Metal soft magnetic materials are widely used in the fields of national defense, military industry, and civilian power electronics due to their excellent magnetic properties. These include high-power medium and high-frequency transformers, high-frequency switching power supplies, electromagnetic compatibility components, high-precision current transformers, as well as in magnetic detection and probing applications. However, domestically, high-performance metal soft magnetic materials mainly rely on imports. The prices of foreign products are high, and there is a high level of technological blockade, which severely restricts the development of related national defense and civilian technologies in China. Although China has developed alloy compositions similar to those abroad, there is still a certain gap in processing and manufacturing technology compared to foreign countries. This project, spanning nearly 10 years, with the support of related topics, started with the study of material science mechanisms in processing and manufacturing technology, revealing the relationship between processing and manufacturing processes and material structure and performance, overcoming key technical challenges in processing and manufacturing. Innovatively developed a variety of high-performance metal soft magnetic materials, achieved the industrialization of related materials and their key processing and preparation technologies, and have been applied in national defense, economic and social security fields such as aerospace equipment, civilian power electronic devices, non-destructive testing, and criminal investigation. The main work and innovative achievements are as follows: 1. The nanocrystallization process of iron-based amorphous alloy materials is a complex dynamic process that is temperature-sensitive and involves multiple steps of crystallization superimposition. A kinetic model for the study of amorphous alloy nanocrystallization mechanism using an isothermal method was constructed, clarifying the nanocrystallization mechanism of typical amorphous alloys. Based on this, a key processing and preparation technology for the nanocrystallization of iron-based amorphous alloy materials was established, providing a reliable theoretical foundation and technical support for the optimization of key heat treatment processes for the large-scale production of iron-based amorphous nanocrystalline materials; 2. In response to the high frequency loss and low inductance issues of conventional magnetic core materials for common mode choke coils treated by magnetic field heat treatment, a composite magnetic field heat treatment technology was established, developing iron-based soft magnetic materials with high saturation magnetization and initial permeability, achieving the industrialization of high-performance common mode choke coil magnetic core materials; 3. In view of the problem that during the nanocrystallization process of iron-based amorphous materials, the sudden increase in temperature due to crystallization heat release can lead to a deterioration in the performance of magnetic core devices, which is a challenge for large-scale production, a heat treatment technology was established that uses heat sinks to reduce the temperature rise in the magnetic core itself caused by crystallization heat release, achieving the industrialization of iron-based nanocrystalline soft magnetic materials for current transformers' cores 1. Application and industrialization of the technology; 2. Preparation of magnetic cores with a giant magnetoresistance effect exceeding 800% using magnetron sputtering and electroplating methods, successfully applied in fields such as automotive electronic sensors and non-destructive testing; 3. In response to the current issue that criminal investigation magnetic powders mainly rely on imports and are relatively expensive, by adopting a combination of solid-state diffusion metallurgy and subsequent heat treatment, high-performance fingerprint trace revealing iron-based nanocrystalline magnetic powders have been developed and produced. This has achieved successful application of iron-based nanomagnetic powder for fingerprint trace revealing under different objects and environmental conditions, with an effect comparable to foreign imported products. Upon appraisal, the overall level of project achievements has reached international advanced standards, and the theory of nanocrystallization and heat treatment process technology are novel and creative internationally. Applied for 10 invention patents, authorized 6; published 40 SCI-indexed papers, including 8 in top 5 journals of the field of metal and metallurgical engineering. Some achievements have been industrialized and successfully applied in the fields of national defense, people's livelihood, and social security. The achievements of this project have been applied by China Aerospace Science and Industry Corporation, Shanghai Public Security Bureau, and related military units and civilian enterprises, bringing significant social benefits. In the past three years, this project has generated an additional output value of over 60 million yuan, achieving good economic benefits. Through the implementation of this project, it has promoted the technical level of equipment and component development and application in the fields of national defense, people's livelihood, and social security in China. It has reduced dependence on foreign imported products and enhanced the scientific and technological strength in these areas, contributing to the development of national defense and society.