Effect of Holding Temperature on Microstructure and Mechanical Properties of High‐Strength Multiphase Steel

Hou, Ziyong; Wu, Di; Zheng, S.; Xiao, Yang; Li, Zhuang; Xu, Yun Bo

doi:10.1002/srin.201500331

Cited by 7 publications

(4 citation statements)

References 27 publications

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“…The YS varies from 1237 ± 19 to 1290 ± 18 MPa as the austenitizing temperature increases from 1000 to 1060 °C, and 1000-P has the highest YS, as can be seen in Table 2 . In view of M 23 C 6 carbides being submicron-sized in the three samples, the contribution of precipitation strengthening on YS is very weak, less than 5 MPa, and could thus be ignored [ 31 , 32 ]. Hence, the highest YS of 1000-P is mainly due to the finest grain and lowest fraction of the soft phase RA among all the partitioned samples [ 33 , 34 , 35 ].…”

Section: Resultsmentioning

confidence: 99%

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Effects of Austenitizing Temperature on Tensile and Impact Properties of a Martensitic Stainless Steel Containing Metastable Retained Austenite

et al. 2021

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Austenitizing temperature is one decisive factor for the mechanical properties of medium carbon martensitic stainless steels (MCMSSs). In the present work, the effects of austenitizing temperature (1000, 1020, 1040 and 1060 °C) on the microstructure and mechanical properties of MCMSSs containing metastable retained austenite (RA) were investigated by means of electron microscopy, X-ray diffraction (XRD), as well as tensile and impact toughness tests. Results suggest that the microstructure including an area fraction of undissolved M23C6, carbon and chromium content in matrix, prior austenite grain size (PAGS), fraction and composition of RA in studied MCMSSs varies with employed austenitizing temperature. By optimizing austenitizing temperature (1060 °C for 40 min) and tempering (250 °C for 30 min) heat treatments, the MCMSS demonstrates excellent mechanical properties with the ultimate tensile strength of 1740 ± 8 MPa, a yield strength of 1237 ± 19 MPa, total elongation (ductility) of 10.3 ± 0.7% and impact toughness of 94.6 ± 8.0 Jcm−2 at room temperature. The increased ductility of alloys is mainly attributed to the RA with a suitable stability via a transformation-induced plasticity (TRIP) effect, and a matrix containing reduced carbon and chromium content. However, the impact toughness of MCMSSs largely depends on M23C6 carbides.

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Section: Resultsmentioning

confidence: 99%

“…Considering their large size, the contribution of M 23 C 6 carbides to work hardening caused by inhibiting the dislocation motion can be ignored [ 31 , 32 ]. Thus, the role of M 23 C 6 carbides in improving UE is insignificant as well.…”

Section: Discussionmentioning

confidence: 99%

Effects of Austenitizing Temperature on Tensile and Impact Properties of a Martensitic Stainless Steel Containing Metastable Retained Austenite

et al. 2021

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“…However, it has not yet been used successfully for complex press-formed parts such as automobile chassis or wheels, partly because of low stretch-flangeability. Ferrite-Martensite-Dual-phase (FMDP) steels have been heavily used as the high strength parts to provide excellent crash energy absorption as well as anti-intrusion in traffic collision [15]. High bainite dual phase (HBDP) steel has been evoking much interest, and the appropriate microstructures to improve the stamping operations can be produced by the application of TMCP [16].…”

Section: Introductionmentioning

confidence: 99%

Study of Microstructure and Mechanical Properties of Hot-Rolled Ultra-High Strength Ferrite-Bainite Dual Phase Steel

2018

MSF

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Effects of thermo-mechanical control processing (TMCP) on microstructure and mechanical properties of hot-rolled ultra-high strength ferrite-bainite dual phase steel were investigated on a laboratory hot rolling mill. The results have shown that the microstructure containing ferrite and bainite can be obtained by TMCP. Ultimate tensile strength of all the specimens exceeded 1000MPa. Finish rolling temperatures affect the mechanical properties of ultra-high strength ferrite-bainite dual phase steel. Ultimate tensile strength reached 1078MPa at relatively low finish rolling temperature because of the ferrite grains refined. Fast cooling after low temperature rolling results in the ferrite grains refined and the formation of martensite islands. As a result, the product of ultimate tensile strength and total elongation (Rm×A50) of specimen 4 with fast cooling after low temperature rolling reaches the maximum value (18096MPa%).

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“…Figure4shows the microstructure of the bainite structure after 120 hours isothermal transformation. By method of comparison the microstructure of 24 hours, 72 hours, and 120 hours isothermal transformation it is apparent that the holding time has a positive effect on the microstructure fineness[18]. It is well known that the amount of bainite volume fraction is depending on the isothermal holding time.…”

mentioning

confidence: 99%

Designing, Processing and Isothermal Transformation of Al-Si Medium Carbon Ultrafine High Strength Bainitic Steel

Rahman

Shash

El-Fawkhry

et al. 2017

DDF

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Medium-carbon, silicon-rich steels are commonly suggested to obtain a very fine bainitic microstructure at a low temperature slightly above Ms. Thereby, the resulted microstructure consists of slender bainitic-ferritic plates interwoven with retained austenite. The advanced strength and ductility package of this steel is much dependent on the fineness of bainitic ferrite, as well as the retained austenite phase. In this article, the aluminum to silicon ratio, and the isothermal transformation temperature have been adopted to obtain ultra-high strength high carbon steel. Optical and SEM investigation of the produced steels have been performed. XRD has been used to track the retained austenite development as a result of the change in the chemical composition of developed steels and heat treatment process. Mechanical properties in terms of hardness and microhardness of obtained phases and structure were investigated. Results show that the increment of aluminum to silicon ratio has a great effect in promoting the bainitic transformation, in tandem with improving the stability and the fineness of retained austenite. Such an advanced structure leads to enhancement in the whole mechanical properties of the high carbon steel.

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Effect of Holding Temperature on Microstructure and Mechanical Properties of High‐Strength Multiphase Steel

Cited by 7 publications

References 27 publications

Effects of Austenitizing Temperature on Tensile and Impact Properties of a Martensitic Stainless Steel Containing Metastable Retained Austenite

Effects of Austenitizing Temperature on Tensile and Impact Properties of a Martensitic Stainless Steel Containing Metastable Retained Austenite

Study of Microstructure and Mechanical Properties of Hot-Rolled Ultra-High Strength Ferrite-Bainite Dual Phase Steel

Designing, Processing and Isothermal Transformation of Al-Si Medium Carbon Ultrafine High Strength Bainitic Steel

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