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"Isothermal oxidation behavior of W-free Co–Ni–Al-based superalloy at h" by Qiuzhi Gao, Hang Shang et al.

Co-based superalloys with the advantages of high melting point, high-temperature mechanical properties, and large resistance under hot corrosion environment are potential candidates for turbine engine components. The isothermal oxidation behavior of Co–Ni–Al-based superalloy with the addition of Mo and Cr in dry air at 1073 and 1173 K was investigated. The results showed that similar three-layer oxides structures were composed of Co-containing oxides, complex oxides rich in Co and Al, and Al2O3 layer formed on both 2Mo and 2Cr Co–Ni–Al-based superalloys, and Mo-containing oxides also existed in the subsurface. The oxides in the outer layer transferred from Co3O4 to denser CoO with the increase in temperature. The γ'-free zone formed under the Al2O3 layer due to the depletion of Al. Co–Ni–Al-based superalloys need to conquer a large energy barrier at an earlier stage of oxidation and exhibit good oxidation resistance at 1073 K. ....

Ncr Co , Xidation Activation Energy , Xidation Behavior , Oxide Layers , W Free Co Ni Al Based Superalloy ,

"Development and evaluation of a novel geopolymer based on basalt rock " by Mohsin Nawaz, Ana Heitor et al.

Increase in industrial and construction activities has led to an enormous rise in waste generation and its hazardous impacts on the environment. Quarrying of rocks and manufacturing of artificial sands for civil engineering projects leads to the dumping of rock waste dust, which is a source of landfill problems. Further, excessive energy requirements for cement manufacturing, higher greenhouse gas emissions and rapid depletion of natural resources have focused the research towards the development of environment friendly and sustainable materials such as geopolymers. In this paper, a novel geopolymer has been developed from industrial wastes such as basalt rock fines considering partial replacement with ground granulated blast furnace slag up to 30%. After a detailed mix-design investigation, the optimum molarity (M) of the sodium hydroxide solution was found to be 8 M whereas the optimum ratio (R) of sodium silicate to sodium hydroxide solution as 0.75. Unconfined compressive strength ....

Basalt Rock Waste , Blast Furnace Slag , Nconfined Strength ,

"Experimental Investigation on Micro Deep Drawing of Stainless Steel Fo" by Jingwei Zhao, Tao Wang et al.

Abstract
In the present work, austenitic stainless steel (ASS) 304 foils with a thickness of 50 µm were first annealed at temperatures ranging from 700 to 1100 ℃ for 1 h to obtain different microstructural characteristics. Then the effects of microstructural characteristics on the formability of ASS 304 foils and the quality of drawn cups using micro deep drawing (MDD) were studied, and the mechanism involved was discussed. The results show that the as-received ASS 304 foil has a poor formability and cannot be used to form a cup using MDD. Serious wrinkling problem occurs on the drawn cup, and the height profile distribution on the mouth and the symmetry of the drawn cup is quite non-uniform when the annealing temperature is 700 ℃. At annealing temperatures of 900 and 950 ℃, the drawn cups are both characterized with very few wrinkles, and the distribution of height profile, symmetry and mouth thickness are uniform on the mouths of the drawn cups. The wrinkling becomes ....

Icro Deep Drawing , Tainless Steel Foils ,

"Effect of WC particle size on microstructure and diffusion at the inte" by Gang Li, Hongmei Zhang et al.

Abstract
Tungsten carbide/high strength steel (WC/HSS) composites were prepared by cold pressing and vacuum sintering. The microstructure and micro-hardness of the composites with different particle sizes were analyzed by optical microscopy (OM), scanning electron microscopy (SEM), ultra-high temperature laser confocal microscope and microhardness tester. The results show that WC density tended to increase as the average grain size of WC decreased. When the particle size of WC powder was 100 nm, the density reached 91.22%. The micro-hardness of WC increased with the decrease of WC particle size. When the particle size of WC powder was 100 nm and sintering temperature was 1 320 ℃, the micro-hardness of WC reached about 1680 HV . The micro-hardness of WC near the bonding interface was higher than that of other parts. The microhardness of HSS core varied little with WC particle size, which was about 500 HV . When the particle size of WC powder particles was 200 nm, a transition ....

Article Size ,

"Effect of ni on the microstructure and diffusion behavior at the inter" by Hongnan Li, Ling Yan et al.

Abstract
In this study, WC‐Ni/high‐speed steel composite materials for application as micro‐drills were prepared by cold pressing and high‐temperature vacuum sintering using a self‐designed mold in the laboratory. The effect of Ni on the microstructure and diffusion behavior at the interface of the WC/high‐speed steel composite was investigated. The results show that the addition of Ni pro-moted the diffusion of elements, and reduced defects such as micropores and microcracks at the WC/high‐speed steel composite interface. It also improved the bonding strength of the WC/high-speed steel composite interface, and significantly decreased the WC hardness. ....

Interface Diffusion Behavior , Shi Element , C High Speed Steel Composite ,