Effect of graphite nodule diameter on water embrittlement of austempered ductile iron

被引：0
作者：
Cai, QZ [1 ]
Wei, BK
Tanaka, Y
机构：
[1] Huazhong Univ Sci & Technol, Wuhan 430074, Peoples R China
[2] Muroran Inst Technol, Muroran, Hokkaido 0508585, Japan
来源：
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2005年 / 12卷 / 03期
关键词：
austempered ductile iron; water embritttlement; graphite nodule diameter; tensile property;
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Effects of graphite nodule diameter on the water embrittlement of austempered ductile iron (ADD is studied. The water embrittlement mechanism is discussed. Due to water adhesion, local embrittlement occurs on the surface of ADI specimen, resulting in early fracture and significant reduction in tensile strength and elongation. The water embrittlement is the cracking of stress induced martensite formed during tensile deformation caused by hydrogen diffusion decomposed from water and as a result tensile strength and elongation of ADI are remarkably reduced. The segregation of alloying elements in ductile iron is weakened with decreasing nodule diameter, reducing the residual austenite in grain boundaries, then decreasing the amount of stress induced martensite during tensile plastic deformation and finally restraining ADI water embrittlement.
引用
收藏
页码：40 / 45
页数：6
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