Lamellar Pearlite as an Initial Microstructure for Austenite Reversion Treatment

2021 ◽  
Vol 30 (2) ◽  
pp. 1330-1339
Author(s):  
Dezhen Yang ◽  
Chao Zhang ◽  
Xingwang Cheng ◽  
Zhiping Xiong
Keyword(s):  
Initial Microstructure ◽  
Lamellar Pearlite ◽  
Reversion Treatment

Synergistic Investigations of Post Deformation Annealing and Initial Microstructure on the Mechanical Properties of HSLA‐100 Steel

2021 ◽  
Author(s):  
Ali Heydarinia ◽  
Ali Koushki ◽  
Novin Rasooli ◽  
Mohammad Reza Hosseinzadeh ◽  
Mohammad Javad Sohrabi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Initial Microstructure

Mechanical Properties of Hypereutectoid Steel with Microduplex (α+θ) Structure Formed by Hot Deformation of Undercooled Austenite

2010 ◽  
Vol 654-656 ◽  
pp. 246-249
Author(s):  
Long Fei Li ◽  
Wei Chen ◽  
Wang Yue Yang ◽  
Zu Qing Sun
Keyword(s):  
Mechanical Properties ◽  
Hot Deformation ◽  
Ferrite Matrix ◽  
Subsequent Annealing ◽  
Test Machine ◽  
Compression Tests ◽  
Simulation Test ◽  
Hypereutectoid Steel ◽  
Lamellar Pearlite ◽  
Undercooled Austenite

Microstructure evolution and mechanical properties of hypereutectoid steel with the microduplex (α+θ) structures formed by hot deformation of undercooled austenite were investigated by hot uniaxial compression tests in a Gleeble-1500 simulation test machine, and the effects of subsequent annealing and the addition of Al were analyzed. The results indicated that at the beginning of hot deformation of undercooled austenite the formation of proeutectoid cementite was retrained and only lamellar pearlite was produced. With further strain, dynamic spheroidization of pearlite took place, leading to the formation of microduplex (α+θ) structure consisting of ultrafine ferrite matrix and dispersed cementite particles. In comparison with the normal microstructure consisting of lamellar pearlite and proeutectoid cementite, the microduplex (α+θ) structure presented higher strengths with similar ductility. Subsequent annealing could make the microduplex (α+θ) structure more uniform, which demonstrated better balance between strength and ductility. The addition of Al is disadvantageous to the formation of microduplex (α+θ) structure, but can result in the further refinement. With the addition of Al, the strength of microduplex (α+θ) structure was improved and the ductility was not deteriorated markedly.

Continuous Cooling Transformation Behavior of High Carbon Pearlitic Steel

2022 ◽  
Vol 905 ◽  
pp. 83-87
Author(s):  
Lu Lu Feng ◽  
Wei Wen Qiao ◽  
Jian Sun ◽  
De Fa Li ◽  
Ping Ping Li ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Vickers Hardness ◽  
Hardness Test ◽  
Pearlitic Steel ◽  
Transformation Behavior ◽  
High Carbon ◽  
Continuous Cooling Transformation ◽  
Continuous Cooling ◽  
Test Steel ◽  
Lamellar Pearlite

The continuous cooling transformation behavior of high-carbon pearlitic steel was studied by employing optical microscopy, scanning electron microscopy, and the Vickers hardness test. The results show that the microstructure of the test steel is composed of proeutectoid cementite and lamellar pearlite in the cooling rate range of 0.05–2 °C/s and lamellar pearlite in the range of 2–5 °C/s. Further, martensite appears at 10 °C/s. With the increase in the cooling rate, the Vickers hardness of the test steel first decreases and then increases. In the industrial production of high-carbon pearlite steel, the formation of proeutectoid cementite at a low cooling rate needs to be avoided, and at the same time, the formation of martensite and other brittle-phase at a high cooling rate needs to be avoided.

scholarly journals Effect of Initial Microstructure on Superplasticity in Ultrafine Grained 18Cr-9Ni Stainless Steel

2004 ◽  
Vol 45 (7) ◽  
pp. 2259-2263 ◽  
Author(s):  
Toshihiro Tsuchiyama ◽  
Yoshikazu Nakamura ◽  
Hideyuki Hidaka ◽  
Setsuo Takaki
Keyword(s):  
Stainless Steel ◽  
Initial Microstructure ◽  
Ultrafine Grained

Substructure and Crystallography of Degenerate Pearlite in an Fe-C Binary Alloy

2007 ◽  
Vol 539-543 ◽  
pp. 4832-4837 ◽  
Author(s):  
Tadashi Furuhara ◽  
Tomokazu Moritani ◽  
K. Sakamoto ◽  
Tadashi Maki
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Growth Front ◽  
Isothermal Transformation ◽  
High Angle ◽  
Austenite Grain ◽  
Transmission Electron ◽  
Proeutectoid Ferrite ◽  
Lamellar Pearlite ◽  
Scanning Electron

Microstructures formed by degenerate pearlite transformation in an Fe-0.38mass%C alloy were studied by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Degenerate pearlite which contains fine cementite particles even at the growth front was observed with other structures such as proeutectoid ferrite, lamellar pearlite and bainite in a temperature range between 773K and 923K. As the isothermal transformation temperature is lowered, a fraction of the degenerate pearlite increases. The degenerate pearlite consists of ‘block’ (a region in which ferrite orientations are nearly the same) and ‘colony’ (a region containing cementite particles of nearly the same orientation), both of which are similar to those in lamellar pearlite. Block boundaries within an austenite grain are generally of high-angle type and their misorientations deviate largely from intervariant relationships for the K-S orientation relationship. In contrast, colony boundaries are of low-angle type. Cementite films are formed along those ferrite boundaries in the degenerate pearlite, presumably formed by encounter of the blocks or colonies.

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