Effect of annealing temperature and time on microstructure and mechanical properties of high Cr ferritic casting steel

2017 2nd International Seminar on Advances in Materials Science and Engineering

Suo, Z.Y.^1,2 ; Fu, L.M.^2 ; Zhang, R.N.^3 ; Wang, Y.J.^1 ; Shan, A.D.^2

College of Mechanical and Electrical Engineering, Jilin Institute of Chemical Technology, 45 Chengde Street, Jilin

132022, China^1

School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai

200240, China^2

Shanghai Institute for Design and Research in Environmental Engineering, 345 Lane 11 Shilong Road, Shanghai

200233, China^3

关键词: Adhesive wears;    Annealing temperatures;    Crystal precipitation;    Effect of annealing;    Microstructure and mechanical properties;    Morphology of carbides;    Wear mechanisms;    Wear resistant;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/231/1/012131/pdf
DOI  :  10.1088/1757-899X/231/1/012131

来源: IOP

【 摘 要 】

A new-type of high Cr ferrite cast steel was designed and investigated. Effects of annealing temperature and time on the microstructure and mechanical properties of the high Cr ferrite cast steel were studied. The results show that the microstructures of the as-cast and annealing steels are composed of ferrite and (Cr•Fe)23C6carbide. The morphology of carbides is from long rod and the continuous network to crystal precipitation for the steels with increasing of annealing temperature and time. The impact toughness is slightly increased from 6 J/cm2to 8 J/cm2when the annealing temperature increases from 1180 to 1200 . But the hardness is about HB 200 and no obvious differences between the as-cast and annealing steels. The most suitable annealing temperature and time are 1200 and 5 h, respectively. The wear resistance of the high Cr ferrite cast steel is increased and improved with annealing temperature and holding time at 260 . The wear mechanism is changed from abrasion wear to abrasive and adhesive wear. The good wear-resistant of the high Cr ferrite cast steel is mainly attributed to the fine uniformly dispersed carbides.