This project belongs to the technical fields of [Metal Material Processing and Manufacturing Process] and [Heat Treatment Process and Equipment].
Heat treatment is a key technology to ensure and improve the quality and reliability of mechanical products and extend their service life. It is a core element of manufacturing competitiveness. Backward heat treatment technology, especially heat treatment and quenching technology, is one of the main links that restrict the improvement of my country's high-end equipment manufacturing level. It is also the main reason for the large gap between high-end equipment products and industrially developed countries in terms of quality levels such as reliability and service life. The reason has become a bottleneck that needs to be broken through in the transformation and development of my country's equipment manufacturing industry.
Supported by the 973 Plan of the Ministry of Science and Technology, major special projects of the Ministry of Industry and Information Technology, and major scientific and technological research projects of the Shanghai City Science and Technology Commission, this project carries out basic research on solid state phase transformation of materials and structure-performance relationships for large forgings of nuclear power and thermal power energy equipment and high-end construction machinery high-strength steel plates., develops heat treatment numerical simulation software and applies it to quenching process design and quenching equipment optimization, forming key heat treatment quenching technologies with independent intellectual property rights. The main results include:

1. Developed Thermal Prophet, a numerical simulation software for heat treatment with independent intellectual property rights, and developed a heat treatment quenching process design and optimization technology for large forgings based on numerical simulation. Combined with the physical simulation of heat treatment and quenching, a heat treatment and quenching process for rotor forgings and nuclear power pressure vessel forgings of million-kilowatt ultra-supercritical units/nuclear power turbine units/generator units has been formulated, which solves problems such as quench cracking and insufficient cooling strength of forgings. The overall mechanical properties of the forgings have reached the advanced level of similar foreign products, breaking the monopoly of foreign technology and ensuring a successful heat treatment of AP1000 nuclear power pressure vessel large forgings. The world's first production and delivery of the first set of forgings for the AP1000 nuclear power regulator was achieved.
2. Developed quenching method optimization and heat treatment equipment optimization technology based on computational fluid dynamics. An extended solution domain model for heat treatment, quenching and heating is proposed, which expands the simulation object from a single large forging to the entire system of large forging, furnace body, tooling, etc. The fluid-solid coupled heat transfer and radiation and convection are used in the heat transfer calculation. The comprehensive heat transfer makes the model closer to the actual working conditions. This technology is effectively applied to the structural improvement of large forgings quenching water tanks and the design of fixtures in large open-close furnaces, ensuring the efficiency, energy conservation and uniformity of large forgings quenching heating and cooling equipment, as well as the final organization and performance of large forgings after heat treatment. requirements.
3. Developed a quenching deformation control technology for entire large-area high-strength steel sheet based on material mechanical properties and the evolution of quenching internal stress. It solves the problem that large-area high-strength steel sheets for domestic high-end construction machinery and equipment are difficult to flatten after heat treatment, and is successfully applied to high-strength steel plate heat treatment production lines, achieving excellent results of unevenness less than 2mm, which are better than the requirements of imported steel plates., realizing large-scale domestic production of this kind of high-strength steel plate.
   This project has obtained 8 authorized invention patents, 4 software copyrights, and 3 drafting national standards. It has published 1 monograph and published 27 papers, of which 19 are included in SCI and EI. The appraisal of the AP1000 nuclear power large forgings organization by the China Machinery Industry Federation believes that its production technology has reached the international advanced level. The results of this project have been applied in Shanghai Electric Heavy Casting and Forging Co., Ltd., Sany Group Co., Ltd. and other units. In the past three years, the new output value has increased by 1.6 billion yuan, the profit has been nearly 350 million yuan, the tax revenue has been nearly 170 million yuan, and the foreign exchange savings have been US$250 million. The economic and social benefits have been remarkable. The technical achievements of this project are applied to the manufacture of large forgings for nuclear power/thermal power and high-strength steel plates for high-end construction machinery. They provide important support for Shanghai's development of high-end equipment manufacturing industry, make important contributions to the safe and efficient development of nuclear power in my country, and greatly enhance my country. The international competitiveness of high-end construction machinery products.