在GH4169超合金造的多工艺热成型过程中对微观结构演变机制的研究
Ming-Song Chen1,2, Hong-Wei Cai1,3, Yong-Cheng Lin2,3
1Light Alloy Research Institute, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|April 13, 2024
概括
这项研究揭示了在热成型过程中,变形前应变如何影响GH4169超合金微结构. 不均的应变导致高应变区的细粒和低应变区的混合粒,影响动态再结晶.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 超级合金是一种超级合金.
背景情况:
- GH4169超合金造需要多过程热成型.
- 了解热加工过程中的微结构演变对于优化性能至关重要.
研究的目的:
- 为了研究GH4169超级合金在热加工过程中的微观结构演变.
- 阐明 δ 阶段沉和应变分布对谷物精炼和动态再结晶的作用.
主要方法:
- 一个设计的工艺路径,涉及预变形,老化处理 (AT),高温保持 (HTH) 和最终变形.
- 分析微结构演变, δ 阶段沉和再结晶行为.
- 对核心平均误导 (KAM) 值的评估,以了解动态再结晶 (DRX) 核化.
主要成果:
- 不均的预变形应变显著影响谷物微观结构的细化,这是由于合的 δ 阶段演变和再结晶.
- 具有棒状δ相的细粒度微结构在高应变区域形成,而类似项链的微结构在低应变区域形成.
- 在混合粒微结构中,高KAM值和较小的平均粒径促进了动态再结晶核形成.
结论:
- 这项研究揭示了 δ 阶段和动态再结晶核化之间的相互作用机制.
- 优化预变形应变是控制GH4169件最终微观结构和性能的关键.
- 这些发现提供了关于为提高性能量身定制超合金微结构的见解.
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