Effect of Isothermal Quenching on Microstructure and Hardness of GCr15 Steel

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

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.93 ◽

2005 ◽

Vol 475-479 ◽

pp. 93-96 ◽

Cited By ~ 3

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.

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

Laser & Optoelectronics Progress ◽

10.3788/lop57.091403 ◽

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

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Quick Spherodizing in GCr15 Steel by Mechanism of Divorced Eutectoid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.295-297.515 ◽

2011 ◽

Vol 295-297 ◽

pp. 515-519 ◽

Cited By ~ 2

Author(s):

Qi Wei Chen ◽

Guo Hui Zhu ◽

Shu Min Cao ◽

Ai Min Zhao

Keyword(s):

Phase Transformation ◽

Energy Consumption ◽

Annealing Time ◽

Eutectoid Transformation ◽

Transformation Mechanism ◽

Gcr15 Steel ◽

Spheroidizing Annealing ◽

Novel Processing ◽

Conventional Annealing

A novel processing of quick spheroidizing annealing based on DET(divorced eutectoid transformation) mechanism has been presented in this paper. Spheroidized carbide microstructure could be achieved directly by austenite through phase transformation during cooling processing, which is different from the conventional spheroidization annealing where carbide was spheroidized by carbide lamellar gradually resolved and coarsened.The novel processing of spheroidizing annealing presented here will decrease the annealing time from 10-16 hours in conventional processing to around 2-3 hours, which could save about 50% of the energy consumption, comparing to the conventional annealing processing.

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