Why fine pearlite is harder and stronger than coarse

Assignment Help Civil Engineering

Reference no: EM13529981

1.(a) Briefly describe the microstructural difference betweenspheroidite and tempered martensite.

(b) Explain why tempere dmartensite is much harder and stronger.

2.Rank the following iron–carbon alloys and associated micro structures from the hardest to the softest: (a) 0.25 wt% Cwith coarse pearlite, (b) 0.80 wt% C with spheroidite, (c) 0.25 wt%C with spheroidite, and (d) 0.80 wt% C with fine pearlite. Justifythis ranking.

3.Briefly explain why fine pearlite is harder and stronger than coarse pearlite, which in turn is harder and stronger than spheroidite.

4.Briefly describe the simplestcontinuous cooling heat treatment procedure that would be used inconverting a 4340 steel from one microstructure to another.

(a) (Martensite + ferrite + bainite) to (martensite + ferrite +pearlite + bainite)

(b) (Martensite + ferrite + bainite) to spheroidite

5.Briefly describe the simplest heat treatment procedure thatwould be used in converting a 0.76 wt% C steel from onemicrostructure to the other, as follows:

(a) Martensite to spheroidite

(b) Spheroidite to martensite

(d) Pearlite to bainite

(e) Spheroidite to pearlite

Reference no: EM13529981

Questions Cloud

Determine the greatest weight of the machine that the beam : The beam has a flange width b=8 in. If the maximum bending stress is not to exceed σallow=22 ksi, determine thegreatest weight of the machine that the beam can support. The center of gravity for the machine is at G, and the supports at Band C are smo..

Determine the maximum allowable uniform load what : A W410 X 0.83 steel section is used in a10 m simple span. Determine the maximum allowable uniform load what the beam can carry if the allowable flexural stress is 165MPa, the allowable shear stress is 100 MPa, and the allowable deflection is 1/360 of..

Describe with the aid of diagrams explaining why and when : Describe with the aid of diagrams explaining why and when boundary layer separation occurs. c)Describe some methods to prevent boundary layer separation

Convert a stress of 4500 newtons per square millimeter : Convert a stress of 4500 Newtons per square millimeter to kipsper square foot. Use complete and utterly perfect unit analysismethods. Do one one calculation line.

Why fine pearlite is harder and stronger than coarse : Briefly describe the simplest heat treatment procedure thatwould be used in converting a 0.76 wt% C steel from onemicrostructure to the other, as follows:

How wouldyou accomplish this task : Suppose you arethe operations manager of a manufacturingconcern. You are directedto expand the capacity of your plant owing to increasing demand. How wouldyou accomplish this task?

Draw the er diagram above scenario by illustrating the : Consider the following requirements for an airline ticketsbooking system. The system is composed of manyairlines. Each airline is identified by a code, name and headquarter’s address. An airline has different mileprograms, identified by a type- code,..

The secondpicture is the exact same thing but horizontal : The system shown consists of a member which is built in to rigidfoundations at both ends. It is unstrained in the horizontalposition. But then it is put in an upright position, and hence issubject to gravity. Find the stress and strain as a function ..

Suppose the bar is built in at the bottom and a mass of : A vertical bar is known to have dimensions 100" by 1" by 4" priorto application of a load, to have elastic modulus equal to107 psi, and to have a Poisson's ratio equal to 0.3.Suppose the bar is built in at the bottom and a mass of unknownweight is mo..

User Account

All Pages