The influence of long-term thermal exposure on microstructural stabilization and mechanical properties in 9Cr-0.5Mo-1.8W-VNb heat-resistant steel

Xiaofeng Guo; Yong Jiang; Jianming Gong; Xiaoxiang Weng

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The influence of long-term thermal exposure on microstructural stabilization and mechanical properties in 9Cr-0.5Mo-1.8W-VNb heat-resistant steel

机译：长期热暴露对9Cr-0.5Mo-1.8W-VNb耐热钢组织稳定性和力学性能的影响

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A series of long-term thermal aging experiments on P92 steel were carried out at 650 ℃ from 200 h up to 1.1 × 10~4 h. Microstructural evolution of the samples during long-term aging exposure was investigated using OM observations, SEM examinations and TEM investigations. Additionally, variations of mechanical properties, including tensile properties, Charpy impact toughness and Vickers micro-hardness were also exhibited. Experimental results indicate that martensitic lath structure, M_(23)C_6 carbides as well as MX carboniterides all exhibit a high stability during short-term aging exposure, whereas Laves phase grows rapidly in this period. After the long-term aging treatment, the recovery of martensitic lath structure occurs after an incubation period, which is resulted from the continuous growth and coarsening of M_(23)C_6 and Laves phase. Based on the correlations between the microstructural evolution and the variations of mechanical properties during long-term aging exposure, the degradation mechanism of P92 steel was discussed.

机译：对P92钢进行了一系列长期热时效实验，并在650℃下从200h到1.1×10〜4h进行了热处理。使用OM观察，SEM检查和TEM研究，研究了长期老化暴露过程中样品的微观结构演变。另外，还表现出机械性能的变化，包括拉伸性能，夏比冲击韧性和维氏显微硬度。实验结果表明，马氏体板条结构，M_（23）C_6碳化物以及MX碳氮化物在短期时效暴露中均显示出高稳定性，而Laves相在此期间迅速增长。经过长期的时效处理，在潜伏期后恢复了马氏体板条结构，这是由于M_（23）C_6和Laves相的连续生长和粗化导致的。基于长期时效暴露过程中组织演变与力学性能变化之间的相关性，探讨了P92钢的降解机理。

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《Materials Science and Engineering》 |2016年第30期|194-202|共9页
作者
Xiaofeng Guo; Yong Jiang; Jianming Gong; Xiaoxiang Weng;
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作者单位

School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China,School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China;

School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;

School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;

School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, Jiangsu 210009, China;

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正文语种 eng
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Long-term aging; Microstructure; Mechanical property;

机译：长期老化;微观结构机械性能;

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1. Microstructural Evolution and Mechanical Properties of Short-Term Thermally Exposed 9/12Cr Heat-Resistant Steels [J] . WEI WANG, WEI YAN, WEI SHA Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science . 2012,第11期

机译：短期热暴露9 / 12Cr耐热钢的组织演变和力学性能
2. Changes in Microstructural and Mechanical Properties of AISI Type 316LN Stainless Steel and Modified 9Cr-1Mo Steel on Long-Term Exposure to Flowing Sodium in a Bi-Metallic Sodium Loop [J] . Bharasi N. Sivai, Pujar M. G., Thyagarajan K., Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science . 2015,第12期

机译：长期暴露于双金属钠环中流动的钠时，AISI 316LN型不锈钢和改性9Cr-1Mo钢的显微组织和力学性能的变化
3. Effect of long-term aging on microstructural stabilization and mechanical properties of 20Cr32NilNb steel [J] . Xiaofeng Guo, Xiankai Jia, Jianming Gong, Materials Science and Engineering . 2017,第APRa6期

机译：长期时效对20Cr32NilNb钢显微组织稳定性和力学性能的影响
4. High-temperature mechanical properties in 9Cr-0.5Mo-1.8W-VNb steel after long-term aging at 650℃ [C] . Xiaoxiang Weng, Yong Jiang, Jianming Gong, China-Japan bilateral symposium on high temperature strength of materials;Chinese Mechanical Engineering Society;Society of Materials Science . 2016

机译：650℃长期时效后9Cr-0.5Mo-1.8W-VNb钢的高温力学性能
5. Mechanical properties, thermal stability and radiation damage of ferritic steels processed by thermal mechanical treatments [D] . Song, Miao. 2014

机译：通过热机械处理加工的铁素体钢的机械性能，热稳定性和辐射损伤
6. Mechanical and Thermal Influences on Microstructural and Mechanical Properties during Process-Integrated Thermomechanically Controlled Forging of Tempering Steel AISI 4140 [O] . Bernd-Arno Behrens, Kai Brunotte, Tom Petersen, 2020

机译：加工钢铁AISI 4140过程集成热机控锻造过程中微观结构和机械性能的机械和热影响
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

The influence of long-term thermal exposure on microstructural stabilization and mechanical properties in 9Cr-0.5Mo-1.8W-VNb heat-resistant steel

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