Effect of Intercritical Austenitizing Temperature during Quenching–Intercritical Quenching–Tempering Process on Toughness of 25Mn2Si2Cr Bainitic Steel

2019 ◽  
Vol 90 (6) ◽  
pp. 1800573 ◽  
Author(s):  
Ji Li ◽  
Zhunli Tan ◽  
Min Zhang ◽  
Guhui Gao ◽  
Raja Devesh Kumar Misra ◽  
...  
Keyword(s):  
Bainitic Steel ◽  
Austenitizing Temperature ◽  
Intercritical Austenitizing ◽  
Tempering Process

scholarly journals Effect of Different Parameters of Quenching and Tempering Process on SS410 Grade Martensitic Stainless Steel

2021 ◽  
Vol 9 (VII) ◽  
pp. 2712-2721
Author(s):  
Priya Narsale
Keyword(s):  
Stainless Steel ◽  
Martensitic Stainless Steel ◽  
Air Cooling ◽  
Austenitizing Temperature ◽  
Quenching Rate ◽  
Tempering Temperature ◽  
Temperature Ranges ◽  
General Material ◽  
Quenching And Tempering ◽  
Tempering Process

This paper reports the influence of different chemical composition, austenitizing temperature, quenching rate and tempering temperature on the mechanical properties and microstructure of martensitic stainless-steel SS 410 grade. For calculating general material properties such as hardness and yield strength of SS 410 grade, JMatpro software is used. Analysis of SS 410 grade has been done for austenitizing temperature ranging from 9250C to 10100C followed by tempering whose temperature ranges from 2050C to 6050C.The proper practices of quenching and tempering should be performed ensuring the suitable microstructure of the steels. To get fully Martensite, quenching has to be done at least at 0.40C/s or more than that. The results also shows that composition of carbon has great effect on transition temperature Ms and Mf of martensitic stainless steel 410 grade as compared to chromium. Air cooling or oil quenching this type steels from austenite phase results in microstructure consists of mainly hard and brittle martensite, small amount of retained austenite. Subsequent tempering process reduces hardness and increases ductility and toughness.

scholarly journals Effect of Isothermal Transformation Times below Ms and Tempering on Strength and Toughness of Low-Temperature Bainite in 0.53 C Bainitic Steel

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2418
Author(s):  
Enzuo Liu ◽  
Qiangguo Li ◽  
Sufyan Naseem ◽  
Xuefei Huang ◽  
Weigang Huang
Keyword(s):  
Low Temperature ◽  
Impact Toughness ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Isothermal Transformation ◽  
Electron Back Scatter Diffraction ◽  
Bainitic Steel ◽  
Transmission Electron ◽  
The Impact ◽  
Tempering Process

This study aims to investigate the microstructures, strength, and impact toughness of low-temperature bainite obtained by isothermal transformation at temperature below Ms (Martensite Starting temperature) for different times and tempering process in 0.53 C wt% bainitic steel. By using the optical microscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), electron back scatter diffraction (EBSD), and mechanical property test, it was found that the microstructures after heat treatment consist of small amounts of martensite, fine bainite, and film retained austenite. After tempered at 250 °C for 2 h, the volume fraction of retained austenite (10.9%) in the sample treated by isothermal transformation at 220 °C for three hours is almost the same as that of the sample without tempering. In addition, the retained austenite fraction decreases with the increase of holding times and is reduced to 6.8% after holding for 15 h. The ultimate tensile strength (1827 MPa), yield strength (1496 MPa), total elongations (16.1%), and impact toughness (up to 58 J/cm2) were obtained by isothermal transformation at 220 °C for three hours and tempered at 250 °C. Whereas, the impact toughness of sample without tempering is 28 J/cm2. After holding for 15 h, the impact toughness raises to 56 J/cm2, while the ductility and strength decreases. These results indicate that the tempering process is helpful to improve the impact toughness of low-temperature bainite.

The Tempering on Microstructure and the Yield-to-Tensile Ratio of High Performance Steels

2012 ◽  
Vol 535-537 ◽  
pp. 655-658
Author(s):  
Xue Min Wang ◽  
Hui Zhao
Keyword(s):  
High Performance ◽  
Lath Martensite ◽  
Yield Ratio ◽  
Bainitic Steel ◽  
Low Carbon ◽  
Considerable Influence ◽  
Austenitic Phase ◽  
Tempering Temperature ◽  
Low Temperature Toughness ◽  
Tempering Process

The effects of tempering temperature on the microstructure and mechanical properties of 600MPa grade low carbon bainitic steel were investigated. The cause for the microstructure evolution has been investigated and the best tempering process was chosen to decrease the yield ratio of the steel. The influence of tempering process on the yield-to-tensile ratio of steels has been investigated by the aid of optical microscopy, SEM and XRD. The results show that after the TMCP processing the microstructure of steels mainly consist of lath martensite and bainite. The bainite and martensite have been refined markedly after the relaxation processing, therefore the properties of steels has been improved evidently. In order to decrease the yield-to-tensile ratio the steels underwent high temperature tempering. It has been found that during the tempering with the tempering temperature increased the yield-to-tensile ratio of steels decreased. The XRD and EBSD results show tempering temperature has considerable influence on the yield strength, but the influence on the tensile strength is not considerable. With the increase in tempering temperature, the low temperature toughness of steel can be improved considerably. The yield ratio of the steel was reduced after tempering at 650 °C and higher temperatures due to reversed austenitic phase transformation.

Wear volume prediction of AISI H13 die steel using response surface methodology and artificial neural network

2020 ◽  
Vol 14 (2) ◽  
pp. 6789-6800
Author(s):  
Vishal Jagota ◽  
Rajesh Kumar Sharma
Keyword(s):  
Neural Network ◽  
Heat Treatment ◽  
Artificial Neural Network ◽  
Response Surface ◽  
Sliding Wear ◽  
Austenitizing Temperature ◽  
Tempering Temperature ◽  
Die Steel ◽  
Artificial Neural ◽  
Tempering Time

Resistance to wear of hot die steel is dependent on its mechanical properties governed by the microstructure. The required properties for given application of hot die steel can be obtained with control the microstructure by heat treatment parameters. In the present paper impact of different heat treatment parameters like austenitizing temperature, tempering time, tempering temperature is studied using response surface methodology (RSM) and artificial neural network (ANN) to predict sliding wear of H13 hot die steel. After heat treating samples at austenitizing temperature of 1020°C, 1040°C and 1060°C; tempering temperature 540°C, 560°C and 580°C; tempering time 1hour, 2hours and 3hours, experimentation on pin-on-disc tribo-tester is done to measure the sliding wear of H13 die steel. Box-Behnken design is used to develop a regression model and analysis of variance technique is used to verify the adequacy of developed model in case of RSM. Whereas, multi-layer feed-forward backpropagation architecture with input layer, single hidden layer and an output layer is used in ANN. It was found that ANN proves to be a better tool to predict sliding wear with more accuracy. Correlation coefficient R2 of the artificial neural network model is 0.986 compared to R2 of 0.957 for RSM. However, impact of input parameter interactions can only be analysed using response surface method. In addition, sensitivity analysis is done to determine the heat treatment parameter exerting most influence on the wear resistance of H13 hot die steel and it showed that tempering time has maximum influence on wear volume, followed by tempering temperature and austenitizing temperature. The prediction models will help to estimate the variation in die lifetime by finding the amount of wear that will occur during use of hot die steel, if the heat treatment parameters are varied to achieve different properties.

Effect of Ni content on the Hardenability of a Bainitic Steel for Processing of Plastics

2017 ◽  
Author(s):  
José Britti Bacalhau ◽  
Túlio Mumic Cunha ◽  
Conrado Ramos Moreira Afonso
Keyword(s):  
Bainitic Steel ◽  
Ni Content

CANNON-MUSKEGON H-12

Alloy Digest ◽  
1973 ◽  
Vol 22 (5) ◽  
Keyword(s):  
Physical Properties ◽  
Tool Steel ◽  
Silicon Content ◽  
Cast Steel ◽  
Heat Treating ◽  
Austenitizing Temperature ◽  
Red Hardness

Abstract CANNON-MUSKEGON H-12 is an air-hardening hot-work cast tool steel used for applications requiring good toughness combined with good red hardness. The alloy will harden from a relatively low austenitizing temperature. A higher silicon content is permissable in this cast steel than in AISI H-12 (wrought) tool steel. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on casting, heat treating, machining, and joining. Filing Code: TS-255. Producer or source: Cannon-Muskegon Corporation.

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