The role of creep and fatigue in determining the high-temperature behaviour of AISI H11 tempered steel for aluminium extrusion dies

被引:19
|
作者
Reggiani, B. [1 ]
Donati, L. [1 ]
Zhou, J. [2 ]
Tomesani, L. [1 ]
机构
[1] Univ Bologna, DIEM Dept, ALMA MATER STUDIORUM, I-40136 Bologna, Italy
[2] Delft Univ Technol, Dept Mat Sci & Engn, NL-2628 CD Delft, Netherlands
关键词
Creep; Fatigue; Creep-fatigue interaction; AISI H11 tool steel; Extrusion die; DESIGN; MODEL;
D O I
10.1016/j.jmatprotec.2010.05.009
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present study was aimed to analyze the effect of loading cycles on the behaviour of the AISI H11 tool steel commonly used for aluminium extrusion dies working at high temperatures and under high, cyclic stresses. A technological test method in which the specimen geometry resembled the mandrel of a hollow extrusion die was developed. Finite element analyses were performed to aid in determining specimen geometry and dimensions as well as the levels of stress to be applied to the specimen so as to replicate the conditions typically encountered by industrial hollow extrusion dies. Tests were performed on a Gleeble thermomechanical simulator by heating the specimen using Joule's effect and by applying loading for up to 6.30h or till specimen failure. Displacements during the tests at 380, 490, 540 and 580 degrees C and under the average stresses of 400, 600 and 800 MPa were determined. The specimens were tested under creep (with the load held at a fixed value), fatigue (cyclic loading) and creep-fatigue (cyclic loading with a 3 min dwell-time) loading, thereby allowing a direct comparison between different deforming mechanisms. The results showed that the test could physically simulate the cyclic loading on the hollow die during aluminium extrusion and that the creep condition represented the most severe working condition. In addition, the tests could reveal the interaction between creep and fatigue mechanisms. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:1613 / 1623
页数:11
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