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Liu's main achievements
1985 won the National May 1st Labor Medal, and 1990 was rated as the national advanced scientific and technological worker in universities and the national outstanding technical cooperation activist. Won the Talent Medal of Jilin Province, a professional and technical talent with outstanding contributions in Jilin Province, specializing in heat treatment, and a well-known scholar and outstanding scientist in the field of materials in China. Aiming at the problems of unqualified quality of traditional normalizing process of carburized gear, unstable machinability of gear blank and large product deformation, he proposed PDMS strengthening method for ordinary low steel grade. The solution of new isothermal normalizing technology is put forward, and the first isothermal normalizing production line in China is developed. There are metal heat treatment principle, steel isothermal heat treatment principle and so on. Among them, Principles of Metal Heat Treatment is the most cited theoretical document in the field of heat treatment, and it is still a compulsory theoretical course in many key universities.