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Nanoindentation Characterization of Creep-fatigue Interaction on Local Creep Behavior of p92 steel Welded Joint

Chinese Journal of Mechanical Engineering 2021年第6期34卷 85-97页

作者： Yuxuan Song Yi Ma Zhouxin pan Yuebing Li Taihua Zhang Zengliang Gao Institute of process Equipment and Control Engineering College of Mechanical EngineeringZhejiang University of TechnologyHangzhou 310014China Institute of Micro/Nano‑Mechanical Testing Technology&Application College of Mechanical EngineeringZhejiang University of TechnologyHangzhou 310014China Institute of Solid Mechanics Beihang UniversityBeijing 100000China Engineering Research Center of process Equipment and Re‑manufacturing Ministry of EducationHangzhou 310014China

In modern fossil and nuclear power plants,the components are subjected to creep,fatigue,and creep-fatigue(CF)due to frequent start-up and shut-down operations at high *** CF interaction on the in-service p92 steel welded joint was investigated by strain-controlled CF tests with different dwell times of 30,120,300,600 and 900 s at 650℃.Based on the observations of the fracture surface by scanning electron microscope(SEM),the character-istic microstructure of fatigue-induced damage was found for the CF specimens with short dwell times(30 and 120 s).The hardness,elastic modulus and creep deformation near the fracture edges of four typical CF specimens with 30,120,600 and 900 s dwell times were measured by *** to specimens with post-weld heat treatment(pWHT),lower hardness and creep strength were found for all CF *** addition,significant reduc-tions in hardness,elastic modulus,and creep strength were measured near the fracture edges for the CF specimens with short dwell times compared to the pWHT *** to pWHT specimens(0.007),the increased strain rate sensitivities(SRS)of 0.010 to 0.17 were estimated from secondary *** increased values of SRS indicate that the room temperature creeps behavior is strongly affected by the decrease in dislocation density after the CF tests.

关键词： p92 steel Welded joint Creep-fatigue interaction Nanoindentation Creep behavior

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Hot Deformation Behavior of p92 steel Used for Ultra-Super-Critical power plants

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Journal of Iron and steel Research International 2011年第7期18卷 53-58页

作者： SHI Ru-xing LIU Zheng-dong Institute for Structural Materials Central Iron and Steel Research Institute Beijing 100081 China

Hot compression tests of p92 steel at temperatures in the range of 1 173 to 1 523 K and at strain rates in the range of 0.1 to 10 s^-1 were carried out on a Gleeble-3500 thermal-mechanical simulator, and the corresponding flow curves were measured. The results showed that the flow stress and the peak strain increase with decreasing deformation temperature and increasing strain rate. The critical Z value, below which the complete dynamic reerystallization may occur, was determined to have 4.61 × 10^18. The hot deformation activation energy of the steel was about 437 kJ/mol. The hot deformation equation and the microstructure diagram of p92 steel were obtained. For the convenience of the practical application, the empirical equation for the peak stress can be described as σp=17. 17lnε＋902499/T-524.1.

关键词： p92 steel dynamic recovery recrystallizationl flow stressl Zener-Hollomon parameter

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prediction of Ac1 temperature in p92 steel weld metal

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China Welding 2012年第4期21卷 8-14页

作者：王学郑江鹏尚巍何秀 School of power and Mechanics Wuhan University Wuhan 430072 Atlantic China Welding Consumables INC Zigong 643010

The effects of major alloying elements on the Ac, temperature in p92 steel weld metal were evaluated by Thermo- Calc, and a formula relating Ac1 to the content of major alloying elements was developed using multiple regression method. Results show that both C and N reduce Ac, temperature in weld metal, the effect of N on Ac, is greater than that of C, but their influence on Act is not so significant when they individually vary in the specified chemical composition ranges. Si, Cr, Mo and W increase the Acl temperature, and the descending order of their effects is determined as Si, Mo, W, Cr. Mn and Ni decrease the AcI in weld metal, the decreasing effect is especially remarkable when the （ Mn ＋ Ni） ≥ 1%. The effect of Co is moderate and is much smaller compared to Ni. The variations of Acl for the ranges of micro-alloying elements Nb and V are also evaluated, the effect of V is greater compared to Nb and the effect of Nb could be ignored in the specified chemical composition range. A prediction formula for Ac, temperature in p92 steel weld metal within the specified chemical composition ranges was developed based on the comprehensive consideration of the calculated Ac, temperatures and the experimentally measured results.

关键词： p92 steel weld metal Ac1

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Effects of Ni and Co on the Ac1 temperature of p92 steel weld metal

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China Welding 2012年第1期21卷 18-21页

作者：王学郑汀鹏尚巍 School of power and Mechanics Wuhan UnivetsityWuhan430072

The effects of the addition of O - 1.2wt. % Ni and 0 - 2wt. % Co in F92 steel weld metal on its A L temperature was analyzed using computational thermodynamic software （ Thermo-CalcTM ） in this paper. The results indicate that both Ni and Co decrease the A, of p92 .steel weld metal, and each elements has a pronounced linear relationship with the At. The il^fluence of Ni on A,I is much larger than that of Co. In order to evaluate effects of Co and Ni in combination on AI of p92 .steel weld metal, an equation Ni = Ni ＋ O. 096Co was developed. According to the formula, the decreaing effect of Co on A., is jun about 1 / 10 of that of Ni. For welding consumables of p92 steel, the .substitution of Co for Ni （part or whole） could be an appropriate way to avoid the strong reduction of A and improve the properties of weld metal.

关键词： p92 steel weld metal Acl temperature

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Low Cycle Fatigue Behavior and Cyclic Softening of p92 Ferritic-martensitic steel

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Journal of Iron and steel Research International 2015年第6期22卷 534-542页

作者： Zhen ZHANG Zheng-fei HU Li-kun FAN Bin WANG School of Materials Science and Engineering Tongji University Shanghai Key Laboratory for Engineering Materials Application Evaluation Shanghai Research Institute of Materials

The low cycle fatigue （LCF） behavior of p92 martensitic steel was investigated under different controlled strain amplitudes at room and high temperatures （873 K）. The cyclic stress responses at all temperatures and strain amplitudes exhibited obviously rapid softening behavior at the early stage of fatigue life, and there was no saturated stage at high temperature. The fracture surfaces of the fatigue samples were observed by scanning electron microsco py （SEM） and optical microscopy. It was shown that crack initiation and propagation occurred transgranularly at both testing temperatures. A typical character was the high density crack branches or secondary cracks along fatigue striations at high temperature, which initiated from the oxidized inclusions and grain boundaries. Further investiga- tion by transmission electron microscopy （TEM） showed that the softening behavior was attributed to the micro- structure evolution during fatigue life, such as annihilation of dislocations and migration of martensite laths as well as carbide coarsening, especially for samples tested at high temperature.

关键词： low cycle fatigue p92 steel oxidative damage cyclic softening

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Low cycle fatigue testing and modeling of p92 ferritic-martensitic steel at room temperature

Low cycle fatigue testing and modeling of P92 ferritic-marte...

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第十八届全国疲劳与断裂学术会议

作者： Zhen Zhang ZhengFei Hu School of Materials Science and Engineering Tongji UniversityShanghai Key La boratory for R＆D and Application of Metallic Functional Materials

The low cycle fatigue（LCF） behavior of p92 ferritic-martensitic steel at room temperature（RT） has been extensively *** test results of fatigue lifetime are well consistent with the Coffin-Manson relationship over a range of controlled total strain amplitudes from 0.25 to 0.80%.The results show that cyclic softening behavior is the main mechanical feature observed in this *** rapid softening（10-500 cycles） and saturation part of cyclic softening stage of p92 steel at room temperature can be described by the non-linear isotropic/kinematic hardening model and the isotropic hardening parameters show that the amount and rate of softening all increase with the increasing of total strain ranges during the cyclic loading at room temperature.

关键词： low cycle fatigue p92 steel cyclic softening isotropic/kinematic hardening

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