Abstract: In this research, the oxidation behaviour of high Aluminum heat resistant steel (%25Cr,%20Ni,%8Al) hasbeen evaluated at the temperature range of (1000-1300ºC).The results showed that there was no countinous healinglayer on the surface of the alloy when Al increased up to %5.5 and the oxidation resistance of steel decreased due toformation of spinel oxides on the surface.By increasing ...

Abstract Al-Si wrought piston alloys can lack properties due to inefficient grain refining. A novel Al-Nb-B refiner was introduced some time ago, but has still not been assessed in industry for alloys. This paper describes the first trial of Al-Ni-B addition and its impact on full-scale manufacturing, structure, AA4032 products extruded with without billet homogenization. It is shown that Nb-B ...

This article extensively reviews published research on inclusions in ingot steel and defects on ingot products, methods to measure and detect inclusions in steel, the causes of exogenous inclusions, and the transport and entrapment of inclusions during fluid flow, segregation, and solidification of steel cast in ingot molds. Exogenous inclusions in ingots originate mainly from reoxidation of th...

Introduction Ingot products account for 8.3% of the total crude steel produced in the world. It is produced either by top pouring or bottom pouring of the liquid in the moulds. The increasing demand for quality steels led to the evolution of bottom pouring technology for casting of steel ingots. This process constitutes of a set up involving pouring sprue and runner system to deliver liquid ste...

The hot ductility of cast ATI® 718Plus® was assessed using the Gleeble thermo-mechanical simulator after being subjected to different homogenisation heat treatments. deteriorated significantly long-dwell treatments for 24 h at temperatures 1120 and 1190 °C as compared with those treated a short dwell time 4 same temperatures. observed deterioration related more extensive liquation along grain b...

Whole body heat production (HP) and heat loss (HL) were examined to determine if the free-running circadian rhythm in body temperature (Tb) results from coordinated changes in HP and HL rhythms in thermoneutrality (27°C) as well as mild cold (17°C). Squirrel monkey metabolism ( n = 6) was monitored by both indirect and direct calorimetry, with telemetered measurement of Tb and activity. Feeding...

Microstructure, mechanical properties and phase transformation of a heat-resistant rare-earth (RE) Mg-16.1Gd-3.5Nd-0.38Zn-0.26Zr-0.15Y (wt.%) alloy were investigated. The as-cast is composed equiaxed α-Mg matrix, net-shaped Mg5RE Zr-rich phases. According to aging hardening curves tensile variation, the optimized condition solution treatment at 520 °C for 8 h subsequent 204 12 was selected. con...

Purpose. It consists in establishing the influence of chemical composition on type, and morphology primary carbides nickel-based superalloy, which allows to increase operational properties parts through structure carbide component.
 Research methods. Process modeling was carried out using CALPHAD method. The initial data were compositions model alloys with different concentrations carbide-...