Development of wear resistant carbidic austempered ductile iron (CADI)

Wear Behavior of CADI Operating Under Different Tribosystems

“…The first studies on CADI were undertaken by researchers from the American company Applied Process, who obtained and characterized two variants of this material, particularly evaluating its laboratory abrasion resistance (pin on disk and ASTM G 105 abrasion tests), and compared it to that of traditional abrasion resistant materials such as steels and cast irons. 15,16) Previous works by the authors 17,18) have dealt with different CADI variants, in which carbide precipitation was obtained by alloying with chromium contents between 0.5 and 2.5 wt% in almost eutectic compositions, combined with a chill in the mould to vary the solidification rate. A hypoeutectic composition was also analyzed.…”

“…The chromium content and the austempering temperature used were selected so that the hardness obtained were as similar as possible to that of the original screws (ϳ560 HBW 2.5/187.5 ) made of martensitic cast alloyed steel, and used as reference material in the trials. 17) The wear scar of a worn screw and the absence of impact loads in this application were also considered.…”

“…Two heats were alloyed with 1.0 % Cr and 2.0 % Cr (C4 and C2, respectively, in Table 1) and used to produce CADI edges, one with low carbide content and the other with a significantly higher amount of carbides. 17) Another heat without Cr (C5 in Table 1) was employed to obtain the ADI edges used as a reference trial material. The austempering temperature selected was Taϭ300°C in all cases.…”

Karbürlü östemperlenmiş küresel grafitli dökme demirler

“…Laino ve arkadaşları [5] ÖKGDD'in yapısında karbür bulunduğunda aşınma direncinin aynı sıcaklıkta östemperlenen geleneksel ÖKGDD'e göre %100 oranında artış gösterebileceğini ifade etmişlerdir. Cheng ve arkadaşları [6], östemperleme tuz banyosuna değişik oranlarda (%0-%3) çeşme suyu ilave ederek soğuma hızının iç yapıya etkisini incelemişlerdir.…”

Development and Characterization of a New Type of Ductile Iron with a Novel Multi-phase Microstructure

“…4,5) The presence of carbides reinforces the matrix against abrasive particles penetration, reducing impact toughness at the same time. [4][5][6] Carbide precipitation concerning CADI production can be promoted in different ways, such as by controlling the chemical composition (in order to decrease the interval between the stable and metastable equilibrium diagrams), the solidification rate, or both. 7,8) Then, the amount of carbides and matrix microconstituents can be controlled by selecting the chemical composition and heat treatment parameters, respectively.…”