Wear Resistance Properties of Austempered Ductile Iron

Lerner, Yury S.; Kingsbury, George R.

doi:10.1361/105994998770348034

Cited by 30 publications

(2 citation statements)

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“…With the development of austempered ductile iron in recent years, many researchers [7][8][9][10] concluded that ductile iron after austempering heat treatment significantly improved its mechanical properties, including strength, hardness, toughness, wear, and fatigue resistance. For the other irons such as gray irons and compact graphite irons, austempering treatment has also been performed and yielded analogous results.…”

Section: Introductionmentioning

confidence: 99%

Effects of Copper and Malleablizing Time on Mechanical Properties of Austempered Malleable Iron

Hsu

Chen

2007

Metall Mater Trans A

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In this study, both the unalloyed and 1 wt pct copper alloyed white irons were successively treated with a duplex heating process consisting of malleablizing and austempering, and then the effects of copper and processing variables on microstructure and mechanical properties of the austempered malleable iron (AMI) were investigated. The results showed that AMI could effectively shorten malleablizing time to obtain the constituents of irregular graphite, acicular ferrite, and retained austenite in the microstructure. Moreover, 1 pct Cu-AMI had a higher retained austenite content than unalloyed AMI. This is because copper is an austenite stabilizer and acts to delay the start of the transformation into ausferrite. In the case of mechanical properties, AMI increased tensile strength (1083 to 1190 MPa) and impact toughness (16 to 22 J) by 2 to 3 times after 930°C-20 hours malleablizing treatment as compared to as-cast (572 to 580 MPa and 5 to 6 J). In particular, 1 pct Cu-AMI had better performance than unalloyed AMI except for hardness. In comparison with conventional malleable irons, AMI was found to possess better tensile and impact properties.

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Section: Introductionmentioning

confidence: 99%

Effects of Copper and Malleablizing Time on Mechanical Properties of Austempered Malleable Iron

Hsu

Chen

2007

Metall Mater Trans A

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“…lent mechanical properties together with wear resistance and has been subjected to extensive research in recent years. [1][2][3][4][5][6] B. Heat Treatment Despite the similarity of austempering heat treatments between steel and cast iron, yet because of the difference This experiment adopted the two-step HLAT concept, [16,18] in microstructural constituents, the resulting phase for steel is as wear resistance (which is better for lower ausferrite) is termed "bainite" while that for iron is termed "ausferrite."…”

Section: Introductionmentioning

confidence: 99%

Influence of stepped austempering process on the fracture toughness of austempered ductile iron

Hsu

Chuang

2001

Metall Mater Trans A

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This research studied the effect of a two-step austempering process on the fracture toughness of ductile iron and compared it to that of the conventional upper-and lower-ausferrite austempered ductile irons (ADIs). The results showed that such a two-step austempering heat-treatment process yielded a fracture-toughness value equivalent to that of the upper-ausferrite ADI, while the hardness was maintained at the level of lower-ausferrite ADI. This provided a unique combination of high toughness with good hardness (strength) properties for the ADI with a two-step austempering. Optical microscopy, scanning electron microscopy (SEM), and X-ray diffraction analysis were performed to correlate the properties attained to the microstructural features.

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