Predictions and Analyses on the Growth Behavior of Oxide Scales Formed on Ferritic–Martensitic in Supercritical Water

2019 ◽  
Vol 92 (1-2) ◽  
pp. 27-48 ◽  
Author(s):  
Yanhui Li ◽  
Tongtong Xu ◽  
Shuzhong Wang ◽  
Jie Yang ◽  
Balazs Fekete ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Growth Behavior ◽  
Oxide Scales

scholarly journals Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water

2021 ◽  
Vol 40 (1) ◽  
pp. 53-65
Author(s):  
Li Sun ◽  
Weiping Yan
Keyword(s):  
Diffusion Coefficient ◽  
Oxide Scale ◽  
Supercritical Water ◽  
Heating Surface ◽  
Oxidation Mechanism ◽  
Oxygen Activity ◽  
Oxide Scales ◽  
Spinel Layer ◽  
Magnetite Layer ◽  
Iron Diffusion

Abstract More attention has been paid to the exfoliation of oxide scale on high-temperature heating surface of utility boiler. The oxidation mechanism of HCM12A steel in supercritical water is proposed and the growth of oxide film is simulated. The duplex scale contains an outer magnetite layer and an inner Cr-rich spinel layer. According to the data of Backhaus and Töpfer, the diffusion coefficient values of iron in magnetite layer are discussed and the function of R V, R I {R}_{\text{I}} for oxygen activity can be used for calculation of iron diffusion coefficients in Cr-rich spinel layer. Based on Wagner’s oxidation theory, the oxidation rate constants of HCM12A are calculated at 500 and 600°C in supercritical water, compared with experimental data of the relevant literatures. The oxygen activities at the interfaces of alloy/Cr-rich spinel oxide and magnetite/supercritical water are estimated. The simulation results of weight gain are matched with the test data. The iron diffusion mechanisms inside the magnetite layer and the Cr-rich spinel layer are analyzed. The iron diffusion coefficient at the interface of Cr-rich spinel/magnetite is discontinuous, while the oxygen activity is continuous in the whole double layer. The thickness of oxide scale on inner tube walls of the final superheater coils (T91) of a 600 MW supercritical boiler is calculated by using the calculation method provided by the paper. The modeling results, the measured data, and the calculation results by the method are compared. Accurate calculation of the thickness of the inner and outer oxide scales can provide a necessary basis for predicting the stress and exfoliation of oxide scales.

Characterization of oxide scales formed on heating equipment in supercritical water gasification process for producing hydrogen

2019 ◽  
Vol 44 (56) ◽  
pp. 29508-29515 ◽  
Author(s):  
Yanhui Li ◽  
Tongtong Xu ◽  
Shuzhong Wang ◽  
Jianqiao Yang ◽  
Jianna Li ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Oxide Scales ◽  
Heating Equipment ◽  
Gasification Process ◽  
Supercritical Water Gasification

Comparison of the stress corrosion cracking growth behavior of cold worked Alloy 690 in subcritical and supercritical water

2019 ◽  
Vol 520 ◽  
pp. 235-244 ◽  
Author(s):  
Kai Chen ◽  
Jiamei Wang ◽  
Zhao Shen ◽  
Donghai Du ◽  
Xianglong Guo ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Supercritical Water ◽  
Stress Corrosion Cracking ◽  
Growth Behavior ◽  
Corrosion Cracking ◽  
Alloy 690 ◽  
Cold Worked

A comparative study of oxide scales grown on stainless steel and nickel-based superalloys in ultra-high temperature supercritical water at 800 °C

2016 ◽  
Vol 106 ◽  
pp. 188-207 ◽  
Author(s):  
Yashar Behnamian ◽  
Amir Mostafaei ◽  
Alireza Kohandehghan ◽  
Babak Shalchi Amirkhiz ◽  
Dominic Serate ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Comparative Study ◽  
Supercritical Water ◽  
Oxide Scales ◽  
Ultra High Temperature

Investigation on early formation and evolution of oxide scales on ferritic–martensitic steels in supercritical water

2018 ◽  
Vol 135 ◽  
pp. 136-146 ◽  
Author(s):  
Yanhui Li ◽  
Shuzhong Wang ◽  
Panpan Sun ◽  
Jiaoqiao Yang ◽  
Xingying Tang ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Oxide Scales ◽  
Martensitic Steels ◽  
Early Formation ◽  
Formation And Evolution

Effects of dissolved oxygen on the oxide scales formed on ferritic-martensitic steel T12 exposed to supercritical water

2020 ◽  
Vol 167 ◽  
pp. 108516 ◽  
Author(s):  
Xiangyu Zhong ◽  
Fethi Hamdani ◽  
Jian Xu ◽  
Tetsuo Shoji ◽  
Tadashi Tatsuki ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Supercritical Water ◽  
Martensitic Steel ◽  
Oxide Scales

Corrosion of engineering materials in a supercritical water cooled reactor: Characterization of oxide scales on Alloy 800H and stainless steel 316

2015 ◽  
Vol 100 ◽  
pp. 222-230 ◽  
Author(s):  
Kashif I. Choudhry ◽  
Shooka Mahboubi ◽  
Gianluigi A. Botton ◽  
Joseph R. Kish ◽  
Igor M. Svishchev
Keyword(s):  
Stainless Steel ◽  
Supercritical Water ◽  
Oxide Scales ◽  
Alloy 800H ◽  
Engineering Materials ◽  
Stainless Steel 316 ◽  
Supercritical Water Cooled Reactor

The characterization of oxide scales formed on ferritic-martensitic steel in supercritical water with dissolved oxygen

2020 ◽  
Vol 174 ◽  
pp. 108810
Author(s):  
Zhongliang Zhu ◽  
Ruitao Li ◽  
Xiao Liu ◽  
Hasan Izhar Khan ◽  
Hong Xu ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Supercritical Water ◽  
Martensitic Steel ◽  
Oxide Scales

Characterization of oxide scales grown on alloy 310S stainless steel after long term exposure to supercritical water at 500 °C

2016 ◽  
Vol 120 ◽  
pp. 273-284 ◽  
Author(s):  
Yashar Behnamian ◽  
Amir Mostafaei ◽  
Alireza Kohandehghan ◽  
Babak Shalchi Amirkhiz ◽  
Daniel Serate ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Supercritical Water ◽  
Oxide Scales

scholarly journals Estimation of Oxidation Kinetics and Oxide Scale Void Position of Ferritic-Martensitic Steels in Supercritical Water

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Li Sun ◽  
Weiping Yan
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Oxide Scale ◽  
Supercritical Water ◽  
Oxidation Kinetics ◽  
Ternary Phase Diagram ◽  
Measurement Data ◽  
Oxide Scales ◽  
Martensitic Steels ◽  
Iron Diffusion

Exfoliation of oxide scales from high-temperature heating surfaces of power boilers threatened the safety of supercritical power generating units. According to available space model, the oxidation kinetics of two ferritic-martensitic steels are developed to predict in supercritical water at 400°C, 500°C, and 600°C. The iron diffusion coefficients in magnetite and Fe-Cr spinel are extrapolated from studies of Backhaus and Töpfer. According to Fe-Cr-O ternary phase diagram, oxygen partial pressure at the steel/Fe-Cr spinel oxide interface is determined. The oxygen partial pressure at the magnetite/supercritical water interface meets the equivalent oxygen partial pressure when system equilibrium has been attained. The relative error between calculated values and experimental values is analyzed and the reasons of error are suggested. The research results show that the results of simulation at 600°C are approximately close to experimental results. The iron diffusion coefficient is discontinuous in the duplex scale of two ferritic-martensitic steels. The simulation results of thicknesses of the oxide scale on tubes (T91) of final superheater of a 600 MW supercritical boiler are compared with field measurement data and calculation results by Adrian’s method. The calculated void positions of oxide scales are in good agreement with a cross-sectional SEM image of the oxide layers.

Sign in / Sign up

Export Citation Format

Share Document