scholarly journals Fatigue strength evaluation of a 13%Cr supermartensitic stainless steel by the thermographic method

2021 ◽  
Vol 349 ◽  
pp. 02019
Author(s):  
Sérgio S.M. Tavares ◽  
Bruna Abib ◽  
Paulo Kenedi ◽  
Odivaldo C. Alves ◽  
Brígida B. Almeida
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Fatigue Strength ◽  
Martensitic Stainless Steel ◽  
Heat Treatment Condition ◽  
Magnetic Methods ◽  
Treatment Conditions ◽  
Super Martensitic Stainless Steel ◽  
Dynamic Loadings ◽  
Hot Rolled

The fatigue limits of a 13Cr super-martensitic stainless steel from a hot rolled seamless tube were determined for three heat treatment conditions, including the as received quenched and tempered (QT) condition, quenched (Q), and quenched and double tempered (Q-DT). These heat treatments were applied to produce different microstructures and different tensile mechanical properties. The microstructures were characterized by microscopy and magnetic methods. The fatigue strength was accessed through the utilization of the thermographic technique. The results show that fatigue limits measured were between 38% and 44% of the ultimate strength. The as quenched condition gave the higher fatigue limit (444 MPa). However, the material has the lower dutility at this condition. The results aid to decide the best heat treatment condition and give support to design in applications where dynamic loadings are expected

Using GA–ANN to Optimize Heat Treatment Technological Parameters of Super-Martensitic Stainless Steel

2011 ◽  
Vol 695 ◽  
pp. 401-404
Author(s):  
Huan Liu ◽  
Jun Hui Yu ◽  
Duo Wang ◽  
De Ning Zou
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Stainless Steel ◽  
Martensitic Stainless Steel ◽  
Air Cooling ◽  
Technological Parameters ◽  
Super Martensitic Stainless Steel ◽  
Excellent Mechanical Property ◽  
Optimum Heat ◽  
Artificial Neural Network Ann

In this investigation a theoretical model based on artificial neural network (ANN) and genetic algorithm (GA) have been developed to optimize the heat treatment technological parameters for achieving the excellent mechanical property of super-martensitic stainless steel (SMSS). The ANN was used to correlate the heat treatment technological conditions to the mechanical property. The GA and ANN were incorporated to find the optimal technological parameters. The result shows that the most optimal heat treatment technological is 1003.9°C×0.5h (air cooling) +629.75°C+2.06h (air cooling). By comparing the prediction values with the experimental data it is demonstrated that the combined GA–ANN algorithm is efficient and strong method to find the optimum heat treatment technological for producing super-martensitic stainless steel.

Effect of Heat Treatment on Microstructure and Properties of Cr15 Super Martensitic Stainless Steel

2012 ◽  
Vol 581-582 ◽  
pp. 954-957
Author(s):  
Wen Jiang ◽  
Kun Yu Zhao ◽  
Dong Ye ◽  
Jun Li ◽  
Zhi Dong Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stainless Steel ◽  
Martensitic Stainless Steel ◽  
Lath Martensite ◽  
Reversed Austenite ◽  
Quenching Temperature ◽  
Austenite Grain Size ◽  
Tempering Temperature ◽  
Super Martensitic Stainless Steel

The microstructure and mechanical properties of Cr15 super martensitic stainless steel after different heat treatment were studied by SEM and XRD. The results show that the microstructure of steel A and B are lath martensite and retained austenite after quenching. The original austenite grain size increases with the increasing quenching temperature. The microstructure is composed by tempered martensite and reversed austenite after tempering. The amount of reversed austenite in both steels increases first and then decreases with the increasing tempering temperature. Both of the tested steels have the best mechanical properties at 650°C tempering temperature.

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