It is desired to produce an iron-carbon alloy that has It is desired to produce an iron-carbon alloy that has a minimum hardness of 175 HB and a minimum ductility of 52%RA. Is such an alloy possible? If so, what will be its composition and microstructure (coarse and fine pearlites and spheroidite are alternatives)? If […]
Railroad tracks made of 1025 steel are to be laid Railroad tracks made of 1025 steel are to be laid during the time of year when the temperature averages 10째C (50째F). If a joint space of 4.6 mm (0.180 in.) is allowed between the standard 11.9-m (39-ft) long rails, what is the hottest possible temperature […]
It is desired to produce an aligned carbon fiber-epoxy matrix It is desired to produce an aligned carbon fiber-epoxy matrix composite having a longitudinal tensile strength of 750MPa (109,000psi). Calculate the volume fraction of fibers necessary if (1) the average fiber diameter and length are 1.2 ( 10-2 mm (4.7 ( 10-4 in.) and 1 […]
Rank the following iron–carbon alloys and associated microstruct Rank the following iron窶田arbon alloys and associated microstructures from the highest to the lowest tensile strength: (a) 0.25 wt%C with spheroidite, (b) 0.25 wt%C with coarse pearlite, (c) 0.60 wt%C with fine pearlite, and (d) 0.60 wt%C with coarse pearlite. Justify this ranking.
On the basis of the curves in Figure, sketch schematic On the basis of the curves in Figure, sketch schematic strainâtime plots for the following polystyrene materials at the specified temperatures: (a) Amorphous at 120(C (b) Crosslinked at 150(C (c) Crystalline at 230(C (d) Crosslinked at50(C
Consider a symmetric and Consider a symmetric and bell-shaped distribution with a mean of 750 and a standard deviation of 50. There are 500 observations in the data set. 1- what percentage of the observations are less than 700? 2- Approximately how many observations are less than 700?
Problem 18.47 noted that FeO (wustite) may behave as a Problem 18.47 noted that FeO (wustite) may behave as a semiconductor by virtue of the transformation of Fe2+ to Fe3+ and the creation of Fe2+ vacancies; the maintenance of electro neutrality requires that for every two Fe3+ ions, one vacancy is formed. The existence of […]
a. If Fama Company, with a break-even point at $307,400 of sales, has actual sales a. If Fama Company, with a break-even point at $307,400 of sales, has actual sales of $530,000, what is the margin of safety expressed (1) in dollars and (2) as a percentage of sales? Round the percentage to the nearest […]
For each of edge, screw, and mixed dislocations, cite the For each of edge, screw, and mixed dislocations, cite the relationship between the direction of the applied shear stress and the direction of dislocation line motion.
For an FCC single crystal, would you expect the surface For an FCC single crystal, would you expect the surface energy for a (100) plane to be greater or less than that for a (111) plane? Why?