Effect of Partitioning Time on the Microstructure and Mechanical Properties of Q&P Steels
The microstructure and properties of Q&P steel were studied by means of tensile test,OM and SEM after simulating heat treatment process in salt bath furnace.The results showed that the main microstructure of Q&P steel was lath martensite and retained film austenite.With the increase of partitioning time,the morphology of the parallel martensite lath became clear and ordered.With the trivialness and disorder with massive martensite appearing,the yield strengths and tensile strength decreased initially and then increased.On the other hand,the elongation increased initially and then decreased.This was because of that the retained austenite is unstable at the beginning for low carbon content,and the carbide precipitated after a long partitioning time.Therefore,there was an optimum partitioning time to obtain the best properties combination.Under 250℃ quenching temperature and 350℃ partitioning temperature,partitioning time was 60s,the tensile strength and elongation were 1027MPa and 27%,respectively.The product of strength and elongation was up to 27729MPa·%.
Q&P steel Partitioning time Retained austenite Strength and ductility Mechanical property
Kangkang Ren Yonglin Kang Shuai Zhu
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 1 School of Materials Science and Engineering, University of Science and Technology Beijing,Beijing 10
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
303-307
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）