The effect of hydrogen content on the microstructure, mechanical properties, and fracture mechanisms low-carbon lath martensitic steel was investigated using both experimental methods atomistic modeling. Tensile testing revealed a transition in behavior with increases concentration. Specifically, at 0.44 wppm, shift from transgranular to intergranular fractures observed. most probable cause embrittlement identified be HELP-mediated HEDE. As concentration increased, dislocation density...

The electroless nickel (Ni) and composite – nanodiamond (Ni+DND) coatings are investigated in this study. method EFTTOM-NICKEL for plating with nanosized strengthening particles (DND 4-6 nm) is applied the coating deposition. deposited on ferrous alloys samples. wear resistance of performed by friction tests under 50-400 MPa loading conditions accordance a Polish Standard PN-83/H-04302. microstructure observations made optic metallographic microscope GX41 OLIMPUS microhardness determined...

The wear resistance, microstructure and mechanical properties of austempered ductile iron (ADI) with nanosized additives cubic boron nitride cBN are investigated. Samples put under austhempering at the following conditions: heating 900°С, 1 h isothermal retention 280оС, 2 380°С, aim to achieve a lower bainitic structure an upper structure. experimental testing irons is performed in friction conditions fixed abrasive by cinematic scheme "pin - disc" using accelerated method device. ADI...

A technology to improve the tribological and mechanical surface properties of iron alloys is developed based on electroless nickel plating.The combines sol-gel deposition technique.Novel nanocomposite coatings are obtained consisting Nickel-phosphorusnanodiamond (Ni-P-ND).The ND sol added directly Ni-P solution.A suitable surfactant achieve well-dispersed particles in solution facilitate their embodiment equal distribution coating.Substrates steel 17CrNiMo6 spheroidal graphite cast irons...

The microstructure and phase composition of high chromium white cast iron with composition: 2.6÷3.1%C; 0.88÷1.12%Si; 0.74÷0.98% Mn; 0.85÷1.16% Mo; 11.11÷14.11% Cr, additionally doped boron in an amount 0.002%, 0.92% 1.34% is investigated. the irons was studied by optical metallographic analysis, – qualitative XRD analysis. An impact toughness test conducted. hardness HRC tested Rockwell method. microhardness HV0.1 metal matrix carbide determined. It found that samples containing boron,...

The wear behavior of high chromium white cast irons with composition: 2,6÷3,4% C; 0,9÷1,1% Si; 0,8÷1,1% Mn; 1,0÷1,3% Mo; 12,3÷13,4% Cr and 0,18 ÷ 1,25% B is investigated. microstructure tribological characteristics six compositions (one without boron 0,18; 0,23; 0,59; 0,96; boron) are studied.After casting, heat treatment was carried out, including quenching at 9500C tempering 2350C for 1 h. influence the heating temperature in interval 850÷11000С, 25 min on Rockwell hardness studied.The...

The microstructure and mechanical properties of high chromium white cast iron with composition: 2,6÷3,4% C; 0,9÷1,1% Si; 0,8÷1,1% Mn; 1,0÷1,3% Mo; 12,3÷13,4% Cr, additionally doped boron in an amount 0,18% to 1,25% is investigated. six compositions irons studied by means optical metallographic analysis - one without boron, the others contain 0,18%; 0,23%; 0,59%; 0,96% boron. A test performed determine: hardness Rockwell method; microhardness; bending strength impact toughness. It was found...

The microstructure and properties of spheroidal graphite cast irons austempered ductile with nanosized additives titanium carbonitride nitride (TiCN+TiN), TiN cubic boron cBN are investigated. the patterns is observed by optical metallography, quantity metallographic analysis, X-Ray SEM analysis EDX analysis. Hardness measurement, impact strength abrasion wear test on fixed abrasive performed. influence microstructure, mechanical tribological examined.

The work in this study is focused on investigation of the tribological behavior ductile cast iron with nanosized particles: titanium nitride TiN; 30% + carbonitride 70% (30%TiN+70%TiCN). composition is: Fe-3,55C-2,67Si-0,31Mn-0,009S-0,027P-0,040Cu-0,025Cr-0,08Ni-0,06Mg wt%. Before addition to melt particles were coated nickel by electroless deposition method EFFTOMNICKEL .The coating ensures their wetting as well uniform distribution into cast. optical and quantity metallographic...

Composite nickel coatings composed of Ni; Ni + TiN are studied. The method for elecrtroless deposition EFFTOM-NICKEL with nanosized strengthening particles (50nm) is applied. deposited on austempered ductile iron (ADI) samples. composition cast samples is: Fe-3,63C-2,59Si-0,30Mn-0,010S-0,034P-0,53Cu wt. %. put under isothermal hardening at 900oС an hour and retention 290 oС 2 hours the aim to receive a lower bainite structure. wear resistance experimental testing carried out using...

In this paper metallographic, mechanical and tribological tests of spheroidal graphite cast iron with applied nanosized additives titanium nitride + carbonitride (TiN TiCN), TiN cubic boron cBN are perfomed.With the aim to achieve upper bainite structure, samples put under austhempering at following conditions: heating 900 °С, 1 h isothermal retention 380 2 h.In order wear resistance, resulting structure has similar properties as martensitic but improved toughness.By X-ray analysis before...

The investigation on the structure formation in bainitic area for high-speed steel HS18-0-1 is performed.The austempering carried out at 270 °С after austenitizing 1280 following by isothermal retention of high resistance undercooled austenite(500÷650°С).The kinetic transformation, obtained means optical metallography (OM), transmission electron microscope (TEM), X-ray analysis and hardness measurement Rockwell method are studied.The influence preliminary destabilisation austenite 560 °C 650...