Journal of Materials Processing Technology: Preface

Experimental study of diffusion welding/bonding of titanium to copper

Abstract Around 1,000 peer-reviewed papers were selected from 3,450 articles published during 2020–2021, and reviewed as the representative advances in tribology research worldwide. The survey highlights the development in lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology, providing a show window of the achievements of recent fundamental and application researches in the field of tribology. 

/pdf/a-review-of-advances-in-tribology-in-2020-2021-2e00q3oy.pdf

A review of advances in tribology in 2020–2021

Scripta metallurgica et materialia

Research advances in residual thermal stress of ceramic/metal brazes

Microstructural, wear and corrosion characteristics of boronized AISI 904L superaustenitic stainless steel

The thermal fatigue behavior of chromium vanadium carbide (Cr − V − C) coatings and the wear of the coatings after thermal fatigue cycling was studied. The Cr − V − C coatings were grown on the surface of a ductile iron using thermo-reactive diffusion (TRD) and subjected to thermal fatigue in the temperature range of 25 to 750 °C for up to 500 cycles. Characterizations were made using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, microhardness measurements and wear tests. The Cr − V − C coated samples displayed superior thermal fatigue and wear resistance compared to the untreated ductile iron, mainly due to the dissolution of graphite nodules in the vicinity of the surface during TRD. The dissolution of graphite reduced the possibility of failure initiating from graphite nodules and graphite-matrix interfaces. Increasing the number of cycles resulted in increased flaking and decreased wear resistance in both the Cr − V − C coatings as well as the untreated ductile iron. Although much of the Cr − V − C coating was lost (due to flaking) after thermal cycling, the absence of graphite near the surface still provided improved resistance to wear in the TRD-treated samples. The results of this study indicate that TRD coatings hold great promise for use in the industrial applications.

Effect of thermal degradation on the properties and wear behavior of Cr−V−C composite coatings grown on ductile iron

Abstract Wear behaviour of special brass produced through two different methods (centrifugal and sand casting) was investigated. The wear tests were carried out at sliding velocities of 0.2 ms–1, 0.3 ms–1, 0.4 ms–1 and 0.5 ms–1 and under 10 N, 20 N, and 40 N variable loads. The sliding distance was 600 m for all the tests. A pin-on-disc device with round specimen inserts was used to conduct friction and wear tests in which the friction coefficient, the contact temperature and the linear wear of the tribo-pairs were continuously recorded against sliding distance. Two different materials were used as the counterparts, namely ferritic ductile iron equivalent to GGG40 and pearlitic ductile iron equivalent to GGG60. The microstructures and wear scars of the brass specimens were examined by optical, scanning electron microscopy (SEM) and X-ray microanalyses by EDAX. A correlation between hardness and wear volume rate was established for the investigated centrifugally cast and sand cast brass specimens. The volume rate of specimens produced by sand casting method was generally found to be higher than those of centrifugally cast specimens. Ferritic ductile counterpart led to higher wear volume rate than pearlitic ductile counterpart for the both specimens. Severe abrasive wear scars were observed for the sand cast specimens/ferritic ductile iron pair. However, severe adhesive wear took place for the centrifugally cast specimen/pearlitic ductile iron pair.

Pin-On-Disc Characterization of Brass/Ferritic and Pearlitic Ductile Iron Rubbing Pair

In this study, ferritic and pearlitic ductile irons were joined using a diffusion welding method at different temperatures for different durations. In order to determine the strength of the joints, shear and hardness tests were applied. Additionally, an optical microscopy examination was carried out in order to determine the interface properties of the joint. The work conducted showed that the highest interface strength was obtained for the specimens joined at 1000 °C for 60 min. The hardness measurements indicated that the highest hardness value was obtained for the interface and the hardness values on both sides of the interface decreased gradually.

http://journals.sagepub.com/doi/pdf/10.1177/2041297510394080

Diffusion welding/bonding of ferritic to pearlitic ductile irons

In this paper, the effect of manganese (wt%) and size of the Al2O3 abrasive grains of abrasive wear behaviours of Al–Si–(0.16–0.76%) Mn alloy was examined. Abrasive wear experiments were conducted ...

Abrasive wear behaviour of cast Al–Si–Mn alloys

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