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Assessment of the stress-oriented precipitation hardening designed by interior residual stress during ageing in IN718 superalloy
Materials Science and Engineering: A ( IF 6.4 ) Pub Date : 2018-05-16 , DOI: 10.1016/j.msea.2018.05.016
Hailong Qin , Zhongnan Bi , Hongyao Yu , Guang Feng , Ruiyao Zhang , Xia Guo , Hai Chi , Jinhui Du , Ji Zhang

The following study presents a novel approach that utilizes residual stresses inside a component to produce stress-oriented precipitation and achieves texture strengthening during the ageing treatment. Refined investigations for the stress-oriented precipitation of γ″ were achieved via transmission electron microscopes (TEM) and neutron diffraction (ND). The results showed that all three variants of γ″ nucleated at short ageing times. The orienting effect of stress was appreciable only during the Ostwald ripening, due to the change of the γ″/γ lattice mismatch. The effect that the stress-oriented precipitation had on the mechanical properties was evaluated and analyzed via tensile tests.



中文翻译:

由IN718高温时效过程中内部残余应力设计的应力定向沉淀硬化的评估

以下研究提出了一种新颖的方法,该方法利用组件内部的残余应力产生应力导向的沉淀并在时效处理过程中实现纹理增强。通过透射电子显微镜(TEM)和中子衍射(ND)对γ''的应力定向沉淀进行了精细研究。结果表明,γ''的所有三个变体均在较短的老化时间内成核。由于γ''/γ晶格失配的变化,应力的定向作用仅在奥斯特瓦尔德(Ostwald)熟化期间才可观。通过拉伸试验评估和分析了应力定向沉淀对机械性能的影响。

更新日期:2018-05-16
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