scholarly journals Influence of Si and Al contents and isothermal treatment condition on the microstructure and tensile properties in ultra-high strength Fe-0.2C-2.0Mn martensite-bainite complex phase steels

2021 ◽  
Vol 59 (9) ◽  
pp. 602-612
Author(s):  
Eung Hyuk Lee ◽  
Chang Jae Yu ◽  
Hong-Bum Lee ◽  
Ji-Hoon Kim ◽  
Dong-Woo Suh
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
High Strength ◽  
Partial Replacement ◽  
Isothermal Treatment ◽  
Isothermal Heat Treatment ◽  
Bainite Transformation ◽  
Complex Phase ◽  
Isothermal Temperature ◽  
Final Microstructure

This study investigated the influence of partial replacement of Si by Al on the microstructure and tensile properties of ultra-high strength steels with martensite-bainite complex microstructure produced by austenitization and subsequent isothermal heat treatment around Ms temperature. When the isothermal heat treatment was done below the Ms temperature, the fraction of martensite increased with the lower isothermal temperature, but the fractions of constituent phases in the final microstructure were not significantly affected by the partial replacement of Si by Al. Nevertheless, the increase in Al content in the complex phase steel accelerated the bainite transformation, which is thought to be associated with the increase of the free energy difference between FCC and BCC. The enhancement of the bainite transformation not only effectively suppressed the martensite formation upon final cooling when the isothermal temperature was above the Ms temperature but also helped refine the final microstructure when subjected to isothermal heat treatment below the Ms temperature. The yield strengths of the investigated complex phase steels were little influenced by the partial replacement of Si with Al, as long as the fractions of the constituent phases were comparable. This possibly originates with the solid solution hardening and the microstructure refinement with Al addition.

Effect of Isothermal Heat Treatment on Dynamic Properties of a High Strength Steel

2015 ◽  
Vol 782 ◽  
pp. 124-129
Author(s):  
Wen Wen Du ◽  
Qian Wang ◽  
Lin Wang ◽  
Ding Wang
Keyword(s):  
Heat Treatment ◽  
Yield Strength ◽  
Strain Rate ◽  
High Strength Steel ◽  
Split Hopkinson Pressure Bar ◽  
Testing Machine ◽  
High Strength ◽  
Isothermal Heat Treatment ◽  
Quenching Temperature ◽  
Isothermal Temperature

The high strength steel which was subjected with isothermal heat treatment at three different temperatures, namely 330°C, 350°Cand 380°C after different quenching temperature namely 880°C and 900°C,was investigated in this paper. The quasi-static and dynamic mechanical properties of new high strength steel was tested by universal material testing machine and Split Hopkinson Pressure Bar (SHPB). Experimental results have showed that the yield strength and tensile strength of the steel reach 1100MPa and 1400MPa respectively. Hardness, yield strength and toughness are found to decrease with the consequently increasing of isothermal temperature under the same quenching temperature. The compression properties of the steel under quenching temperature of 880°C are higher than that of 900°C with the same isothermal temperature. It can be found that the steel which is subjected with isothermal heat treatment show strain rate sensitivity under high velocity impact. When isothermal temperature is set 380°C, the steel exhibits the most obvious strain rate hardening effect.

DOCOL 1400 MZE

Alloy Digest ◽  
2014 ◽  
Vol 63 (1) ◽  
Keyword(s):  
Heat Treatment ◽  
Chemical Composition ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Martensitic Steel ◽  
High Strength ◽  
Water Quenching ◽  
Continuous Annealing ◽  
Bend Strength

Abstract DOCOL 1400 MZE is a cold reduced fully martensitic steel. Docol M steels are manufactured using special heat treatment in a continuous annealing line. The ultra high strength is produced by extremely fast water quenching from an elevated austenitic temperature range. Docol M grades are characterized by good formability at these high strength levels combined with good weldability. All conventional welding methods can be used due to the lean chemical composition. The ZE suffix in the title signifies that is electrogalvanized. This datasheet provides information on composition, physical properties, tensile properties, and bend strength. It also includes information on forming and surface treatment. Filing Code: SA-689. Producer or source: SSAB Swedish Steel Inc..

DOCOL 1200 MZE

Alloy Digest ◽  
2013 ◽  
Vol 62 (11) ◽  
Keyword(s):  
Heat Treatment ◽  
Chemical Composition ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Water Quenching ◽  
Continuous Annealing ◽  
Martensitic Steels ◽  
Temperature Range

Abstract Docol M are cold reduced fully martensitic steels. These steels are manufactured using special heat treatment in a continuous annealing line. The ultra high strength is produced by extremely fast water quenching from an elevated austenitic temperature range. Docol M grades are characterized by good formability at these high-strength levels combined with good weldability. All conventional welding methods can be used due to the lean chemical composition. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on forming. Filing Code: SA-687. Producer or source: SSAB Swedish Steel Inc..

Effect of Annealing Process on Microstructure and Tensile Properties of TC16 Titanium Alloy after Rapid Heat Treatment

2021 ◽  
Vol 1032 ◽  
pp. 152-156
Author(s):  
Peng Lei ◽  
Shu Cheng Dong ◽  
Guang Yu Ma ◽  
Tuo Cheng ◽  
O.M. Ivasishin
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Tensile Properties ◽  
High Strength ◽  
Optical Microscope ◽  
Annealing Process ◽  
Test Machine ◽  
Two Phase ◽  
Reduction Of Area ◽  
Rapid Heat Treatment

TC16 titanium alloy is a martensite α+β two-phase high strength titanium alloy, which can improve its structure and enhance properties through heat treatment. Effect of annealing process on microstructure and tensile properties of TC16 titanium alloy was investigated using optical microscope, scanning electron microscope and universe tensile test machine. The results show that when annealed at 720°C for 4h then furnace cooling to ambient temperature, the tensile strength of the TC16 alloy reaches nearly 900MPa,the elongation reaches 19.6% and the reduction of area reaches 65%, which present a good comprehensive performance.

Mechanical Properties of a Mild-Alloy Steel for Aerospace Engineering

2021 ◽  
Vol 410 ◽  
pp. 221-226
Author(s):  
Mikhail V. Maisuradze ◽  
Maxim A. Ryzhkov ◽  
Dmitriy I. Lebedev
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Strength ◽  
Aerospace Engineering ◽  
Isothermal Heat Treatment ◽  
Tempering Temperature ◽  
Optimal Heat Treatment ◽  
Treatment Conditions ◽  
Quenching And Tempering ◽  
Conventional Oil

The features of microstructure and mechanical properties of the aerospace high strength steel were studied after the implementation of various heat treatment modes: conventional oil quenching and tempering, quenching-partitioning, austempering. The dependence of the mechanical properties on the tempering temperature was determined. The basic patterns of the formation of mechanical properties during the implementation of isothermal heat treatment were considered. The optimal heat treatment conditions for the studied steel were established.

scholarly journals High Versatility of Niobium Alloyed AHSS

2017 ◽  
Vol 62 (3) ◽  
pp. 1485-1491 ◽  
Author(s):  
L. Kučerová ◽  
K. Opatová ◽  
J. Káňa ◽  
H. Jirková
Keyword(s):  
Heat Treatment ◽  
Retained Austenite ◽  
Volume Fraction ◽  
High Strength ◽  
Processing Parameters ◽  
High Ductility ◽  
Processing Strategies ◽  
Cooling Schedules ◽  
Final Microstructure ◽  
Steel Processing

AbstractThe effect of processing parameters on the final microstructure and properties of advanced high strength CMnSiNb steel was investigated. Several processing strategies with various numbers of deformation steps and various cooling schedules were carried out, namely heat treatment without deformation, conventional quenching and TRIP steel processing with bainitic hold or continuous cooling. Obtained multiphase microstructures consisted of the mixture of ferrite, bainite, retained austenite and M-A constituent. They possessed ultimate tensile strength in the range of 780-970 MPa with high ductility A5mmabove 30%. Volume fraction of retained austenite was for all the samples around 13%. The only exception was reference quenched sample with the highest strength 1186 MPa, lowest ductility A5mm= 20% and only 4% of retained austenite.

STRESSPROOF

Alloy Digest ◽  
1985 ◽  
Vol 34 (11) ◽  
Keyword(s):  
Heat Treatment ◽  
Shear Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
High Strength ◽  
Heat Treating ◽  
Steel Company ◽  
Medium Carbon

Abstract STRESSPROOF is a medium carbon-manganese resulfurized free-machining steel. It is a heavy-drafted, cold drawn, straightened and stress relieved bar steel with high strength, improved fatigue resistance, and excellent machinability. It does not require heat treatment after fabrication. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on heat treating, machining, and joining. Filing Code: CS-2. Producer or source: LaSalle Steel Company. Originally published March 1954, revised November 1985.

NICOMET 1

Alloy Digest ◽  
2000 ◽  
Vol 49 (8) ◽  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Spinodal Decomposition ◽  
High Strength ◽  
Heat Treating ◽  
Strength Properties ◽  
Typical Application ◽  
Copper Nickel

Abstract Nicomet 1 is a copper-nickel-tin alloy that has high strength because of spinodal decomposition in heat treatment. The alloy could replace aluminum and manganese bronzes. A typical application utilizes both the good antifriction and high strength properties. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on wear resistance as well as heat treating. Filing Code: CU-652. Producer or source: Anchor Bronze & Metals, Inc.

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