Correction to: Effect of Hot Deformation Parameters on the Dissolution of γ′ Precipitates for As-Cast Ni-Based Superalloys

Low alloyed steels produced by continuous casting are thermomechanically treated to achieve final high mechanical properties, meaning a good combination of strength and toughness. The hot deformation mechanisms of a micro-alloyed steel containing up to 0.1wt% of V is studied by means of hot compression tests using a Gleeble®3800 device. Austenitization of samples is carried out at 1150°C during 2 minutes followed by cooling to the deformation temperature at 1Ks-1in the range of 750 – 1150°C. The studied strain rate range is from 0.01 to 80 s-1and the total true strain achieved is of 0.7. In situ water quenching is applied after the deformation to freeze the microstructure and avoid any post dynamic effect. The Ar3temperature is determined by dilatometry experiments to be 725°C for the used cooling rate. The stress values obtained from the compression tests are evaluated at different strains to determine the strain rate sensitivity and flow instability maps and thus, to predict the formability of the material in the range of studied deformation parameters. These maps are correlated to the microstructure at specific deformation parameters.

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Effects of Mn and Zr Addition in 6000 Series Aluminum Alloys on the Formation of Stabilized Substructures during Hot Deformation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.877.281 ◽

2016 ◽

Vol 877 ◽

pp. 281-289 ◽

Cited By ~ 2

Author(s):

Hiroki Tanaka ◽

Yasunori Nagai

Keyword(s):

Heat Treatment ◽

Thermal Stability ◽

Aluminum Alloys ◽

Strain Rate ◽

Hot Deformation ◽

Fibrous Structure ◽

Deformation Parameters ◽

Zr Addition ◽

Plane Strain Compression Test ◽

Thermal Stability Of

Thermal stability of substructures in 6000 series aluminum alloys containing Mn and Zr elements was investigated using plane-strain compression test. In order to form thermally stabilized substructures, the deformation parameters should be selected so as to correlate with kinetic precipitation during the deformation. For substructures of the alloys containing Mn and Zr elements, the substructures were stable during the heat treatment at 540 ̊C when the alloys were deformed at a temperature above 350 ̊C. The sheets rolled above 350 ̊C at a strain rate of under 3 s-1 per pass showed the fibrous structure and well developed β-fiber textures after the heat treatment at 540 ̊C. The sheets with the fibrous structure had an average Lankford value larger than one.

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Effect of deformation parameters on twinning evolution during hot deformation in a typical nickel-based superalloy

Materials Science and Engineering A ◽

10.1016/j.msea.2017.04.077 ◽

2017 ◽

Vol 696 ◽

pp. 290-298 ◽

Cited By ~ 15

Author(s):

Hongbin Zhang ◽

Haiping Zhou ◽

Shengxue Qin ◽

Jie Liu ◽

Xingming Xu

Keyword(s):

Hot Deformation ◽

Nickel Based Superalloy ◽

Deformation Parameters

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The Effects of Hot Deformation Parameters on the Size of Dynamically Recrystallised Austenite Grains of HSLA Steel

10.20944/preprints201907.0096.v1 ◽

2019 ◽

Author(s):

Sebastian Gnapowski ◽

Elżbieta Kalinowska- Ozgowicz ◽

Mariusz Sniadkowski ◽

Aleksandra Pietraszek

Keyword(s):

Grain Size ◽

Hot Deformation ◽

Hsla Steel ◽

Optical Microscope ◽

Austenite Grain Size ◽

Deformation Parameters ◽

Austenite Grain ◽

Austenite Grains ◽

Ebsd Technique ◽

Scanning Electron

This paper presents the results of investigations of the effects of hot deformation parameters in compression investigation on the austenite grain size in HSLA steel (0.16% C, 0.037% Nb, 0.004% Ti, 0.0098% N). The axisymmetric compression investigations were performed on cylindrical investigation specimens of d=1.2 using the Gleeble 3800 simulator. The strain rate=1s-1÷15.9s-1 and strain degree ε=1.2. Before deformation, the research specimens were austenitized at TA = 1100 ÷ 1250 °C. Metallographic observations of the primary austenite grains were conducted with an optical microscope, while the structure of dynamically recrystallized austenite, inherited by martensite, was examined by EBSD technique using a scanning electron microscope. Based on the analysis of investigation results, it was found that the size of dynamically recrystallized austenite grains in HSLA steel were clearly affected by hot compression parameters. In contrast, no significant impact of austenitising temperature on their size was found.

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Effect of Hot Deformation Parameters on Flow Behavior and Microstructure of Ti-6Al-4V-0.2O Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.137 ◽

2017 ◽

Vol 898 ◽

pp. 137-143

Author(s):

Lin Xiang ◽

Bin Tang ◽

Hong Chao Kou ◽

Jie Shao ◽

Jin Shan Li

Keyword(s):

Strain Rate ◽

Hot Deformation ◽

Deformation Temperature ◽

Dynamic Recovery ◽

Volume Fraction ◽

Flow Behavior ◽

Strain Rates ◽

Compression Tests ◽

Height Reduction ◽

Deformation Parameters

Isothermal compression tests were conducted to investigate the effect of hot deformation parameters on flow behavior and microstructure of Ti-6Al-4V-0.2O alloy. The experimental results show that the strain rate and height reduction have little effect on the volume fraction of primary α at a deformation temperature of 860 ̊C. At a deformation temperature of 940 ̊C, the volume fraction of primary α at a high strain rate (10s-1) is about 10% less than that at low strain rates (0.01s-1~1s-1). It may be one of the reasons for the significantly discontinuous yielding phenomenon. Another reason is that the dislocation density decreased suddenly due to the dynamic recovery. With the increasing strain rate and the decreasing deformation temperature, the volume fraction of irregular secondary α increases and lamellar secondary α decreases. And with height reduction increasing, the irregular secondary α increases firstly and then tends to be steady because of dynamic recovery and recrystallization.

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Modelling the Hot Deformation Stress-Strain Curve of a Ni-Based Superalloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.762.753 ◽

2013 ◽

Vol 762 ◽

pp. 753-756 ◽

Cited By ~ 3

Author(s):

G.E. Kodzhaspirov ◽

A. Borowikow ◽

M. Terentyev

Keyword(s):

Hot Deformation ◽

Deformation Behavior ◽

Strain Curve ◽

Peak Stress ◽

Temperature Deformation ◽

Stress Strain Curve ◽

Hot Deformation Behavior ◽

Nickel Based Superalloy ◽

Deformation Parameters ◽

Deformation Stress

A study on the hot deformation behavior and microstructural changes of nickel based superalloy are presented. Constitutive equation allowing the calculation of peak stress was derived. A study of the effect of the temperature-deformation parameters on the kinetic of austenitic heat-resistant superalloy dynamic recrystallization and on the microstructure evolution was performed as well.

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