The effect of matrix structure on the fatigue behavior of austempered ductile iron
The effect of matrix structure on the fatigue behavior of austempered ductile iron
复制标题
DOI：
10.1016/j.matdes.2005.11.010
复制
发表时间：
2007
影响因子：
8.4
通讯作者：
Mustafa Tayanç;K. Aztekin;A. Bayram
中科院分区：
文献类型：
--
作者：
Mustafa Tayanç;K. Aztekin;A. Bayram
本研究的主要目的是研究等温淬火非合金球墨铸铁的疲劳行为。将球墨铸铁试样在900℃奥氏体化110min，然后一组试样在230、330、430℃等温淬火60min，另一组试样在330℃等温淬火30、60、120min以获得不同的显微组织。对球墨铸铁和等温淬火试样进行旋转弯曲试验（1000万次循环），选择完全反向的应力循环（R=最小应力/最大应力=-1）。贝氏体结构（奥铁素体）的疲劳强度最高。等温淬火球墨铸铁结构中马氏体或碳化物相的存在会降低疲劳强度。
The primary objective of this study has been to investigate the fatigue behavior of the austempered unalloyed ductile iron. Ductile iron specimens were austenized at 900°C for 110min and then one group specimens were austempered at 230, 330, 430°C for 60min, and another one group specimens were austempered at 330°C for 30, 60, 120min to obtain different microstructures. Rotating bending tests (10 million cycles) were conducted on the ductile iron and the austempered specimens selecting completely reversed cycle of stress (R=minimum stress/maximum stress=−1). The highest fatigue strength was found in the bainitic structure (ausferritic). The presence of martensite or carbide phases in the structure of austempered ductile iron reduces the fatigue strength.