Effect of initial microstructure on surface relief and fatigue crack initiation in AISI 410 ferritic-martensitic steel

被引：17
作者：
Batista, M. N. [1 ]
Marinelli, M. C. [1 ]
Alvarez-Armas, I. [1 ]
机构：
[1] UNR, CONICET, Consejo Nacl Invest Cient & Tecn, Inst Fis Rosario IFIR, Bv 27 Febrero 210 Bis Esmeralda & Ocampo, Rosario, Santa Fe, Argentina
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2019年 / 42卷 / 01期
关键词：
EBSD; ferritic-martensitic steel; low cycle fatigue; microcrack nucleation; microstructure; LOW-CYCLE FATIGUE; EUROFER; 97; BEHAVIOR;
D O I：
10.1111/ffe.12868
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
This work is focused on the effect of the initial tempered-lath microstructure on the surface relief and nucleation of microstructurally short fatigue cracks developed during low-cycle fatigue tests of the ferritic-martensitic AISI 410 steel. Transmission and scanning electron microscopy as well as electron back-scattered diffraction were used to study the surface-damage evolution in smooth, cylindrical, notched specimens. Results from the electron back-scattered diffraction analysis broaden the understanding of the processes of nucleation of microstructurally short fatigue cracks in the initial tempered-lath microstructure of AISI 410 ferritic-martensitic steels. Results prove that during fatigue, microcracks nucleate mainly at high-angle boundaries represented by block subunit interfaces formed in this tempered microstructure. Besides, the progress of fatigue cycling causes the reorientation of the {112} systems to a direction more favourable to slip, giving rise to the formation of extrusions within the blocks and consequently the formation of microcracks.
引用
收藏
页码：61 / 68
页数：8
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