Partitioning of the High Strength Steel Contained Ti Microalloy Element at the Temperatures Above and Below Martensitic Transformation Start Temperature (Ms)

2021 ◽  
Author(s):  
Ali Almasi ◽  
Abbas Kianvash ◽  
Abolfazl Tutunchi
Keyword(s):  
Martensitic Transformation ◽  
High Strength Steel ◽  
High Strength ◽  
Start Temperature

The effect of martensitic transformation on residual stress in resistance spot welded high-strength steel sheets

2013 ◽  
Vol 577 ◽  
pp. S684-S689 ◽  
Author(s):  
Muneyoshi Iyota ◽  
Yoshiki Mikami ◽  
Tadafumi Hashimoto ◽  
Koichi Taniguchi ◽  
Rinsei Ikeda ◽  
...  
Keyword(s):  
Residual Stress ◽  
Martensitic Transformation ◽  
High Strength Steel ◽  
High Strength ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Spot Welded

Effect of Austenization Holding Time on the Martensitic Transformation in 30CrNi3MoV Ultra-High-Strength Steel

2011 ◽  
Vol 228-229 ◽  
pp. 1107-1111
Author(s):  
Zhi Xia Qiao ◽  
Dan Tian Zhang ◽  
Yong Chang Liu ◽  
Ze Sheng Yan
Keyword(s):  
Martensitic Transformation ◽  
High Strength Steel ◽  
High Strength ◽  
Holding Time ◽  
Critical Parameters ◽  
Treatment Technology ◽  
Heat Treated ◽  
Ultra High Strength Steel ◽  
Austenite Grains ◽  
Dislocation Defects

Any heat treatment technology must begin with the process of austenization, during which the holding time at austenite region is one of the critical parameters. The effect of austenization treatment holding time on the martensitic transformation in the 30CrNi3MoV ultra-high-strength steel was investigated by means of dilatometric measurements and microstructural observations. The results showed that extending the holding time at 900 oC won’t cause obvious coarsening of austenite grains due to the dragging effect of vanadium solute atoms adsorbed at austenite grain boundaries. Martensite microstructures obtained in the 30CrNi3MoV samples that were heat treated with different holding time varied a little. The austenization holding time has obvious influence on the Ms of the 30CrNi3MoV steel, because it simultaneously affect the size of prior austenite grains and the configuration of dislocation defects.

Effect of Austenization Temperature on the Martensitic Transformation in a Low-Alloy Ultra-High-Strength Steel

2011 ◽  
Vol 66-68 ◽  
pp. 1797-1801
Author(s):  
Zhi Xia Qiao ◽  
Dan Tian Zhang ◽  
Yong Chang Liu ◽  
Ze Sheng Yan
Keyword(s):  
Martensitic Transformation ◽  
High Strength Steel ◽  
Heating Temperature ◽  
Lath Martensite ◽  
High Strength ◽  
Treatment Temperature ◽  
Austenite Grain ◽  
Ultra High Strength Steel ◽  
Austenite Grains ◽  
Vanadium Carbides

The effect of austenization treatment temperature on the martensitic transformation in the 30CrNi3MoV ultra-high-strength steel was investigated by means of dilatometric measurements and microstructural observations. The results showed that the coarsening temperature of austenite grains in the 30CrNi3MoV steel is raised to about 1000°C due to the inhibition to the migration of austenite grain boundaries, not only by the fine and disperse vanadium carbides, but also by the solute atoms adsorbed near the boundaries. The martensite obtained in 30CrNi3MoV samples with different austenization temperatures varied in the structural constituent, as well as in the size. The martensite microstructures obtained in the samples austenized at relatively low temperatures were composed of both lath martensite and acicular martensite and they are small in size. Yet the microstructures in the 30CrNi3MoV samples with relatively high austenization temperatures were occupied mostly by coarse lath martensite. For the 30CrNi3MoV steel, the austenization heating temperature should be kept below 1000°C in order to achieve the optimum mechanical property.

Influence of Austenite Grain Size on Martensite Start Temperature of Nb-V-Ti Microalloyed Ultra-High Strength Steel

2016 ◽  
Vol 848 ◽  
pp. 624-632 ◽  
Author(s):  
Ji Dong ◽  
Chen Xi Liu ◽  
Yong Chang Liu ◽  
Chong Li ◽  
Qian Ying Guo ◽  
...  
Keyword(s):  
Grain Size ◽  
Dislocation Density ◽  
High Strength Steel ◽  
Volume Fraction ◽  
High Strength ◽  
Austenite Grain Size ◽  
Microstructure Observation ◽  
Austenite Grain ◽  
Ultra High Strength Steel ◽  
Start Temperature

In order to investigate the effect of austenite grain size on martensite start temperature of Nb-V-Ti micro-alloyed ultra-high strength steel, the phase transformation features of Nb-V-Ti micro-alloyed steel was investigated. It has been found that martensite start temperature increased with the increase of austenite grain size as a consequence of the increase of austenitizing temperature. Based on microstructure observation, two types of MX carbonitrides with different compositions and morphologies have been identified. With the increase of the austenite grain size, both the volume fraction of precipitates and the dislocation density decreased, which may be induced by the strengthening of the austenite matrix directly and increasing the resistance of austenite to plastic deformation. Hence, the increase of martensite start temperature could be attributed to a decrease in volume fraction of precipitates and dislocation density.

Martensitic Transformation in a Low-Alloy Ultra-High-Strength Steel

2011 ◽  
Vol 295-297 ◽  
pp. 1470-1473 ◽  
Author(s):  
Zhi Xia Qiao ◽  
Dan Tian Zhang ◽  
Yong Chang Liu ◽  
Ze Sheng Yan
Keyword(s):  
Martensitic Transformation ◽  
High Strength Steel ◽  
Lath Martensite ◽  
High Strength ◽  
Transformation Rate ◽  
Low Carbon ◽  
High Carbon ◽  
Process Characteristics ◽  
Ultra High Strength Steel ◽  
Carbon Martensite

Martensitic transformation is the most important phase transformation strengthening the 30CrNi3MoV ultra-high-strength steel during heat treatment process. Characteristics of the martensitic transformation in the 30CrNi3MoV steel were investigated by means of dilatometric measurements and microstructural observations. The results showed that the starting and finishing martensitic transformation temperatures of the 30CrNi3MoV explored steel are 317°C and 167°C respectively, which are hardly influenced by the cooling rate from austenite region. Such a wide temperature range of martensitic transformation in the 30CrNi3MoV steel results into the diversity of martensite microstructures. The microstructures in all the quenched 30CrNi3MoV samples are composed of mixture of lath and acicular martensite, corresponding to low-carbon and high-carbon martensite respectively. The transformation rate of acicular martensite is much slower than that of lath martensite, which can be attributed to the stabilization of the rest high-carbon austenite after the formation of lath martensite.

Effect of Martensitic Transformation on the Plate Shape of the High Strength Steel during Roller Quenching Process

2013 ◽  
Vol 753-755 ◽  
pp. 257-260
Author(s):  
Da Li ◽  
Chun Mei Yang ◽  
Jian Ping Hu
Keyword(s):  
Martensitic Transformation ◽  
Temperature Stress ◽  
High Strength Steel ◽  
Equivalent Stress ◽  
High Strength ◽  
Maximum Deformation ◽  
Quenching Process ◽  
Plate Shape ◽  
Length Direction ◽  
Stress And Deformation

The variation of the temperature, stress and deformation of the high strength steel was simulated by using MSC.MARC software. The effect of martensitic transformation on the temperature, stress and deformation filed was discussed. The results shown that, the equivalent stress of the plate along length direction is distributed uneven when considered the phase transition. The maximum deformation and the deformation along length direction of the plate are increased obviously when considered the martensitic transformation.

In situ observation of the martensitic transformation in (Mg,Y)-PSZ

1986 ◽  
Vol 44 ◽  
pp. 500-501
Author(s):  
R-R. Lee
Keyword(s):  
Martensitic Transformation ◽  
High Strength ◽  
Nucleation And Growth ◽  
In Situ Observation ◽  
Considerable Potential ◽  
Transmission Electron ◽  
Structural Applications ◽  
Applied Stresses ◽  
Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

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