Influence of Martensite Fraction on Tensile Properties of Quenched and Partitioned (Q&amp;P) Martensitic Stainless Steels

Huang, Qingfei; Schröder, Christina; Biermann, Horst; Volkova, Olena

doi:10.1002/srin.201500472

Cited by 36 publications

(16 citation statements)

References 84 publications

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“…In the present case, such stresses can develop during processing steps where γ and α′ coexist. These are, on the one hand, temperatures below the martensite start temperature of the steel (~ 138 °C, 53 ) as the steel is oil cooled from the solution annealing temperature and, on the other hand, during heating from RT to 350 °C for neutron diffraction measurements. Cooling will have an additional contribution due to the expansion associated with martensitic transformation.…”

Section: Resultsmentioning

confidence: 99%

Neutron diffraction analysis of stress and strain partitioning in a two-phase microstructure with parallel-aligned phases

Huang

Shi

Muránsky

et al. 2020

Sci Rep

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By time-of-flight (TOF) neutron diffraction experiments, the influence of segregation-induced microstructure bands of austenite (γ) and martensite (α′ ) phases on the partitioning of stress and strain between these phases was investigated. Initially, tensile specimens of a Co-added stainless steel were heat treated by quenching and partitioning (Q&P) processing. Tensile specimens were subsequently loaded at 350 °C parallel to the length of the bands within the apparent elastic limit of the phase mixture. Lattice parameters in both axial and transverse directions were simultaneously measured for both phases. The observation of a lattice expansion for the γ phase in the transverse direction indicated a constraint on the free transverse straining of γ arising from the banded microstructure. The lateral contraction of α′ imposed an interphase tensile microstress in the transverse direction of the γ phase. The multiaxial stress state developed in the γ phase resulted in a large deviation from the level of plastic strain expected for uniaxial loading of single phase γ. Since segregation-induced banded microstructures commonly occur in many engineering alloys, the analysis of stress and strain partitioning with the present Q&P steel can be used to interpret the observations made for further engineering alloys with two-phase microstructures.

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Section: Resultsmentioning

confidence: 99%

Neutron diffraction analysis of stress and strain partitioning in a two-phase microstructure with parallel-aligned phases

Huang

Shi

Muránsky

et al. 2020

Sci Rep

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“…For Fe–13Cr steels with carbon concentrations similar to the 0.5C alloy of the present work, the full dissolution of carbides has been shown to occur at temperatures up to 1180 °C [ 34 , 42 , 62 ]. For alloys with higher carbon concentrations, the DSC results indicated that carbides persist in the microstructure at 1180 °C.…”

Section: Resultsmentioning

confidence: 99%

Influence of Carbon on the Microstructure Evolution and Hardness of Fe–13Cr–xC (x = 0–0.7 wt.%) Stainless Steel

et al. 2021

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The influence of carbon on the phase transformation behavior of stainless steels with the base chemical composition Fe–13Cr (wt.%), and carbon concentrations in the range of 0–0.7 wt.%, was studied at temperatures between −196 °C and liquidus temperature. Based on differential scanning calorimetry (DSC) measurements, the solidification mode changed from ferritic to ferritic–austenitic as the carbon concentration increased. The DSC results were in fair agreement with the thermodynamic equilibrium calculation results. In contrast to alloys containing nearly 0% C and 0.1% C, alloys containing 0.2–0.7% C exhibited a fully austenitic phase stability range without delta ferrite at high temperatures. Quenching to room temperature (RT) after heat treatment in the austenite range resulted in the partial transformation to martensite. Due to the decrease in the martensite start temperature, the fraction of retained austenite increased with the carbon concentration. The austenite fraction was reduced by cooling to −196 °C. The variation in hardness with carbon concentration for as-quenched steels with martensitic–austenitic microstructures indicated a maximum at intermediate carbon concentrations. Given the steady increase in the tetragonality of martensite at higher carbon concentrations, as confirmed by X-ray diffraction measurements, the variation in hardness with carbon concentration is governed by the amount and stability of austenite.

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“…After the Q&P process, the stainless steel exhibited outstanding mechanical properties including yield strength of 1,050 ± 12 MPa, an ultimate tensile strength of 1,550 ± 10 MPa, and a tensile elongation of 22 ± 0.3% at room temperature. Huang et al [17] analyzed the Fe-Cr-C, Fe-Cr-C-Co and Fe-Cr-C-N stainless steels with the Q&P technology. The results showed that about 12% of the total contained carbon in the martensite partitioned into the austenite between 20 and 200°C, and the formation of tempered carbides was one of the main causes of carbon segregation.…”

Section: Introductionmentioning

confidence: 99%

Effects of quenching and partitioning (Q&P) technology on microstructure and mechanical properties of VC particulate reinforced wear-resistant alloy

Zhang

Zeng

2020

High Temperature Materials and Processes

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To improve the wear resistance, toughness, and hardness of alloy, the quenching and partitioning (Q&P) technology was applied in the VC particulate (VCp) reinforced wear-resistant alloys, which were prepared by adding different Mn contents (2–5 wt%). The effects of partitioning time on the distribution of alloying elements shown by EDX mapping, retained austenite fraction, microstructure, macro-hardness, and impact toughness were investigated. The results showed that the effect of carbon partitioning time on the hard phase of the wear-resistant alloy was not significant. However, the carbon partitioning time greatly affected the microstructure and the mechanical properties of alloys, such as retained austenite, hardness, and impact toughness, and there was also a strong correlation with the Mn content. When the Mn content was lower (2.51 wt%), the retained austenite content increased with the carbon partitioning time, which resulted in decreased hardness and increased impact toughness. However, when the Mn content was higher (4.52 wt%), the opposite results occurred. This study provided an application of the Q&P technology in a VCp-reinforced wear-resistant alloy.

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Influence of Martensite Fraction on Tensile Properties of Quenched and Partitioned (Q&P) Martensitic Stainless Steels

Cited by 36 publications

References 84 publications

Neutron diffraction analysis of stress and strain partitioning in a two-phase microstructure with parallel-aligned phases

Neutron diffraction analysis of stress and strain partitioning in a two-phase microstructure with parallel-aligned phases

Influence of Carbon on the Microstructure Evolution and Hardness of Fe–13Cr–xC (x = 0–0.7 wt.%) Stainless Steel

Effects of quenching and partitioning (Q&P) technology on microstructure and mechanical properties of VC particulate reinforced wear-resistant alloy

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