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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。
The effects of cold deformation on the mechanical properties of GH3535 alloy were studied. The microstructure of GH3535 alloy was observed by OM and TEM, and the work hardening of GH3535 alloy was analyzed with the true stress-true strain curve The deformation mechanism. The results show that the alloy GH3535 has significant work hardening characteristics. The cold deformation of the alloy increases the strength and hardness of the alloy, but the plasticity decreases. As the amount of deformation increases, the grains elongate along the deformation direction and the twins become larger and coarser. The work hardening law of GH3535 alloy follows the Ludwigson model. With the increase of cold deformation, the work hardening index of GH3535 alloy decreases, and the deformation mechanism changes from single slippage and twin to cross slip and twin. When the amount of deformation is less than 30%, work hardening is mainly caused by the long-range stress field and twins of dislocations. When the deformation is more than 30%, it is mainly caused by the short-range stress field and deformation twins of dislocations.