Effects of Static Strain Aging on Mechanical Performance of Ductile Cast Iron

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2024-07-05 DOI:10.1007/s11665-024-09716-9

Ville Björklund, Hannu Hänninen, Sven Bossuyt

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引用次数: 0

Abstract

EN-GJS-400-15U nodular cast iron intended to be used as load-bearing element in long-term geological disposal canisters containing spent nuclear fuel in Finland and Sweden was studied for static strain aging (SSA). Tensile test specimens manufactured from the nodular cast iron were pre-strained to 1%, 2% and 3% nominal plastic strains. The pre-strained specimens were aged at different temperatures ranging from room temperature to 400 °C for varying times. The aged specimens were tested with conventional tensile testing using constant cross-head speed of 0.016 mm/s. Additionally, four specimens were studied with digital image correlation (DIC) during the tensile testing to obtain full-field strain measurements. SSA resulted in elevated pronounced yield point in all the conditions, while the as-received material showed continuous yielding behavior. SSA reduced the elongation to fracture. DIC tests showed more localized yielding behavior in the SSA specimens. Over-aging effect was observed at 400 °C where increasing pre-strain did not increase the yield stress more. For 1-day aging time, the highest yield stress increment was found after aging at 200°C. The yield stress of the material was almost identical after aging in 100°C and 200°C.

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静态应变时效对球墨铸铁机械性能的影响

芬兰和瑞典打算将 EN-GJS-400-15U 球墨铸铁用作装有乏核燃料的长期地质处置罐的承重元件，对其进行了静态应变老化 (SSA) 研究。用球墨铸铁制造的拉伸试样被预应变至 1%、2% 和 3% 的名义塑性应变。预应变试样在从室温到 400 °C 的不同温度下进行不同时间的老化。使用 0.016 mm/s 的恒定十字头速度对老化试样进行传统拉伸测试。此外，在拉伸测试过程中还使用数字图像相关技术（DIC）对四个试样进行了研究，以获得全场应变测量值。在所有条件下，SSA 都导致屈服点明显升高，而原样材料则表现出连续屈服行为。SSA 降低了断裂伸长率。DIC 测试表明，SSA 试样的局部屈服行为更为明显。在 400 °C 下观察到了过老化效应，增加预应变并没有使屈服应力增加更多。在 1 天的老化时间中，200°C 老化后的屈服应力增量最大。材料在 100°C 和 200°C 老化后的屈服应力几乎相同。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered