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.

scholarly journals Effect of austenitising heat treatment on microstructure and properties of a nitrogen bearing martensitic stainless steel

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 601-606 ◽  
Author(s):  
Xiao Li ◽  
Yinghui Wei
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Stainless Steel ◽  
Retained Austenite ◽  
Martensitic Stainless Steel ◽  
Optimum Combination ◽  
Holding Time ◽  
Air Cooling ◽  
Metal Release ◽  
Scanning Electron

Abstract The effect of austenitising heat treatment on the microstructure, hardness and metal release of the nitrogen bearing, martensitic stainless steel 420U6 was investigated. The heat treatment was carried out at temperatures between 950 to 1,150∘C with a holding time between 30 to 120min, followed by air cooling. The quenched microstructures observed by a scanning electron microscope indicated that by increasing the austenitising temperature and holding time, the number of carbides decreases while the grain size and the amount of retained austenite increases. For a given holding time, the hardness increases to a peak and then decreases continuously with the increase of temperature. The metal release test, according to the GB 4806.9-2016 standard, reveals that the metal release concentration is highly affected by the austenitising temperature. The parameters of the austenitising heat treatment, which can achieve the optimum combination of hardness and metal release, were obtained.

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

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.

scholarly journals Pengaruh Perlakuan Panas Quenching dan Tempering terhadap Laju Korosi pada Baja AISI 420

2017 ◽  
Vol 1 (2) ◽  
pp. 19
Author(s):  
Sotya Anggoro
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Corrosion Rate ◽  
Base Material ◽  
Air Cooling ◽  
Corrosion Resistant ◽  
A Value ◽  
Aisi 420 ◽  
Quenching Process ◽  
Cooling Media

<p>Corrosion occurs in almost all metals. Even corrosion-resistant metals are corroded, but their corrosion rate is different from ordinary or non-corrosion resistant metals. This study examines the corrosion rate that occurs in stainless steel that is stainless steel. Stainless steel contains high enough chromium levels that can reduce the rate of corrosion that occurs. The metal material to be studied is the AISI 420 steel, which belongs to the Martensitic Stainless Steel class. This study examined the effect of heat treatment on corrosion rate and hardness level of AISI 420 steel. The heat treatment carried out was Quenching at 1020<sup>o</sup>C with a holding time of 60minutes with an oil cooling medium. After quenching the subsequent heat treatment is tempering with temperature variations of temperature 200<sup>o</sup>C and 300<sup>o</sup>C with a resistance time of 45 minutes and air cooling media. The results of this study showed that the base material specimens had the highest corrosion rate of 0.569 mm/y. The lowest corrosion rate is in specimens with quenching process with a value of 0.267 mm/y. The highest Vickers hardness values were found in specimens with quenching process with a value of 551 kg/mm<sup>2</sup>. The lowest hardness value is in the specimen with tempering process at 300<sup>o</sup>C with 405 kg/mm<sup>2</sup>.</p>

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