Predicting ADI mechanical properties
Journal Title: Archiwum Odlewnictwa - Year 2009, Vol 9, Issue 3
Abstract
Ductile cast iron was quench-hardened with the isothermal transformation according to two alternatives. The first treatment alternative consisted in the austenitizing process at temperature t = 830, 860 i 900°C and annealing at temperature tpi = 400, 350 and 300°C in a pe-riod of time up to 240 min. The second treatment alternative consisted in dual-stage austenitizing. The material was annealed in temperature of t= 950°C and cooled to temperature t’ = 900, 860 and 830°C. The isothermal transformation was performed in the same conditions as in the first alternative. The cast iron was ferritizingly annealed before the isothermal quench-hardening. The cast iron matrix after the annealing was ferritic. Metallographic cubic specimens with the size about of 10 mm were quench-hardened with the isothermal transformation. Matrix micro-structure, austenite percentage and Vicker’s hardness were determined using the specimens. Hardness test results were used to determine, on the base of material coefficients, tensile strength Rm, yield strength Rp0,2 and deformation A5. Tests showed that heat treatment according to two alternatives of the quench hardening led to obtain ADI cast iron with accordance to PN–EN 1564 : 2000 grade: EN-GJS-800-8, EN-GJS-1000-5, EN-GJS-1200-2. Only ausferritic cast iron was assumed as a base of qualifica-tion.
Authors and Affiliations
T. Giętka, S. Dymski
Keywords
Related Articles
- EP ID EP72090
- DOI -
- Views 120
- Downloads 0
Moulding Sands with New Inorganic Binders - Ecology Assessment in the Aspect of Work Environment
The development of economy and industry introducing new technologies and materials often means the increased threat of occurrence of factors harmful to humans and environment. Workers employed in foundries as mould poure...
Usage of Connor Inlets to Eliminate Shrinkage
The demand for castings of high quality and sound work is nowadays very high. The production of sound castings without foundry errors is the big issue in modern foundries. Foundry simulation software can do a lot to help...
Influence of Addition of Briquettes with Dust Content into the Charge of Electric Induction Furnace on Cast Iron Quality
Foundry dust from blasting and grinding of castings contain a high amount of iron, ergo it is possible its recycling in foundry process. Dust was compacted by briquetting, two kinds of briquettes were prepared (A contain...
Identification of temperature changes dynamics in selected castings as a contribution to performance life improvement
Parameters describing boundary conditions and dynamics of temperature changes during casting cooling in foundry moulds and the successive performance, especially as regards the massive cast elements, were discussed. Cons...
Morphology of graphite precipitates in austenitic ductile iron
The final mechanical properties of cast iron depend on the nature and properties of the matrix and on the morphology of graphite precipitates. The article presents the results of studies of the structure of austenitic du...