时效对含氮、铌和钒合金的奥氏体不锈钢 N50 的结构和机械性能的影响

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

Materials Research Express Pub Date : 2024-07-09 DOI:10.1088/2053-1591/ad5cd7

Sarkis Muradian, Mingzhou Liu, Yan Sun

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引用次数: 0

摘要

本研究调查了不同氮、铌和钒含量的奥氏体耐腐蚀 N50 合金钢。这种钢用于生产高强度低温管道。这些管道的生产工艺包括在 650 ℃-665 ℃ 下进行 50-100 小时的时效处理。因此，对钢材在交货状态、650 ℃ 100 小时时效处理和固溶热处理后的状态进行了检验。使用光学显微镜和扫描显微镜分析了钢的结构，并在室温和 -196 °C 下进行了拉伸和冲击强度测试。结果发现，老化后析出相的总体积分数更依赖于氮化物形成元素--铌和钒的总浓度，而不是氮。老化不会影响室温下的基本工作特性，但会严重影响 -196 ℃ 时的韧性。

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Effect of aging on the structure and mechanical properties of austenite stainless steel N50 alloyed with nitrogen, niobium and vanadium

In this study, the austenitic, corrosion-resistant N50 steel alloyed with different nitrogen, niobium and vanadium content was investigated. This steel is used in the production of high-strength, cryogenic pipes. The production process for these pipes involves aging at 650 °C–665 °C for 50–100 h. Therefore, steels were examined in their as-delivered state, after aging at 650 °C, 100 h and after solid solution heat treatment. The structure of the steel was analyzed using optical and scanning microscopy, tensile and impact strength tests were conducted at room temperature and at −196 °C. It was found that the total volume fraction of the precipitated phase after aging is more dependent on the total concentration of nitride-forming elements—Nb and V, than on nitrogen. Aging does not affect the basic operational properties at room temperature, but it can significantly affect toughness at −196 °C.

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来源期刊

Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

4.30%

发文量

640

审稿时长

12 weeks

期刊介绍： A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.