时间：2016年4月23日（星期六）14:30-16:30

地点：皇冠新体育app报告厅

题目1：Development of a new generation of ferritic steels for ultra-supercritical power plants and their inspection & life assessment

主讲人：Dr Ahmed SHIBLI, European Technology Development (ETD)

摘要：A new generation of high Cr (9-12%Cr) martensitic steels have been developed for the new generation of higher temperature and pressure power plant boilers in order to increase plant efficiency and reduce environmental pollution. However, enhanced performance of high Cr martensitic steels, such as ASME P91, is dependent on their proper heat treatment both during manufacturing and welding. Appropriate and precise heat treatment is critical to achieving their full potential and even small deviations can result in a much weaker material which in its strength can be closer to low alloy P22 steel or non-martensitic 9Cr steel P9. In these days of privatisation and intense price competition many utilities and plant manufacturers or owners / operators have ended up purchasing P91 steel from low cost steel producers and critical components fabricated by companies with less than satisfactory experience or understanding of P91 steels characteristics or its welding.

Thus today in many power plants worldwide we find aberrant P91 components where base material or weld metal, or both, have not been appropriately heat treated and thus are vulnerable to earlier cracking and failure. In view of the fact that the traditional NDE techniques are failing to find damage in these components at an early stage in life and that there is no data available for the integrity and life assessment of aberrant P91 components, plants operators are finding it difficult to assure the safe performance of such components.

In view of this international community has started new initiatives to resolve these challenges by developing new NDE techniques and by generating long term stress rupture data on a number of aberrant P91 base metal and weldment combinations. Some of these issues and new initiatives will be discussed in this presentation.

主讲人简介：Dr Ahmed Shibli is the Managing Director of European Technology Development and is a practising metallurgist. He has led and co-ordinated a number of European and International Industry projects. Dr Shibli has been working on P91 and P92 for the past 20 years and has written a number of reviews and conducted training courses on these.

Dr Shibli has been successfully coordinating and running two other large P91 and P92 related Group Sponsored Projects (GSPs) – one on inspection, lifing and integrity of in-service P91 material and the other on P91 subjected to ‘aberrant’ or ‘abnormal’ heat treatment. Thus Dr Shibli has an excellent and well recognised expertise in P91 research, industry experience with the sue of it and new developments in this area.

Dr Shibli has run European Creep Collaborative Committee (ECCC) – a grouping of some 47 industry and research organisations from about 15 countries - for over a decade and has run many of its creep related research projects. He has also initiated and run a number of research projects for the European Commission and European industry. Dr Shibli now coordinates and leads the activities of European Pressure Equipment Research Council (EPERC).

题目2：Heat Resistant Steel Development and Creep Degradation/ Life Assessment Technology

主讲人：Prof. Dr. Fujimitsu Masuyama, Department of Materials Science and Engineering, Kyushu Institute of Technology

摘要：Modeling and simulation techniques are sometimes useful and strong tools for not only material properties assessment but also alloy explores and material development. The techniques themselves are created as the novel ideas however the modeling and simulation need actual data base to run. The exploitation and development of heat resistant materials for power boiler and turbine applications have been ongoing for more than five decades in order to mainly improve creep rupture strength. Through this effort, particularly due to the development of high strength ferritic steels the steam conditions, temperature and pressure of power plants have significantly raised to date. According to conventional alloy development techniques, creep strength can be improved by optimizing chemistry and heat treatment based on experience and creep test data obtained after long-term creep tests for several years or more. This can be very slow forward, but a steady way to develop the alloys modifying conventional materials based on experiences (a posteriori approach). On the other hand it is possible that scientific or mathematical models can provide the most economical path, with a different approach to alloy development (a priori approach), however it is necessary to verify the test results obtained from the material actually melted meet to the predicted results by modeling. In this presentation in the field of high strength heat resistant steels for power application the creep strengthening mechanisms and steel development history are reviewed and predicted properties of proposed new alloys by a combination of mechanical property models based on neural networks, and phase stability calculation relying on thermodynamics are demonstrated in comparison of the results showing how the proposed alloys have performed in practice, considering long-term creep data and microstructural observation. Also some alloy exploitation ideas based on the creep strengthening mechanism and findings in conventional approach。

The metallurgical damage caused by carbide precipitation and growth, and changes in dislocation structures in the heat resistant steels due to creep loading are found in conjunction with the mechanical damage of deformation and/or cavities during the high temperature and high pressure service exposure. However since such microstructural changes are also caused by thermal aging it is difficult to distinguish the effect of creep. In order to perform the creep life assessment and diagnose of the heat resistant steels used in the high temperature components, it is essential to understand the creep-induced microstructural evolution and creep damage processes to develop life evaluation technology. Therefore the microstructural evolution as a creep damage process and the trigger effect of this on the initiation of mechanical damage are investigated and discussed to understand the creep damage processes in Cr-Mo low alloy steels and creep strength enhanced ferritic steels such as grade 91. The creep life assessment and diagnose techniques for boiler components successfully applied are also introduced as well.

主讲人简介：Professor Masuyama has been teaching and conducting research in Kyushu Institute of Technology in Mechanical Metallurgy and Product System Engineering since April, 2003 retiring from Mitsubishi Heavy Industries. He has about 40-year experience in materials science, mechanical/ physical metallurgy, corrosion science, joining, and boiler and pressure vessel technology. Prof Masuyama is the inventor of Grades 23, 122, HCM9M, and HCM12, and has been instrumental in the commercial application of Grades 91 and 92 in the ultra-super critical power plants.

He is an ASME Code Committee 28-year member since 1988 for Section II, Materials and Section I, Power Boiler, and an ASME Fellow.

Prof. Fujimitsu Masuyama received PhD from Osaka University, Japan