Embrittlement of 1Cr-1/2Mo pressure vessel steel during long-term service

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-05-30 DOI:10.1016/j.matlet.2025.138857

Nitin Saini, Zhe Lyu, Leijun Li

引用次数: 0

Abstract

Assessing the mechanical properties of in-service pressure vessels is essential to ensure their safe and continued operation. 1Cr-1/2Mo steel samples are collected from pressure vessels with different years of service exposure. Sub-size flat tensile specimens are tested, and the results show that with an increasing service exposure time, samples exhibited an increased strength, but a decreased ductility compared to the original material. Precipitation of nanoscale carbides within the ferrite/bainite grains has contributed to strengthening the material while the decrease in ductility is believed to be caused by larger size discontinuous carbide particles on the grain boundaries.

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1Cr-1/2Mo压力容器钢在长期使用过程中的脆化

评估在役压力容器的机械性能对确保其安全和持续运行至关重要。从不同使用年限的压力容器中采集1Cr-1/2Mo钢样品。对亚尺寸平面拉伸试样进行了测试，结果表明，与原始材料相比，随着使用时间的增加，样品的强度增加，但延展性降低。铁素体/贝氏体晶粒中析出的纳米级碳化物有助于材料的强化，而延展性的下降则是由于晶界上较大尺寸的不连续碳化物颗粒引起的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive