Cast stainless steel CF8C-Plus (19wt%Cr/12%Ni) has excellent creep properties, but limited oxidation resistance above 700°C in environments containing H2O. One strategy to improve the alloy oxidation performance is to increase the Cr and Ni concentration. Two new alloys, with, respectively, 21wt%Cr–15wt%Ni and 22wt%Cr–17.5wt%Ni were therefore developed and their long-term oxidation behaviors in...

the fabrication of complex-shaped parts out of (wt %) co-28cr-6mo alloy by three-dimensional printing (3dp) was studied using two grades of the alloy with average particle sizes of 20 and 75 μm. to produce sound specimens, 3dp processing parameters were tuned. the sintering behavior of the powders was characterized by the dilatometric analysis. batch sintering in argon atmosphere at 1280 °c for...

Spring applications require materials that possess a low Young’s modulus and high strength, in addition to having a lower alloying percentage for reduced costs. In this study, a new low-cost ¢-type titanium alloy with a lower alloying percentage than conventional ¢-type alloys was developed for spring applications using [Al]eq and [Mo]eq. The alloy is located in the near-¢ region and its ¢ tran...

Endoscopic surgery has recently been adopted in various surgical operations. Forceps stuck through trocars into the abdominal or chest cavity, dissects and grasps internal organs. Due to their xed shapes, the current forceps limit the skill of surgeons. We have worked on the development of active forceps adoping shape-memory-alloy pipes and coaxicially assembling them. In this paper, we show se...

Al2O3 ceramics were successfully brazed under high vacuum conditions using the active Ni50Ti50 master alloy at 1320 °C with different holding time. The interfacial microstructure of joint was characterized SEM, EDS and TEM. effects time on evolution mechanical properties joints investigated. results revealed that typical structure Al2O3/Ni–Ti for 45 min Al2O3/AlNi2Ti + Ni2Ti4O/Ni2Ti4O/TiNi. Ni2...

the development, survival, and reproduction of diamondback moth (dbm), plutella xylostella (l.), were studied in laboratory at 25±1°c, 65±5% rh and a 14l: 10d hours photoperiodism on five host plants of: cauliflower (brassica oleracea l. var. botrytis), two varieties of cabbage (b. oleracea l. var. capitata) namely ‘globe master’ and ‘scarlet ohara’, kohlrabi (b. oleracea l. var. gongylodes), a...

alloy 718 (IN 718) were characterized to identify processing-microstructure-property relationships. The alloy was sequentially cold rolled (CR) to 0, 10, 20, 30, 40, 60, and 80 pct followed by annealing at temperatures between 954 °C and 1050 °C and the traditional aging schedule used for this alloy. In addition, this alloy can be superplastically formed (IN 718SPF) to a significantly finer gra...

We estimate in this paper the errors in the zenith angle distribution for the charged current events of the solar neutrinos caused by the uncertainty of the earth electron density. In the model of PREM with a 5% uncertainty in the earth electron density we numerically calculate the corrections to the correlation between [N ]5/[N ]2 and [N ]2/[N ]3, and find the errors notable. Forthcoming resul...

Precipitation behavior and the quenching sensitivity of a spray deposited Al-Zn-Mg-Cu-Zr alloy during isothermal heat treatment have been studied systematically. Results demonstrate that both the hardness and the ultimate tensile strength of the studied alloy decreased with the isothermal treatment time at certain temperatures. More notably, the hardness decreases rapidly after the isothermal h...

Carbon-supported platinum (Pt) and palladium (Pd) alloy catalyst has become a promising alternative electrocatalyst for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. In this work, the synthesis of highly active and stable carbon-supported Pt-Pd alloy catalysts is reported with a room-temperature electron reduction method. The alloy nanoparticles thus prepared show a pa...