镍基高温合金690的研究现状

690合金是一种面心立方结构的镍基高温合金,具有优异的高温力学性能和耐腐蚀性能,被广泛应用于核电、石油化工和航空航天等领域.文中对690合金的微观组织演化、热成形特性、高温失塑裂纹和耐应力腐蚀性能等方面的研究现状进行了总结分析.目前,部分合金元素对690合金组织性能的影响较为复杂,成形工艺参数对690合金高温变形行为和微观组织演化行为的影响规律尚未探明,690合金高温失塑裂纹和应力腐蚀裂纹缺陷的形成机理尚未掌握.建议后续690合金的研究重点应集中在确定合金元素的含量范围,复杂零部件热成形工艺全流程精确建模以及探究高温失塑裂纹和应力腐蚀开裂形成机制等方面.

Research Progress in Nickel-based Superalloy 690

Superalloy 690 is a nickel-based superalloy with a face-centered cubic structure. Due to the excellent mechanical properties and corrosion resistance at high temperatures, superalloy 690 is widely used in the nuclear power, petrochemical engineering, aerospace and other fields. The work comprehensively reviewed the research progress in microstructure evolution, hot forming characteristics, ductility dip cracking at high temperature and corrosion resistance of superalloy 690. The effects of alloying elements on the microstructure and mechanical properties are very complicated. Moreover, the effects of hot forming processing parameters on the hot deformation behaviors and microstructure evolution still need to be clarified. Additionally, the formation mechanisms of ductility dip cracking at high temperature and stress corrosion cracking need to be further investigated. In the following study, determining the content range of alloying elements, precisely modeling the hot forming process of complex components and exploring the cracking formation mechanism should be the research focus in superalloy 690.