deformation degree grains were elongated along the deformation direction and twins became profusely lager. The work hardening kinetics of GH3535 alloy is constant with Ludwigson model, dislocation slipping and twin are the main deformation mechanism. With the increase of deformation degree the slip behavior of dislocations changes from single slip to cross slip. When the deformation degree below 30% the work hardening is mainly caused by the dislocation long-range stress field and twin, conversely, for the deformation degree above 30% work hardening is mainly caused by the dislocation short-range stress field and deformation twin.

Key words： metallic materials nickel-based superalloy cold deformation microstructure mechanical property

收稿日期: 2014-10-24

基金资助:^*ANSTO-SINAP 联合材料研究项目2014DFG60230, 国家自然科学基金51371188和51371189, 中国科学院战略性先导科技专项项目 XD02004210资助。

作者简介: 梁建平

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图1 不同变形量GH3535合金的金相组织

图2 不同变形量GH3535合金的室温拉伸真应力-真应变曲线

图3 不同变形量GH3535合金的力学性能

图4 不同变形量合金的硬度对比

图5 不同变形量GH3535合金室温拉伸真应力-真应变对数坐标曲线

表1 不同变形量GH3535合金Ludwigson模型的回归分析结果

图6 GH3535合金在不同变形量下的微观组织

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