Research on high temperature creep characteristics of metal materials


【Author】 Liang Haoyu;

【Instructor】 Duan Zihua;

[Basic information about the author] Taiyuan University of Technology, Chemical Process Machinery, 2013, Master

【Abstract】 In petrochemical, metallurgy, machinery and other industries, a large number of metal components serve under conditions of high temperature, high pressure, and strong corrosive media. Once these load-bearing components are accidentally damaged, it will lead to catastrophic consequences and huge economic losses. Therefore, higher requirements must be put forward for the safety and reliability of materials. Under the influence of high temperature and high pressure for a long time, these load-bearing components will also face a special challenge - high temperature creep. For example, for stainless steel pipelines that work under high temperature and high pressure for a long time, creep behavior determines the service life of the pipeline and its safety and reliability. There are great differences in the structure, chemical composition and thermophysical properties of different metal materials, so their creep properties are also different. For example, there are large differences in creep properties between low-alloy steels and stainless steels. In view of this, it is particularly important to study the high-temperature creep characteristics of metallic materials. At present, there are two main methods for researching the creep characteristics of metal materials: creep experimental research and finite element numerical analysis. The most commonly used experimental method is the uniaxial creep tensile test. However, due to its limitations, researchers have proposed the "Cryo-Cracking" method, micro-sample technology, etc. The new method can solve the problems of uniaxial tensile creep tensile testing such as excessive consumables and strict sample preparation requirements. But it’s still time-consuming and laborious. In comparison, finite element numerical analysis is not only low-cost, short-time consuming, high-precision, but also has a solid theoretical foundation. Therefore, this article uses finite element analysis software to study two commonly used steels in the chemical industry, low-alloy high-strength steel Q345R and austenitic stainless steel 304... More reduction

【Key words】 high temperature creep; stress concentration; creep limit; finite element numerical analysis;