Influence of hammer peening on fatigue life of E309L steel used for 13%Cr-4%Ni blade runner repairs

被引：4

作者：

Curtat, Jean-Loup ^{[1
]}

Lanteigne, Jacques ^{[2
]}

Champliaud, Henri ^{[1
]}

Liu, Zhaoheng ^{[1
]}

Levesque, Jean-Benoit ^{[2
]}

机构：

[1] ETS, Dept Mech Engn, Montreal, PQ, Canada

[2] Inst Rech Hydroquebec IREQ, Varennes, PQ, Canada

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2017年 / 100卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Robotized hammer peening; Fatigue strength improvement; Residual stress; Stainless steel; STRENGTH IMPROVEMENT; RESIDUAL-STRESSES; WELDED-JOINTS; CONTOUR;

D O I：

10.1016/j.ijfatigue.2017.03.007

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Austenitic stainless steel E309L is frequently used for welded repairs on 13%Cr-4%Ni martensitic stainless steel blade runners. However, very high tensile residual stresses are found in the upper layers of these repairs, thus reducing the fatigue resistance of the repaired area in comparison with the free of residual stress base material. The use of hammer peening to increase the fatigue life of E309L welded on UNS-S41500 base metal plates has been investigated using welded samples replicating in situ blade runner repairs. Residual stress measurements using the contour method on these samples have confirmed the high stresses caused by flux cored arc welding (FCAW) of E309L, leaving stress magnitudes close to the ultimate tensile strength of the base material. Hammer peening of the surface beads effectively creates high compressive stresses at the weld's surface up to 3 mm depth. Alternating bending fatigue tests conducted on hammer peened samples have shown an average life increase of 5.8 times at S-a = 330 MPa over unpeened samples. Fatigue tests have however shown diminishing returns when overpeening the samples. (C) 2017 Published by Elsevier Ltd.

引用

页码：68 / 77

页数：10

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