Microstructural development and austempering kinetics of ductile iron during thermomechanical processing

被引：27
作者：
Achary, J [1 ]
Venugopalan, D [1 ]
机构：
[1] Univ Wisconsin, Dept Mat, Milwaukee, WI 53211 USA
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2000年 / 31卷 / 10期
关键词：
Ferrite; Austenite; Material Transaction; Prior Austenite; Ductile Iron;
D O I：
10.1007/s11661-000-0202-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A new method of refining the microstructure of austempered ductile iron (ADI) by thermomechanical processing is investigated. Refinement of microstructure is effected by grain refinement of parent austenite by hot deformation in the austenitizing temperature range, before the austempering treatment. The effects of austenite deformation on the kinetics of austempering reaction and the microstructure development were studied using metallography and X-ray diffraction (XRD), at different austempering temperatures and deformations. The process window for optimum microstructure was determined in terms of the parameters involved. Deformation of 40 to 60 pet could be imparted in the temperature range 900 degrees C to 1025 degrees C, resulting in a reduction in the prior austenite grain size by 35 to 50 pet and ferrite size in ausferrite by 70 to 75 pet. The effects of austenitization temperature on the austempered microstructure were also studied.
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收藏
页码：2575 / 2585
页数：11
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