Effect of Ni on the Stability of Retained Austenite and Mechanical Properties for TRIP Steels Containing Vanadium

2013 ◽  
Vol 85 (2) ◽  
pp. 143-154 ◽  
Author(s):  
Naqiong Zhu ◽  
Qihao Wu ◽  
Yanlin He ◽  
Xiaogang Lu ◽  
Lin Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Trip Steels ◽  
The Stability

Effect of Phosphorus on Microstructure, Mechanical Properties, and Formation of Retained Austenite in TRIP Steels

2012 ◽  
Vol 508 ◽  
pp. 128-132 ◽  
Author(s):  
Eui Pyo Kwon ◽  
Shun Fujieda ◽  
Kozo Shinoda ◽  
Shigeru Suzuki
Keyword(s):  
Mechanical Properties ◽  
Carbon Concentration ◽  
Trip Steel ◽  
Retained Austenite ◽  
Volume Fraction ◽  
Transformation Induced Plasticity ◽  
Trip Steels ◽  
The Stability

In this Study, Influences of P on the Microstructure, Mechanical Properties, and Retained Austenite Characteristics in Transformation Induced Plasticity (TRIP) Steels Were Investigated. Microstructure of 0.2mass%P Containing TRIP Steel Was Inhomogeneous and it Resulted in Deterioration of the Mechanical Properties. Retained Austenite Characteristics such as Volume Fraction and Carbon Concentration Were Also Affected by P. The Stability of Retained Austenite in P Containing TRIP Steel Was Different from that in P-Free TRIP Steel. Such Difference in the Stability of Retained Austenite Was Attributed to the Effect of the Carbon Concentration in Retained Austenite as Well as their Different Microstructure.

Effect of Retained Austenite Stability on Mechanical Properties of 590MPa Grade TRIP Sheet Steels

2010 ◽  
Vol 638-642 ◽  
pp. 3374-3379 ◽  
Author(s):  
Hiroshi Matsuda ◽  
Hisata Noro ◽  
Yasunobu Nagataki ◽  
Yoshihiro Hosoya
Keyword(s):  
Mechanical Properties ◽  
Carbon Content ◽  
Retained Austenite ◽  
High Strain ◽  
Sheet Steels ◽  
Trip Steels ◽  
Austenite Stability ◽  
Retained Austenite Stability ◽  
The Stability ◽  
High Work

Industrial low alloy TRIP sheet steels contain blocky and lath-shaped retained austenite. In the present study, transformation behaviour of blocky and lath-shaped retained austenite during straining was investigated to clarify its effect on mechanical properties. Two types of TRIP steels containing almost the same amount but the different morphology of retained austenite were used. A steel containing large amount of lath-shaped retained austenite exhibits superior ductility, and sustains high work-hardenability in a high strain region. On the contrast, a steel containing large amount of blocky retained austenite exhibits low ductility. 　The work-hardenability increased steeply to the maximum at a low strain region, and then reduced in a high strain region. The stability of the blocky austenite has been found to be poor with respected to martensite transformation. The lath-shaped retained austenite remains until a high strain region whereas the blocky retained austenite transformed into martensite in a low strain region. Carbon content was higher in the lath-shaped retained austenite than in the blocky retained austenite. Stability of retained austenite is, however, inexplicable only by the carbon content, and would be affected by the different morphology and the resulting restraint conditions.

Effect of Different Coiling Temperature on Mechanical Properties in Hot Rolled TRIP Steel

2011 ◽  
Vol 239-242 ◽  
pp. 1092-1095
Author(s):  
Xu Tao Gao ◽  
Ai Min Zhao ◽  
Zheng Zhi Zhao ◽  
Ming Ming Zhang ◽  
Di Tang
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
X Ray Diffraction ◽  
Coiling Temperature ◽  
Experimental Steel ◽  
Transformation Induced Plasticity ◽  
X Ray ◽  
Trip Steels ◽  
Hot Rolled ◽  
Scanning Electron

By means of optical microscopy(OM), scanning electron microscopy(SEM),X-ray diffraction(XRD),And tensile test, Mechanical Properties of hot rolled transformation -induced plasticity (TRIP) steels which were prepared through three different coiling temperature was investigated. Result reveals that the formability index of the experimental steel descends when the coiling temperature becomes low. Different coiling temperature has greater impact on retained austenite. Amount and carbon content of retained austenite in the experimental steel get less with lower coiling temperature.

scholarly journals Effect of Retained Austenite and Non-Metallic Inclusions on the Mechanical Properties of Resistance Spot Welding Nuggets of Low-Alloy TRIP Steels

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1064 ◽  
Author(s):  
Víctor H. Vargas Cortés ◽  
Gerardo Altamirano Guerrero ◽  
Ignacio Mejía Granados ◽  
Víctor H. Baltazar Hernández ◽  
Cuauhtémoc Maldonado Zepeda
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Retained Austenite ◽  
High Strength ◽  
Microstructural Characterization ◽  
Spot Welds ◽  
Trip Steels ◽  
Resistance Spot ◽  
Lap Shear ◽  
Metallic Inclusions

The combination of high strength and formability of transformation induced plasticity (TRIP) steels is interesting for the automotive industry. However, the poor weldability limits its industrial application. This paper shows the results of six low-alloy TRIP steels with different chemical composition which were studied in order to correlate retained austenite (RA) and non-metallic inclusions (NMI) with their resistance spot welded zones to their joints’ final mechanical properties. RA volume fractions were quantified by X-ray microdiffraction (µSXRD) while the magnetic saturation technique was used to quantify NMI contents. Microstructural characterization and NMI of the base metals and spot welds were assessed using scanning electron microscopy (SEM). Weld nuggets macrostructures were identified using optical microscopy (OM). The lap-shear tensile test was used to determine the final mechanical properties of the welded joints. It was found that NMI content in the fusion zone (FZ) was higher than those in the base metal and heat affected zone (HAZ). Whereas, traces of RA were found in the HAZ of highly alloyed TRIP steels. Lap-shear tensile test results showed that mechanical properties of spot welds were affected by NMI contents, but in a major way by the decomposition of RA in the FZ and HAZ.

Effect of Retained Austenite Stability on Mechanical Properties of Bainitic Rail Steel

2014 ◽  
Vol 1004-1005 ◽  
pp. 198-202 ◽  
Author(s):  
Kai Kai Wang ◽  
Zhun Li Tan ◽  
Gu Hui Gao ◽  
Xiao Lu Gui ◽  
Bing Zhe Bai
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Retained Austenite ◽  
Rail Steel ◽  
High Impact ◽  
Good Thermal Stability ◽  
Austenite Stability ◽  
Retained Austenite Stability ◽  
Close Relationship ◽  
The Stability

Retained austenite has an important effect on strength and toughness of 20Mn2SiCrMo bainitic rail steel. In this work, the stability of retained austenite and mechanical properties have been studied. The results show that impact toughness of experimental steel has close relationship with the stability of retained austenite. When tempered at lower than 350°C, retained austenite owns good thermal stability, corresponding to relatively high impact toughness.

Effect of retained austenite and solute carbon on the mechanical properties in TRIP steels

2004 ◽  
Vol 350 (1-3) ◽  
pp. E467-E469 ◽  
Author(s):  
B.S Seong ◽  
E.J Shin ◽  
Y.S Han ◽  
C.H Lee ◽  
Y.J Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Trip Steels ◽  
Solute Carbon

Temperature Development during Step-Wise Tensile Tests on a TRIP Steel

2010 ◽  
Vol 638-642 ◽  
pp. 3579-3584
Author(s):  
Lie Zhao ◽  
Corinna Thomser ◽  
Kirsten Schneider ◽  
Wolfgang Bleck ◽  
Jilt Sietsma
Keyword(s):  
Trip Steel ◽  
Retained Austenite ◽  
Room Temperature ◽  
Longitudinal Direction ◽  
Tensile Tests ◽  
Transformation Induced Plasticity ◽  
Trip Steels ◽  
Loading Process ◽  
Temperature Development ◽  
The Stability

Temperature development during plastic deformation affects the stability of retained austenite and thus the mechanical properties in transformation-induced plasticity (TRIP) steels. In this work, we used a thermo-camera to monitor the temperature development during a step-wise tensile test of an Al-containing multiphase TRIP steel. The tensile tests were performed by loading the specimen at six straining rates ranging from 5 to 30 s-1 to a stress of 700 MPa and then holding for 15 min, followed by further loading at 50 s-1 until fracture. It is found that temperature increases about 13 – 18 °C during the first loading process and drops back to room temperature with a time-constant of around 2 min. The increment of temperature increases with increasing straining rate. The temperature increases around 30 °C during the second loading process. The distribution of temperature over the specimen surface is found to be rather homogeneous along the longitudinal direction in most cases, except for the ending points of two loading processes. The measurement of temperature development is found to be consistent with previous numerical simulation on the temperature development under constant stress in TRIP steels.

Linking Crystallographic, Chemical and Nano-Mechanical Properties of Phase Constituents in DP and TRIP Steels

2010 ◽  
Vol 638-642 ◽  
pp. 3465-3472 ◽  
Author(s):  
R. Arjan Rijkenberg ◽  
Maxim P. Aarnts ◽  
Floor A. Twisk ◽  
Marga J. Zuijderwijk ◽  
M. Knieps ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
Crack Initiation ◽  
Trip Steel ◽  
Retained Austenite ◽  
Trip Steels ◽  
Nano Indentation ◽  
Ebsd Data ◽  
Indentation Analysis

This paper discusses practical EBSD strategies for identification and partitioning of phase constituents in DP and TRIP microstructures including martensite, retained-austenite, bainite, intercritical and epitaxial ferrite. EBSD data is complemented with nano-indentation analysis, providing evidence of indentation-induced phase transformation of retained-austenite in TRIP steel and micro-crack initiation at the interface between ferrite and mechanically transformed martensite.

Ultra Fine-Grained 6wt% Manganese TRIP Steel

2010 ◽  
Vol 654-656 ◽  
pp. 286-289 ◽  
Author(s):  
Sea Woong Lee ◽  
Kyoo Young Lee ◽  
Bruno C. De Cooman
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Intercritical Annealing ◽  
High Volume ◽  
Magnetic Saturation ◽  
Trip Steels ◽  
Fine Grained ◽  
Annealing Temperatures

Ultra-fine grained TRIP steels (UFG-TRIP) containing 6wt%Mn were produced by intercritical annealing. An ultra-fine grained microstructure with a grain size less than 1μm was obtained. The formation mechanism of the high volume fraction of retained austenite was investigated by dilatometry, XRD and magnetic saturation. The fraction of retained austenite was strongly dependent on the annealing temperature. The tensile properties were also found to be strongly influenced by the annealing temperature with poorer mechanical properties being observed at higher annealing temperatures. It was found that the stabilization of the retained austenite was both a composition and size-effect, made possible by the grain refinement due to the reversely transformed martensite.

Sign in / Sign up

Export Citation Format

Share Document