文献类型：期刊文献

中文题名：基于固支直杆弯曲小试样的P91/P92钢蠕变性能对比评价研究

英文题名：Study on the evaluation of P91/P92 creep property based on the small beam specimen with fixed constraints

作者：韩笑[1];余海洋[1];周帼彦[1];涂善东[1]

机构：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

年份：2021

卷号：38

期号：4

起止页码：1

中文期刊名：压力容器

外文期刊名：Pressure Vessel Technology

收录：CSTPCD;;北大核心:【北大核心2020】；

基金：国家自然科学基金项目(51675181)。

语种：中文

中文关键词：P91/P92钢;固支直杆弯曲小试样;蠕变

外文关键词：P91/P92 steel;small beam specimen with fixed constraints;creep

摘要：长期服役于高温、高压工况的发电系统构件材料强度会逐步劣化,甚至蠕变断裂失效,将直接影响到热电厂的高效生产及设备安全。因此对比分析该系统构件常用材料P91/P92钢的高温力学性能,对该发电系统的材料选型设计及安全生产具有重要意义。基于固支直杆弯曲小试样梁弯曲本构模型,选择合适的试样尺寸,采用有限元方法对比分析了P91/P92材料的蠕变性能及其对温度和载荷的敏感度。研究结果表明,当固支直杆弯曲试样尺寸为b=2h=1.1 mm,l=12 mm时,在相同应力和温度条件下,P92材料稳态蠕变应变速率大幅降低,高温蠕变性能比P91材料更优异。P91材料对载荷更为敏感。温度低于625℃时,P91材料对温度更为敏感;温度高于625℃时,P92材料对温度更为敏感。研究结果为超(超)临界机组用钢的正确经济选材提供了依据。
The component material strength of power generation system in long-term service at high temperatures and pressure will gradually deteriorate,even fail due to creep fracture,which will directly affect the high-efficiency production and structure safety of thermal power plant.Therefore,it is of important significance to analyze the high temperature mechanical properties of P91/P92 steel commonly used in the system components for the material selection design and safe production of the power generation system.Based on the bending constitutive model of small bean specimens with fixed constraints,the creep behavior of P91/P92 steel and its sensitivity to temperature and load are analyzed by finite element method.The results show that when the specimen geometric size is b=2h=1.1 mm and l=12 mm,the steady-state creep strain rate of P92 steel decreases significantly under the same stress and temperature,and the high-temperature creep performance of P92 steel is better than P91 steel.P91 steel is more sensitive to load.When the temperature is lower than 625℃,P91 steel is more sensitive to temperature;and when the temperature is higher than 625℃,P92 steel is more sensitive to temperature.The above research results provide basis for correct and economical material selection of ultra-supercritical unit.