Isothermal quenching of cold-heading dies

1970 ◽  
Vol 12 (2) ◽  
pp. 164-165
Author(s):  
G. K. Savinovskii
Keyword(s):  
Isothermal Quenching

Effect of isothermal quenching on microstructure and properties of a forged and unforged Fe-B cast alloy

2017 ◽  
Vol 59 (10) ◽  
pp. 876-880 ◽  
Author(s):  
Jianjun Zhang ◽  
Huimin Liao ◽  
Sude Ma
Keyword(s):  
Cast Alloy ◽  
Isothermal Quenching ◽  
Microstructure And Properties

Strengthening railroad rails by isothermal quenching to lower bainite

Metallurgist ◽  
2013 ◽  
Vol 56 (9-10) ◽  
pp. 779-786 ◽  
Author(s):  
Yu. A. Samoilovich
Keyword(s):  
Lower Bainite ◽  
Isothermal Quenching ◽  
Railroad Rails

scholarly journals Austenitization of FerriticDuctile Iron

2014 ◽  
Vol 14 (4) ◽  
pp. 49-54 ◽  
Author(s):  
A. Krzyńska ◽  
A. Kochański
Keyword(s):  
Heat Treatment ◽  
Ductile Iron ◽  
Starting Material ◽  
Austempered Ductile Iron ◽  
Isothermal Quenching ◽  
Micro Hardness ◽  
Hardness Testing ◽  
Ferritic Matrix ◽  
Rate Of Dissolution ◽  
Nodular Graphite

Abstract Austenitization is the first step of heat treatment preceding the isothermal quenching of ductile iron in austempered ductile iron (ADI) manufacturing. Usually, the starting material for the ADI production is ductile iron with more convenient pearlitic matrix. In this paper we present the results of research concerning the austenitizing of ductile iron with ferritic matrix, where all carbon dissolved in austenite must come from graphite nodules. The scope of research includedcarrying out the process of austenitization at 900° Cusing a variable times ranging from 5 to 240minutes,and then observations of the microstructure of the samples after different austenitizing times. These were supplemented with micro-hardness testing. The research showed that the process of saturating austenite with carbon is limited by the rate of dissolution of carbon from nodular graphite precipitates

Microstructures and Properties of a Bainite and Martensite Dual-Phase Cast Steel Fabricated by Combination of Alloying and Controlled Cooling Heat Treatment

2005 ◽  
Vol 475-479 ◽  
pp. 93-96 ◽  
Author(s):  
Ye Hua Jiang ◽  
Rong Feng Zhou ◽  
Dehong Lu ◽  
Zhen Hua Li
Keyword(s):  
Heat Treatment ◽  
Cast Steel ◽  
Residual Austenite ◽  
Lower Bainite ◽  
Manganese Steel ◽  
Isothermal Quenching ◽  
Dual Phase ◽  
Controlled Cooling ◽  
Carbide Particles ◽  
Better Than

A bainite/martensite dual-phase cast steel was fabricated by a process of combination of alloying with Si and Mn elements and controlled cooling heat-treatment. Its microstructure was consisted of fine lower bainite with carbide particles precipitated homogeneously, martensite and a little residual austenite. Because of the good match of hardness and impact toughness, its impact wear performance was a little better than that of the isothermal quenching steel, and much better than that of high manganese steel such as Mn13.

Effect of Isothermal Quenching on Microstructure and Tensile Properties of 12CrNi2 Alloy Steel Prepared by Laser Additive Manufacturing

2020 ◽  
Vol 57 (9) ◽  
pp. 091403
Author(s):  
亢红伟 Kang Hongwei ◽  
董志宏 Dong Zhihong ◽  
张炜 Zhang Wei ◽  
谢玉江 Xie Yujiang ◽  
迟长泰 Chi Changtai ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Isothermal Quenching ◽  
Laser Additive Manufacturing

scholarly journals Carbide Precipitation in Ferrite in Nb–V-Bearing Low-Carbon Steel During Isothermal Quenching Process

2017 ◽  
Vol 30 (11) ◽  
pp. 1067-1079 ◽  
Author(s):  
Xiao-Lin Li ◽  
Cheng-Shuai Lei ◽  
Xiang-Tao Deng ◽  
Yan-Mei Li ◽  
Yong Tian ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Carbide Precipitation ◽  
Isothermal Quenching ◽  
Low Carbon ◽  
Quenching Process

Effect of Austenitizing Processes on Isothermal Quenching Microstructure in Bearing Steel

2014 ◽  
Vol 887-888 ◽  
pp. 276-280
Author(s):  
Lei Tian ◽  
Sheng Li Li ◽  
Ji Zhi Liu ◽  
Xiang Hai Zhang
Keyword(s):  
Residual Austenite ◽  
Fracture Morphology ◽  
Bearing Steel ◽  
Isothermal Quenching ◽  
Content Increase ◽  
Dispersion Strengthening ◽  
Austenitizing Temperature ◽  
Microstructure Observation ◽  
Fine Grain ◽  
Lower Temperature

Austempering was applied to bearing steel to improve the performance. The effect of austenitizing temperature and time on isothermal quenching microstructure in bearing steel was investigated via microstructure observation and fracture analysis. The results show that with the increase of austenitizing temperature, the size of bainite plate and residual austenite content increase. Austenitizing at lower temperature, the samples has a fracture composite fracture morphology of polygon cleavage unit and even small dimple.The fracture morphology of sample austenitized at 1050 °C is quasi-cleavage fracture with bar cleavage unit which is corresponding to the coarse acicular microstructure. the size of bainite plate increase with increasing the austenitizing time. As the result of comprehensive effect of fine grain strengthening and dispersion strengthening, that the microhardness firstly increases, and then obviously decreases with the increase of austenitizing time.

scholarly journals Thermal Stability of Nanocrystalline Structure In X37CrMoV5-l Steel

2015 ◽  
Vol 60 (1) ◽  
pp. 511-516 ◽  
Author(s):  
E. Skołek ◽  
S. Marciniak ◽  
W.A. Świątnicki
Keyword(s):  
Thermal Stability ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Bainitic Ferrite ◽  
Nanocrystalline Structure ◽  
Thin Layers ◽  
Isothermal Quenching ◽  
Initial Stage ◽  
Increasing Temperature ◽  
Thermal Stability Of

AbstractThe aim of the study was to investigate the thermal stability of the nanostructure produced in X37CrMoV5-1 tool steel by austempering heat treatment consisted of austenitization and isothermal quenching at the range of the bainitic transformation. The nanostructure was composed of bainitic ferrite plates of nanometric thickness separated by thin layers of retained austenite. It was revealed, that the annealing at the temperature higher than temperature of austempering led to formation of cementite precipitations. At the initial stage of annealing cementite precipitations occurred in the interfaces between ferritic bainite and austenite. With increasing temperature of annealing, the volume fraction and size of cementite precipitations also increased. Simultaneously fine spherical Fe7C3carbides appeared. At the highest annealing temperature the large, spherical Fe7C3carbides as well as cementite precipitates inside the ferrite grains were observed. Moreover the volume fraction of bainitic ferrite and of freshly formed martensite increased in steel as a result of retained austenite transformation during cooling down to room temperature.

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