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Modelling Creep and Creep-Fatigue Damage for CSEF Power Plant Steels

CSEF 电厂钢的蠕变和蠕变疲劳损伤建模

基本信息

批准号：
2337780
负责人：
金额：
--
依托单位：
University of Nottingham
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2019
资助国家：
英国
起止时间：
2019 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2337780
关键词：
Modelling Creep Fatigue Damage CSEF

项目摘要

The current market conditions are such that combined cycle gas turbine (CCGT) plants are now considering double two-shift operation, so potentially accruing upwards of 600 starts per year. The pressure to reduce the extent of pressure system inspections and repairs continues to increase, with the most recent capacity auction clearing prices for generation showing a significant reduction when compared to previous years. For operators of large generation facilities the key consideration is the through life revenue return, which will guide decisions on new plant builds and any capital investments on plant currently operating. On this basis the need for effective life prediction and condition monitoring tools to support the supply chain (designer, fabricator, operator and technical service provider) is evident.Over the years, significant development has been made on the 9-12%Cr creep strength enhanced ferritic (CSEF) steels. Traditionally, in material development for power plant components, creep ductility, which can be treated as resistance to damage, has received much less attention. However, the risk of catastrophic failure due to low damage tolerance is a real challenge, in particular, in the situation where mechanical and metallurgical constraints are present. In addition, due to the increasing frequency of cyclic operations, i.e. starts up and shut downs for main steam pipelines of power plants, low cycle creep fatigue failure due to low ductility of the materials has become an important concern.The aim of the proposed project is to investigate creep and creep fatigue behaviour which takes into account the variable ductility for CSEF power plant steels, through a comprehensive theoretical, experimental and computational programme.Specific objectives will include:1. Data acquisition/analysis and critical review on the currently available models and assessment procedure.2. Experimental/physical understanding of creep and creep fatigue behaviour of CSEF power plant steels with different initial ductility.3. Development of a novel creep and creep fatigue model which takes into account the variable ductility.4. Application of the model for component assessment using the operational data from a modern CCGT plant.High temperature mechanical testing and physical characterization will be carried out using well-established facility. The theoretical and modelling work will be carried out using finite element package ABAQUS through user defined subroutines.

目前的市场条件是，联合循环燃气轮机（CCGT）工厂现在正在考虑双两班制运行，因此每年可能会增加600次以上的启动量。减少压力系统检查和维修范围的压力持续增加，最近的发电容量拍卖清算价格与前几年相比显着降低。对于大型发电设施的运营商来说，关键的考虑因素是整个生命周期的收益回报，这将指导新电厂建设的决策和对当前运行的电厂的任何资本投资。在此基础上，对有效的寿命预测和状态监测工具的需求是显而易见的，以支持供应链（设计师、制造商、运营商和技术服务提供商）。近年来，9-12%Cr蠕变强度增强铁素体（CSEF）钢取得了长足的发展。传统上，在电厂部件材料的开发中，蠕变延展性被认为是一种抗损伤性，但却很少受到重视。然而，由于低损伤容限导致的灾难性失效风险是一个真正的挑战，特别是在存在机械和冶金限制的情况下。此外，随着电厂主蒸汽管道启停循环运行频率的增加，由于材料的低延性而导致的低循环蠕变疲劳失效已成为人们关注的重要问题。拟议项目的目的是通过全面的理论、实验和计算程序，研究考虑到CSEF发电厂钢的可变延性的蠕变和蠕变疲劳行为。具体目标将包括：1。数据获取/分析和对现有模型和评估程序的严格审查。具有不同初始延性的CSEF电厂钢蠕变和蠕变疲劳行为的实验/物理理解。考虑变延性的蠕变与蠕变疲劳模型的建立。该模型在现代CCGT装置运行数据的部件评估中的应用。高温机械测试和物理特性将使用完善的设备进行。理论和建模工作将通过用户自定义子程序使用有限元软件包ABAQUS进行。