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Effect of residual stress on the fracture of ferritic steels

残余应力对铁素体钢断裂的影响

基本信息

批准号：
2621975
负责人：
金额：
--
依托单位：
University of Bristol
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2621975
关键词：
Effect residual stress fracture ferritic

项目摘要

To accurately study the Residual Stress (RS) effect on fracture, the first step is to be able to create the expected Stress in the component while properly controlling of the intensity of the stress, which is the main difficulty. In order to develop a methodology to tune residual stress CEA-LISN has devised a heat treatment process which can adjust the residual stress induced in the material through careful adjustment of the heat treatment. The objective of this project is to help design and subsequently validate and optimise the heat treatment process. A combination of finite element simulation and experimental techniques such as deep hole drilling and neutron/x-ray diffraction will be used. As the first step, the heat treatment process designed by CEA will be simulated at Bristol. Both Abaqus and Code_Aster will be considered in the start of the project before a final decision is made within 6 months on which software to be used. The material of interest is a Framatome RPV pressure vessel steel with complex microstructure. A thorough literature review on the thermal treatment of ferritic-martensitic RPV steels will be carried out to identify the key influencing parameters (e.g. is there a phase transformation during the heat treatment). While awaiting material and the final design of the heat treatment process from CEA, the student at Bristol will be using a model material and a known heat treatment to assist with learning finite element simulation and residual stress measurement. Once the finite element simulation of the project is developed and validated, optimisation processes can be applied to it to fine tune the target residual stress through change in the heat treatment.

为了准确研究残余应力（RS）对断裂的影响，第一步是能够在部件中产生预期的应力，同时正确控制应力的强度，这是主要的难点。为了开发一种调整残余应力的方法，CEA-LISN 设计了一种热处理工艺，可以通过仔细调整热处理来调整材料中产生的残余应力。该项目的目标是帮助设计并随后验证和优化热处理工艺。将结合使用有限元模拟和深孔钻削和中子/X 射线衍射等实验技术。第一步，CEA 设计的热处理工艺将在布里斯托尔进行模拟。 Abaqus 和 Code_Aster 将在项目开始时予以考虑，然后在 6 个月内就使用哪个软件做出最终决定。感兴趣的材料是具有复杂微观结构的法马通 RPV 压力容器钢。我们将对铁素体-马氏体 RPV 钢的热处理进行彻底的文献综述，以确定关键的影响参数（例如热处理过程中是否存在相变）。在等待 CEA 提供材料和热处理工艺的最终设计时，布里斯托尔大学的学生将使用模型材料和已知的热处理来帮助学习有限元模拟和残余应力测量。一旦开发并验证了项目的有限元模拟，就可以对其应用优化过程，通过改变热处理来微调目标残余应力。