Strengthening 42CrMo4 steel by isothermal transformation below martensite start temperature

Feng, Jian; Frankenbach, Timo; Wettlaufer, Marc

doi:10.1016/j.msea.2016.12.013

Cited by 44 publications

(24 citation statements)

References 25 publications

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“…It is known that the transgranular quasi-cleavage fracture mode is associated with the tempered martensite embrittlement (TME) mechanism, which occurs at the tempering temperature, ranging from 200 to 380 °C, in low/medium carbon and alloy steels due to the transformation of retained austenite at lath martensite boundaries [ 60 , 61 ]. This interlath austenite transforms to coarse cementite crystals, and cementite nucleates on the martensite boundaries, which induces large lattice distortions and a high density of dislocations that can act as crack nucleation sites and, therefore, reduces impact toughness and ductility [ 62 , 63 ].…”

Section: Resultsmentioning

confidence: 99%

Tensile Fracture Behavior and Failure Mechanism of Additively-Manufactured AISI 4140 Low Alloy Steel by Laser Engineered Net Shaping

et al. 2017

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AISI 4140 powder was directly deposited on AISI 4140 wrought substrate using laser engineered net shaping (LENS) to investigate the compatibility of a LENS-deposited part with the substrate. Tensile testing at room temperature was performed to evaluate the interface bond performance and fracture behavior of the test specimens. All the samples failed within the as-deposited zone, indicating that the interfacial bond is stronger than the interlayer bond inside the deposit. The fracture surfaces were analyzed using scanning electron microscopy (SEM) and energy disperse X-ray spectrometry (EDS). Results show that the tensile fracture failure of the as-deposited part is primarily affected by lack-of-fusion defects, carbide precipitation, and oxide particles inclusions, which causes premature failure of the deposit by deteriorating the mechanical properties and structural integrity.

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Section: Resultsmentioning

confidence: 99%

Tensile Fracture Behavior and Failure Mechanism of Additively-Manufactured AISI 4140 Low Alloy Steel by Laser Engineered Net Shaping

et al. 2017

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“…Discussed in a previous work, [19] the direct and indirect enhancement of the yield strength may occur in multiphase metallic systems. The former is based on the load transfer between the matrix and particles and can be explained by various continuum models, such as the shear-lag model of Cox, [20] the homogenization methods, [21] etc.…”

Section: Size Effects On the Joint Strengthmentioning

confidence: 95%

“…[19] The first contribution is the classic Orowan-stress t OR [22] and the size-dependence function is given by [19] The first contribution is the classic Orowan-stress t OR [22] and the size-dependence function is given by…”

Section: Size Effects On the Joint Strengthmentioning

confidence: 99%

Size Effects in Continuous Drive Friction Welded Spray‐Compacted Hypereutectic Al–Si Alloys

Feng

Wettlaufer

2017

Adv Eng Mater

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Spray-compacted hypereutectic Al-Si alloy is one of the most important lightweight materials for casting components in electric vehicles. Size effects in such alloys jointed by continuous drive friction welding have been investigated by connecting the interfacial microstructure with the joint strength. The nature of phases present, the topology, and the dispersion of particles have been examined carefully. The mechanical properties of joints have been characterized by transverse tensile tests, microhardness tests, XRD residual stress measurements, and finite element simulations. Size effects on the strengthening of the joint strength and the fracture of particles have been evaluated qualitatively and quantitatively. It has been confirmed that the micromechanical strengthening, which is related to the average particle size d and proportional to d À0.5 , and the residual stress together determine the joint strength. By means of the fracture-mechanical analysis, a lower and an upper limit of the particle size have been defined to assess whether a particle can be refined or not during continuous drive friction welding.

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“…Finally, chemical etching was applied with 4% nital solution for 5 s and with 8% sodium metabisulfite solution for 40 s. The goal is to distinguish the bainitic phase from martensite. The result of this preparation is a light brown background corresponding to martensite and a blue background, often dark or blackened for bainite [21][22][23].…”

Section: Work Materials Characterizationmentioning

confidence: 99%

Metallurgical Analysis of Chip Forming Process when Machining High Strength Bainitic Steels

Haddad

Lescalier

Desaigues

et al. 2019

JMMP

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In the following work, we propose a metallurgical approach to the chip formation process. We focus on a turning application of high strength steel in which chips are produced by adiabatic shear bands that generate cutting force signals with high frequency components. A spectral analysis of these signals is applied and highlights peaks above 4 kHz depending on the cutting conditions. A microscopic analysis on the chip sections provided data on chip breaking and serration mechanisms. Shear band spacing and excitation frequency of the whole cutting system were calculated and gave a good correlation with cutting forces spectra.

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Strengthening 42CrMo4 steel by isothermal transformation below martensite start temperature

Cited by 44 publications

References 25 publications

Tensile Fracture Behavior and Failure Mechanism of Additively-Manufactured AISI 4140 Low Alloy Steel by Laser Engineered Net Shaping

Tensile Fracture Behavior and Failure Mechanism of Additively-Manufactured AISI 4140 Low Alloy Steel by Laser Engineered Net Shaping

Size Effects in Continuous Drive Friction Welded Spray‐Compacted Hypereutectic Al–Si Alloys

Metallurgical Analysis of Chip Forming Process when Machining High Strength Bainitic Steels

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