scholarly journals Effect of tempering temperature and time on microstructure and mechanical properties of 26MnB5 martensitic steel tubes

2019 ◽  
Vol 14 ◽  
pp. 142-149 ◽  
Author(s):  
S Usha Rani ◽  
M Preethi
Keyword(s):  
Mechanical Properties ◽  
Martensitic Steel ◽  
Steel Tubes ◽  
Tempering Temperature ◽  
Microstructure And Mechanical Properties

scholarly journals Effects of Orthogonal Heat Treatment on Microstructure and Mechanical Properties of GN9 Ferritic/Martensitic steel

2021 ◽  
Author(s):  
Tingwei Ma ◽  
Xianchao Hao ◽  
Ping Wang
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Yield Strength ◽  
Martensitic Steel ◽  
Orthogonal Design ◽  
Austenitizing Temperature ◽  
Tempering Temperature ◽  
Microstructure And Mechanical Properties ◽  
Cooling Methods

Abstract Microstructure and mechanical properties of GN9 Ferritic/Martensitic steel for sodium-cooled fast reactors have been investigated through orthogonal design and analysis. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimeter (DSC), tensile and impact tests were used to evaluate the heat treatment parameters on yield strength, elongation and ductile-to-brittle transition temperature (DBTT). The results indicate that the microstructures of GN9 steel after orthogonal heat treatments consist of tempered martensite, M23C6, MX carbides and MX carbonitrides. The average prior austenite grains increase and the lath width decreases with the austenitizing temperature increasing from 1000 oC to 1080 oC. Tempering temperature is the most important factor that influences the dislocation evolution, yield strength and elongation compared with austenitizing temperature and cooling methods. Austenitizing temperature, tempering temperature and cooling methods show interactive effects on DBTT. Carbide morphology and distribution, which is influenced by austenitizing and tempering temperatures, is the critical microstructural factor that influences the Charpy impact energy and DBTT. Based on the orthogonal design and microstructural analysis, the optimal heat treatment of GN9 steel is austenitizing at 1000 oC for 0.5 h followed by air cooling and tempering at 760 oC for 1.5 h.

scholarly journals The Effect of Quenching and Partitioning (Q&P) Heat Treatment on the Microstructure and Mechanical Properties of High Boron Steel

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1556
Author(s):  
Zhao Li ◽  
Run Wu ◽  
Mingwei Li ◽  
Song-Sheng Zeng ◽  
Yu Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Volume Fraction ◽  
Martensitic Steel ◽  
Boron Steel ◽  
Quenching And Partitioning ◽  
Effect Mechanism ◽  
Microstructure And Mechanical Properties ◽  
High Boron ◽  
Cast Condition

High boron steel is prone to brittle failure due to the boride distributed in it with net-like or fishbone morphology, which limit its applications. The Quenching and Partitioning (Q&P) heat treatment is a promising process to produce martensitic steel with excellent mechanical properties, especially high toughness by increasing the volume fraction of retained austensite (RA) in the martensitic matrix. In this work, the Q&P heat treatment is used to improve the inherent defect of insufficient toughness of high boron steel, and the effect mechanism of this process on microstructure transformation and the change of mechanical properties of the steel has also been investigated. The high boron steel as-casted is composed of martensite, retained austensite (RA) and eutectic borides. A proper quenching and partitioning heat treatment leads to a significant change of the microstructure and mechanical properties of the steel. The net-like and fishbone-like boride is partially broken and spheroidized. The volume fraction of RA increases from 10% in the as-cast condition to 19%, and its morphology also changes from blocky to film-like. Although the macro-hardness has slightly reduced, the toughness is significantly increased up to 7.5 J·cm−2, and the wear resistance is also improved.

scholarly journals Effect of cooling rate on microstructure and mechanical properties of CB2 tempered martensitic steel

China Foundry ◽  
2020 ◽  
Vol 17 (2) ◽  
pp. 158-166
Author(s):  
Yu-lin Ma ◽  
Yue Liu ◽  
Li-ping Zhang ◽  
Xu Jiang ◽  
Chun-ming Liu
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Martensitic Steel ◽  
Microstructure And Mechanical Properties
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