Ausferritic Cast Iron with Flake Graphite-Technology and Properties
Basing on the studies of reference literature and own investigations, four chemical compositions of the base cast iron were selected, and bars of 30,60 and 90 mm diameters were cast from each composition. Austempering was performed at temperatures of 270,300,330 and 360 ℃. Microstructure was examined under optical microscope and using TEM and SEM. The mechanical properties of cast iron in as-cast condition and after heat treatment were tested, including the tensile strength Rm (MPa) ,elongation A; (％) and Brinell hardness HB. The cast iron hardenability was determined by Grossman method through measurement of hardness distribution on the cross-section of bars of different diameters. The cast iron of the highest mechanical properties(Rmof approx. 520 MPa,HB of approx. 370)was subjected to further investigations plotting the CCT diagram. Austenite content in the cast iron matrix and carbon concentration in austenite were measured after different times of the isothermal transformation on an X-ray diffractometer. The results of the investigations were presented in the form of tables, graphs and photographs of microstructure. The developed austempered grey iron(AGI) can be applied for numerous responsible parts of machines and equipment offering high abrasion wear resistance and filling a gap that exists between the grey and spheroidal graphite irons.
ausferritic iron austemperinq, microstructure mechanical properties
Adam Kowalski Jozef Turzynski
Foundry Research Institute, Zakopiaftska 73,Krakow, Poland
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
352-358
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）