Influence of ferritic nitrocarburizing on the high-temperature corrosion-fatigue properties of the Si-Mo-Al cast iron SiMo1000

被引：10
|
作者：
Xiang, Shengmei [1 ]
Jonsson, Stefan [1 ]
Hedstrom, Peter [1 ]
Zhu, Baohua [2 ]
Odqvist, Joakim [1 ]
机构：
[1] KTH, Royal Inst Technol, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden
[2] Scania CV AB, Mat Technol, S-15187 Sodertalje, Sweden
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2021年 / 143卷
关键词：
Corrosion fatigue; Cast iron; High temperature; Controlled atmosphere; Ferritic nitrocarburizing; THERMOMECHANICAL FATIGUE; BEHAVIOR; NITRIDE; ALLOYS;
D O I：
10.1016/j.ijfatigue.2020.105984
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The influence of ferritic nitrocarburizing on the high-temperature corrosion-fatigue properties of the Si-Mo-Al cast iron SiMo1000 is investigated in the present study. It was found that nitrocarburizing effectively increases the surface hardness, but dramatically decreases the fatigue and oxidation resistance of SiMo1000. The fatigue resistance is reduced due to two types of microcracks formed after nitrocarburizing. The oxidation resistance is dramatically diminished due to the formation of microcracks, and the depletion of aluminum in the matrix from nitride precipitation during the exposure at 800 degrees C. The corrosion-fatigue synergy is found to cause severe decarburization (i.e. graphite depletion) in nitrocarburized SiMo1000.
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页数：14
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