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Analysis of Creep Crack Growth of P92 Steel with Residual Stress

Author: ZhangXing
Tutor: JingHongYang
School: Tianjin University
Course: Materials Processing Engineering
Keywords: P92 steel Residual stress Pre-compression Finite Element Simulation Crack propagation C *
CLC: TG142.15
Type: Master's thesis
Year: 2010
Downloads: 109
Quote: 1
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Abstract


Into the 21st century , China's sustained high-speed development , but also facing the enormous pressure of the energy and environment , and the most effective means to improve the energy efficiency and material conversion efficiency is to improve the plant 's operating parameters . In this situation , the new high-temperature alloy P92 steel , which has been widely used in the construction of ultra-supercritical power plant running high temperature . However, due to the manufacturing process of the high temperature member , including casting , the manufacturing process of the bending, welding , etc. , as well as during the operation of the load and the temperature gradient will result in the member which inevitably produce residual stress , thereby reducing the carrying capacity of the high temperature member and fracture toughness . Therefore, to study the high temperature creep expansion of P92 steel under the residual stress will ensure the safe operation of the power station and life assessment provides the basis . This article by the pre- compression test specimen notch tip in the CT1 introduces the tensile residual stress field , and the conjunction of the sample and not pre-compressed the CT3 sample in the 650 ° C high temperature creep crack growth experiments , used to study the impact of the residual stress of the high-temperature creep crack growth . By elastoplastic - creep finite element analysis model to simulate the stress relaxation process with a pre-compression method generates the residual stress and the subsequent creep in ABAQUS . The experimental results show that , when not considering the residual stress in the initial 450 hours of the crack propagation and creep crack almost does not extend ; early creep crack will occur when the residual stress , and expansion rate with increasing creep time continue to decrease , which is mainly caused due to the continuous decrease in the residual stress during creep . C * calculation of the reference stress - based methods , describe the creep crack growth in residual stress , a conservative estimate of the crack propagation .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel > Microstructure and properties of steel > Analysis of the steel test
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