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Stress Corrosion Cracking of pressure vessel steel and Countermeasures by Titanium-Based & Cerium-Based Inhibitors in Subcritical Aqueous Environment

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Journal of Rare Earths 2003年第S1期21卷 1-4页

作者：沈长斌韩冬云杨怀玉王福会 State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences

An overview of a severe kind of environmentally-assisted cracking-stress corrosion cracking (SCC) of pressure vessel steel (PVS),such as stainless steel 304, alloy 600,690 and other nickel-based alloys in subcritical (～300 ℃) aqueous environment was given. The mechanisms of SCC of metals under this inclement surrounding were briefly generalized. Herein,some pragmatic solutions to mitigate the SCC susceptibility and retard its propagation were presented. The titanium and cerium-based inhibitors addition countermeasure was highlighted.

关键词： pressure vessel steel subcritical aqueous environment stress corrosion titanium & cerium-based inhibitors-addition rare earths

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INVESTIGATION OF INFLUENCE OF HYDROGEN ATTACK ONFATIGUE PROPERTIES OF pressure vessel steelS

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Acta Metallurgica Sinica(English Letters) 1998年第2期11卷 141-149页

作者： J.L.Li K.F.Wang J.Li Z.M.Yao W.Ke Fushun Petroleum Inst Fushun China

Influence of hydrogen attack on mechanical and fatigue properties of 1020, 15CrMo and 2.25Cr-1Mo steels has been studied, which were exposed to gaseous hydrogen at pressure of 18MPa and 300-480℃ for up to 480h. The results of fatigue test showed that hydrogen attack (HA) resulted in an obvious change in fatigue properties of 1020 and 15CrMo steels, however, 2.25Cr-1Mo steel showed a lower susceptibility to hydrogen attack due to the addition of Cr and Mo. Fatigue crack behaviour for 1020 steel is attributed to hydrogen attack damage and the crack closure induced by the rough cracking surface, which lead to a valley on △Kth～HA% plot. The change in the fatigue behaviour of 15CrMo steel is possibly caused by severe surface decarburization.

关键词： hydrogen attack pressure vessel steel threshold △K value crack closure

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Flow stress behavior and constitutive modeling of 20MnNiMo low carbon alloy

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Journal of Central South University 2016年第8期23卷 1863-1872页

作者：王梦寒王根田王瑞 School of Materials Science and Engineering Chongqing University

The hot deformation behavior of 20 Mn Ni Mo low carbon alloy was investigated by isothermal compression tests over wide ranges of temperature(1223-1523 K) and strain rate(0.01-10 s^(-1)). According to the experimental true stress-true strain data, the constitutive relationships were comparatively studied based on the Arrhenius-type model, Johnson-Cook(JC) model and artificial neural network(ANN), respectively. Furthermore, the predictability of the developed models was evaluated by calculating the correlation coefficient(R) and mean absolute relative error(AARE). The results indicate that the flow stress behavior of 20 Mn NiM o low carbon alloy is significantly influenced by the strain rate and deformation temperature. Compared with the Arrhenius-type model and Johnson-Cook(JC) model, the ANN model is more efficient and has much higher accuracy in describing the flow stress behavior during hot compressing deformation for 20 Mn Ni Mo low carbon alloy.

关键词： pressure vessel steel flow stress behavior constitutive model Arrhenius model Johnson-Cook model

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