Effect of intermediate temperature annealing on the stability of retained austenite and mechanical properties of medium Mn-TRIP steel

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.

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The Influence of the Substitution of Si by Al on the Properties of Hot Rolled C-Mn-Si TRIP Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.896.198 ◽

2017 ◽

Vol 896 ◽

pp. 198-201 ◽

Cited By ~ 1

Author(s):

Zhan Shan Wei ◽

Zhuang Li ◽

Wei Lv ◽

Zhen Yao Shao

Keyword(s):

Mechanical Properties ◽

Trip Steel ◽

Retained Austenite ◽

Polygonal Ferrite ◽

Granular Bainite ◽

Trip Effect ◽

Al Substitution ◽

The Stability ◽

Hot Rolled

The influence of the substitution of Si by Al on the properties of hot rolled C-Mn-Si TRIP steel was investigated by TMCP. The results have shown that the microstructures of the present steels consist of polygonal ferrite, granular bainite and retained austenite. The Al substitution of Si in a conventional C-Mn-Si TRIP steel leads to excellent mechanical properties (UTS>714MPa, A50>31%). TMCP led to the stability of the remaining austenite and a satisfactory TRIP effect. Excellent mechanical properties were obtained through tmcp for the hot rolled TRIP steel.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1004-1005.198 ◽

2014 ◽

Vol 1004-1005 ◽

pp. 198-202 ◽

Cited By ~ 1

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.

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EFFECT OF C-Mn PARTITIONING ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TRIP STEEL

Materiali in tehnologije ◽

10.17222/mit.2020.181 ◽

2021 ◽

Vol 55 (2) ◽

pp. 269-275

Author(s):

Cainian Jing ◽

Qiteng Lei ◽

Tao Lin ◽

Daomin Ye ◽

Cong Wu ◽

...

Keyword(s):

Mechanical Properties ◽

Trip Steel ◽

Retained Austenite ◽

Lath Martensite ◽

Tensile Tests ◽

Microstructure And Mechanical Properties

In this paper, the TRIP590 steel was used for C-Mn partitioning. The influence of C-Mn partitioning on the microstructure and mechanical properties of the steel was studied. SEM, EPMA, XRD and tensile tests were used to characterize the microstructure of the tested steel, calculate the content of retained austenite, and analyze the enrichment of C atoms and Mn atoms and mechanical properties. The results show that there was a lot of lath martensite and scattered ferrite in the microstructures of the Q&P steel and C-Mn partitioning steel. After C-Mn partitioning, the content of ferrite was increased. The enrichment of C and Mn in the C-Mn partitioning steel was relatively apparent, and the concentration of the atoms in the center of martensite was significantly higher than at the boundary between martensite and ferrite. Mn-rich areas were also C-rich areas. Compared with the Q&P steel, the C-Mn partitioning steel had a larger amount of retained austenite, higher elongation and PSE.

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The Effect of Isothermal Hold Temperature on Microstructure and Mechanical Properties of TRIP Steel

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.270.253 ◽

2017 ◽

Vol 270 ◽

pp. 253-257 ◽

Cited By ~ 2

Author(s):

Ludmila Kučerová ◽

Martin Bystrianský ◽

Josef Káňa

Keyword(s):

Mechanical Properties ◽

Trip Steel ◽

Retained Austenite ◽

Mechanical Treatment ◽

Volume Fraction ◽

Carbon Steels ◽

Processing Route ◽

Isothermal Hold ◽

Low Carbon ◽

Thermo Mechanical Treatment

TRIP (transformation induced plasticity) steels are low alloyed low carbon steels with complex microstructures consisting of ferrite, bainite and retained austenite. This complex microstructure provides them with excellent strength to ductility balance, making them a member of advanced high strength steels (AHSS) group. Suitable microstructure can be obtained by either heat or thermo-mechanical treatment. A hold in bainite transformation region is an integral part of any form of commercial TRIP steel processing route, as it enables formation of sufficient volume fraction of bainite and also stabilization of retained austenite in the final microstructure. Various bainitic hold temperatures ranging from 350 °C to 500 °C were tested within thermo-mechanical treatment of 0.2C-1.5Mn-0.6S-1.5Al steel and the final microstructures were evaluated with regard to the suitability to TRIP effect and achieved mechanical properties. The microstructures were analyzed by scanning electron microscopy and mechanical properties measured by tensile test.

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Study on Microstructures and Mechanical Properties of Cold-Rolled C-Mn-Si-Al TRIP Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.146-147.678 ◽

2010 ◽

Vol 146-147 ◽

pp. 678-681

Author(s):

Zheng You Tang ◽

Hua Ding

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Trip Steel ◽

Retained Austenite ◽

Volume Fraction ◽

Total Elongation ◽

Partial Substitution ◽

Cold Rolled ◽

Microstructures And Mechanical Properties

The effect of the partial substitution of Si by Al on the microstructures and the mechanical properties of cold rolled C-Mn-Si TRIP steel was investigated. The results show that the partial substitution of Si by Al could refine the microstructures, increase the volume fraction of ferrite and retained austenite. In addition, the excellent mechanical properties of the Al partial substituted TRIP steel could be obtained, the tensile strength, total elongation and strength-ductility of C-Mn-Si-Al TRIP steel are 739MPa, 38% and 28082MPa%, respectively.

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Intensification of the Transition of Retained Austenite to Martensite Effected by Changing the Stress State in Trip Steel Wires / Intensyfikacja Przemiany Austenitu Szczątkowego W Martenzyt Pod Wpływem Zmiany Stanu Naprężenia W Drutach Ze Stali Typu Tr Ip

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0439 ◽

2015 ◽

Vol 60 (4) ◽

pp. 2729-2732

Author(s):

S. Wiewiórowska ◽

Z. Muskalski ◽

W. Ciepiela

Keyword(s):

Mechanical Properties ◽

Stress State ◽

Trip Steel ◽

Retained Austenite ◽

Cyclic Stresses ◽

Steel Wires ◽

Steel Grades ◽

External Stresses ◽

Rotating Bending

Change in the stress state is one of the factors that determined the transition of retained austenite to martensite. It has been proved that in products made from wires of a TRIP structure, which is characterized by a high retained austenite content, loading them with varying in sign cyclic stresses of magnitudes lower than yield strength (R0.2) results in intensive transition of the retained austenite to martensite. The paper presents a comparative analysis of investigation results concerning the determination of the quantity of retained austenite in the structure of wire for two TRIP steel grades with varying carbon content after they have been loaded with varying in sing cyclic stresses of a magnitude smaller than R0.2 under rotating bending conditions. The investigation carried out has determined whether and, if so, to what extent the loading of wire with cyclic external stresses of magnitudes lower than R0.2 may influence the quantity of transformed retained austenite and thus the mechanical properties of the products.

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.638-642.3579 ◽

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.

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.638-642.3465 ◽

2010 ◽

Vol 638-642 ◽

pp. 3465-3472 ◽

Cited By ~ 2

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.

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