Question

1. (30 points) Using the chart given below, calculate the strength in psi and in MPa of a piece of Steel of hardness 65HRA. Assume the HB values given in the chart are at a load of 3000 Kg.

Hint: use the following equations to find the UTS: UTS in MPa = 3.5*HB
UTS in psi = 500*HB

1000O 10rDiamond Cubic boron nitride Boron carbide Titanium carbide Tungsten carbide Cementite Martensite 4000 9 Corundum 1400 8 -Topaz 1100 7Quartz 1000 E Hard chromium plate Fully hardened tool steel 1000 900 85 100 800 700 × 6 Orthoclase 700 700 120 110 100 250 Glass 75 70 400 40 5 Apatite Cold-drawn 0.5 C steel Cold-drawn 0.25 C steel 50F 400 150 100 75 40 4 Fluorite Titanium Gray iron Malleable iron Annealed mild steel 200 10 150 3Calcite 45 150 70 70-30 brass Nickel Pure iron 100 10040 100 2 Gypsum 40 70 Talc Bakelite 40 Zinc, gold, magnesium 30 F Silver Polystyrene Pure aluminum Vinyl resin Graphite 10 10 3

Answer 1