Microstructural and mechanical properties evolution of alloy C-HRA-2 aging at 800 °C for up to 10,000 h

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design Pub Date : 2025-05-11 DOI:10.1016/j.matdes.2025.114040

Chen Dong , Yuanchao Xu , Hongjian Qian , Lanlan Ma , Quanquan Yang , Zhengjun Wang , Liyuan Li

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Abstract

The microstructural and mechanical properties of alloy C-HRA-2 aged at 800 °C were investigated. For up to 10,000 h, the mechanical properties remain stable. The yield strength is maintained at 410–425 MPa, and the tensile strength is maintained at 840–870 MPa, the elongation and area reduction are maintained at 40–45 %, and the impact toughness is maintained at 125–145 J. The main precipitate during the aging is M₂₃C₆, which is mainly needle/rod-shaped at the interior grain and granular at the grain boundary. A small amount of M₆C and MX phases are also found at the grain boundary. After long-term aging, the needle/rod M₂₃C₆ gradually evolved into granular M₂₃C₆. The contribution to the alloy’s yield strength during the aging process mainly comes from solid solution strengthening (around 220–230 MPa) and M₂₃C₆ precipitation strengthening (around 110–120 MPa). Compared with the alloy aged at 700 °C, its yield strength after aging at 800 °C is reduced by about 50 MPa. The main reason is that the needle/rod M₂₃C₆ in the grain becomes coarser at higher temperatures.

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C- hra -2合金800℃时效10000 h的组织和力学性能演变

研究了C- hra -2合金在800℃时效后的组织和力学性能。在长达10,000小时的时间里，机械性能保持稳定。屈服强度保持在410 ~ 425 MPa，抗拉强度保持在840 ~ 870 MPa，伸长率和面积收缩率保持在40 ~ 45%，冲击韧性保持在125 ~ 145 j。时效过程中主要析出相为M23C6，主要为晶内针状/棒状，晶界处呈粒状。在晶界处还发现少量的M6C和MX相。经过长期时效，针状/棒状M23C6逐渐演化为粒状M23C6。时效过程中对合金屈服强度的贡献主要来自固溶强化（约220 ~ 230 MPa）和M23C6析出强化（约110 ~ 120 MPa）。与700℃时效合金相比，800℃时效合金的屈服强度降低了约50 MPa。主要原因是晶粒中的针状/棒状M23C6在高温下变粗。

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来源期刊

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.