Research Progress on the Ductile-to-Brittle Transition of Metal Materials: The Impact of FATT50

Abstract

In low-temperature conditions, the ductile-to-brittle transition behavior of metal materials is crucial for the safety of engineering structures. This transition leads to the rapid expansion of cracks and could potentially result in accidents. Through retrieval and analysis of the Web of Science database, it was found that research on ductile brittle transition has shown a significant growth trend since 1990, with increasing international collaboration, primarily led by countries such as China, the United States, and Japan. Keyword analysis indicates a primary focus on aspects such as the mechanical properties of materials, the impact of composition on ductility and brittleness, microstructure, and temperature. This paper focuses on FATT50 (Fracture Appearance Transition Temperature at 50% Fracture Probability), 81 刘继江 等：金属材料韧脆转变研究进展：FATT50 的影响 http://www.materialsrd.com comprehensively reviewing domestic and international standards for FATT50. It deeply analyzes the interrelationships between FATT50 and key factors such as material chemical composition, microstructure, and heat treatment. The study reveals that FATT50 is influenced by these factors collectively, especially in terms of chemical composition, microalloying elements, and impurities, which can significantly improve the low-temperature brittleness of metals and subsequently affecting the FATT50 temperature. Changes in microstructure may lead to increased brittleness of metals at low temperatures. Furthermore, the choice of heat treatment process also has a significant impact on FATT50, and adjustments in temperature and time can effectively improve or exacerbate the performance of metals at low temperatures. This research provides valuable insights for understanding and optimizing the performance of metal materials under low-temperature conditions, offering important guidance for engineering practices and materials design.