Deformation and fracture behavior of the P91 martensitic steel at high temperatures
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- 作者：Filip Siska ; siska@ipm.cz" class="auth_mail" title="E-mail the corresponding author ; Ludek Stratil ; Miroslav Smid ; Natalia Luptakova ; Tomas Zalezak ; Denisa Bartkova
- 关键词：Steel ; Plasticity ; Stress relaxation ; Dislocations
- 刊名：Materials Science & Engineering A
- 出版年：2016
- 出版时间：30 August 2016
- 年：2016
- 卷：672
- 期：Complete
- 页码：1-6
- 全文大小：1828 K
文摘
The stress relaxation behavior of the P91 martensitic steel is tested for the temperature range 400–600 °C in order to investigate the plastic deformation and fracture processes. The repeated relaxation tests are performed on the tensile specimens at the stress level of 95% of the ultimate tensile stress. The deformation mechanisms are analyzed in terms of an activation volume, dislocation density and velocity, a thermal stress component and a strain rate hardening. The deformation is driven by the dislocation glide. Short range interactions between dislocations and a lattice become dominant at the studied temperature range. The dislocations are able to overcome a pinning effect by the thermal activation at 600 °C.