hydrogen-assisted microcrack formation in bearing steels

There has been a great deal of work on the formation of hard white-etching regions in conventional bearing steels such as 1C-1 5Cr wt% when subjected repeatedly to rolling contact stresses The regions are a consequence of localised mechanical attrition across microcrack faces and mixing which refine the local structure and force cementite to Overheating damage can be caused by Stress concentrations can lead to initiation of cracking by fatigue stress corrosion or hydrogen-assisted stress corrosion Discoloration of the enamel primer or chrome or evidence of cadmium damage ateel the inner diameter of the axle steel require the heat-damaged component be removed from service

Steels for bearings

Lean Steels: Microstructure Steels with carbon concentrations in the range 0 8-1 1 wt% and the total substitutional solute content less than 3 wt% designed originally for machining tools have historically dominated the mass market for bearings [ s10 9] They can be made martensitic by quenching in oil or salt from a temperature where the material is mostly austenite

HYDROGEN ASSISTED CRACKING OF HIGH STRENGTH ALLOYS Richard P Gangloff 4/1/03 Page 85 of 194 HEAC in the high strength steel/H 2 system parallels the temperature dependence of IHAC in such alloys as illustrated by the data in Fig 34 for ultra-high strength 18Ni (250) Maraging steel in pure H 2 at two pressures (Gangloff and Wei 1977 1978)

The objective of this study was to characterize hydrogen-assisted crack propagation in gas-tungsten arc (GTA) welds of the nitrogen-strengthened austenitic stainless steel 21Cr-6Ni-9Mn (21-6-9) using fracture mechanics methods The fracture initiation toughness and crack growth resistance curves were measured using fracture mechanics specimens that were thermally precharged with 230 wppm (1

storage of plutonium bearing materials (DOE 1996) specifies a maximum temperature of 100C for of 1000 ppm drastically reduce microcrack formation during casting (Nelson 1966) Thus the The gages were bonded to the stainless steel using M-Bond 600 an epoxy good to 370 C The epoxy was cured at 75 C for at least 12 hours A

The metastable austenitic stainless steel 304L shows a very pronounced transient behavior and a fatigue limit in the VHCF regime The higher SFE of the 316L steel results in a less pronounced transient cyclic deformation behavior The plastic shear is more localized and the formation of deep intrusions leads to microcrack initiation However the

SOME MICROSTRUCTURAL ASPECTS OF TRANSVERSE CRACK

FORMATION IN CONTINUOUSLY CAST STEELS Jiř Pavliska Zdeněk Jonšta Karel Mazanec Technical University Ostrava Institute of Materials Engineering 17 listopadu 15 708 33 Osrava – Poruba ČR Abstract Transverse crack in continuously cast steels can form if the hot ductility of cast steel at the straightening operation is low

other aspects of hydrogen in steel weldments and a review of various methods for the measurement of hydrogen in weldments 2 HAC in steel weldments 2 1 Causes Consequenses Hydrogen assisted cracking (HAC) also known as cold cracking or delayed cracking or underbead cracking is one of the most prevalent problems encountered in the

other aspects of hydrogen in steel weldments and a review of various methods for the measurement of hydrogen in weldments 2 HAC in steel weldments 2 1 Causes Consequenses Hydrogen assisted cracking (HAC) also known as cold cracking or delayed cracking or underbead cracking is one of the most prevalent problems encountered in the

Overheating damage can be caused by Stress concentrations can lead to initiation of cracking by fatigue stress corrosion or hydrogen-assisted stress corrosion Discoloration of the enamel primer or chrome or evidence of cadmium damage ateel the inner diameter of the axle steel require the heat-damaged component be removed from service

Hydrogen induced crack formation at notch in tensile tested TRIP-steel Second a more fundamental investigation of hydrogen induced cracking was performed on pure iron Advanced characterization techniques allow to assess the crack initiation and propagation mechanisms occurring during hydrogen induced cracking

Jan 07 2020Both normalized SAE-AISI and SAE-AISI M steel are iron alloys There are 10 material properties with values for both materials Properties with values M is a low alloy vacuum melted steel of very high strength and toughness It is a modified steel with silicon vanadium and slightly greater carbon and M high strength low alloy steel

There has been a great deal of work on the formation of hard white-etching regions in conventional bearing steels such as 1C-1 5Cr wt% when subjected repeatedly to rolling contact stresses The regions are a consequence of localised mechanical attrition across microcrack faces and mixing which refine the local structure and force cementite to

The same load was applied to all-steel and hybrid bearing tests which results in a higher Hertzian contact stress in the hybrid bearing cases because of the higher elastic modulus of the Si3N4balls [25-27] The same load was applied to allow rotation of all-steel and hybrid tests between different RCF test stations for statistical accuracy

Hydrogen embrittlement of X80 pipeline steel in H 2 S

This study investigated the susceptibility of X80 pipeline steel to hydrogen embrittlement given different hydrogen pre-charging times and hydrogen charging–releasing–recharging cycles in H 2 S environment The fracture strain of the steel samples decreased with increasing hydrogen pre-charging time this steel degradation could almost be recovered after diffusible hydrogen was removed

steel parts Corrosion has a huge economic impact About a fifth of the world's annual steel production goes towards simply replacing steel parts damaged by corrosion Even though it may involve higher up-front cost correct and efficient corrosion protection at the

Q235 steel while the rubber plates were possessed with thickness of 8 mm and smooth surface without burr scratch and concave-convex structure Test methods The friction test was conducted on the mechanical static friction test platform developed by the College of

Thus in this work effects of different CeO 2 contents on melting temperature viscosity and structure of the CaF 2-bearing mold fluxes and the B 2 O 3-containing mold fluxes for casting the rare earth alloy heavy rail steels were investigated systemically Besides the mechanisms of

steel had 540N /mm2 grade stretch-flangebility of conventional steel Appearance of sheared edge of 540 N/mm2 developed steel is shown in Fig 7 compared with that of columbium bearing steel The developed steel reflected smooth shape but the columbium bearing steel reflected creviced shape by micro-cracks joining (a) : Conventional stee

Understanding the hydrogen-assisted cracking in multiphase steels is of scientific and engineering importance A combination of scanning electron microscopy (SEM) and scanning probe microscopy (SPM) is applied to investigate the micromorphology of fracture surface and microcrack formation in hydrogen-precharged super duplex stainless steel

I also co-authored a research paper titled "Hydrogen-assisted microcrack formation in bearing steels under rolling contact fatigue" which was published in the International Journal of Fatigue in 2020 Show more Show less Publications Hydrogen-assisted microcrack formation in bearing steels under rolling contact fatigue Elsevier January 21

The metastable austenitic stainless steel 304L shows a very pronounced transient behavior and a fatigue limit in the VHCF regime The higher SFE of the 316L steel results in a less pronounced transient cyclic deformation behavior The plastic shear is more localized and the formation of deep intrusions leads to microcrack initiation However the

In-situ mass spectrometry was conducted to study possible tribochemical reactions with the steel bearing surface The degradation oft he MAC fluid was correlated with the formation of gaseous reaction products including hydrogen and various alkanes and alkenes An oxidation reaction between the lubricant and metal oxides was identified

to contain maximum 0 10 percent vanadium The sulfur content of the 4340 VAR steel was 0 001 % or less The hardness of the 4340 VAR crankshaft steel ranged from 32 7 to 35 8 HRc which correspond to tensile strengths between about 148 and 160 ksi The crankshaft consists of six crankpin journals four main bearing journals and

There has been a great deal of work on the formation of hard white etching regions in conventional bearing steels such as 1C-1 5Cr wt% when subjected repeatedly to rolling contact stresses The regions are a consequence of localised mechanical attrition across microcrack faces and mixing which re ne the local structure and force cementite to

Cracks microcracks and fracture in polymer structures: Formation detection autonomic repair Firas Awajaa b ⇑ Shengnan Zhangc Manoj Tripathia Anton Nikiforovd Nicola Pugnoe a f a Centre for Materials and Microsystems Fondazione Bruno Kessler via Sommarive 18 I-38123 Trento Italy bDepartment of Orthopaedic Surgery Medical University of Innsbruck Innrain 36 Innsbruck Austria