I) Answer True or False: (4 pts.) 1. ________ Martensite is harder than pearlite

ID: 1857542 • Letter: I

Question

I) Answer True or False: (4 pts.)

1. ________ Martensite is harder than pearlite.

2. ________ A phase in a two phase region in a certain alloy has different composition at different temperatures.

3. ________ Brasses are alloys of copper and nickel.

4. ________ In TTT diagrams the transformation of martensite to other phases is represented.

II) Circle the correct answer in each of the following: (6 pts.)

1. The approximate hardness of an annealed steel is: a) RB50 b) RB85

c) RB98 d) RB150.

2. ? -

IV)

1.The minimum chromium content in a stainless steel is 10-11 wt%

2.Pearlite is made up of lamellar(shape)iron alloy (phase)

The composition of pearlite isalpha-ferrite(88 wt%) andcementite(12 wt%)