Mechanical properties of high temperature strength of metals, Mechanical Engineering

Assignment Help:

Q. Mechanical Properties of high temperature strength of metals?

The high temperature strength of metals is related to their melting points, but many other factors limit the practicality of using higher melting point metals.

Carbon steels in pressure retaining services are usually limited to a maximum operating temperature of 750°F (400°C) where its elastic properties predominate. Above this temperature, graphitization of the carbon and excessive oxidation may occur over time, resulting in significantly reduced mechanical strength.

For temperatures between 750° and 950°F (400°-510°C). Above 950°F (510°C), the addition of chromium to steel assists in the prevention of oxidation and scaling. The addition of molybdenum (Mo) is the most effective alloying element for increasing the creep strength of steel. Up to 1000°F (540°C), designs may be based on the material's short time high temperature properties.

For temperatures above 1000°F (540°C), creep becomes the controlling factor and must be considered in the design. Under these conditions or for somewhat more rigorous service, austenitic stainless steels and nickel alloys have much higher creep strength than carbon steel or other ferritic alloys.


Related Discussions:- Mechanical properties of high temperature strength of metals

Coagulation-flocculation-sedimentation, 2. Assume that the river has been s...

2. Assume that the river has been selected as the source of raw water for the 2.0mgd demand. a. Surface water has low alkalinity, high turbidity. The distribution system is cast

Determine the cutting ratio, Write the velocity relationship in orthogonal ...

Write the velocity relationship in orthogonal cutting. A bar of 75 mm dia. is reduced to 73 mm by a cutting tool while cutting orthogonally. If the mean length of cut chip is 73.5

Principal stress and strain, The end gear is subjected to the loading given...

The end gear is subjected to the loading given in the picture below. If the bearings A & B exerts only Z & Y component of forces on the shaft, Verify the equilibrium torque T at ge

Valves, What can a valve do?  It can prevent flow (on/off), allow variable ...

What can a valve do?  It can prevent flow (on/off), allow variable control of the flow and provide a safe working environment. What sort of questions should we be asking when selec

Calculate size of blank required for drawing, Calculate Size of Blank Requi...

Calculate Size of Blank Required for Drawing A flanged cup shown in Figure is to be produced by deep drawing. Calculate the size of the blank required for drawing.

What will happen if air filter is not used?, (a) What will happen if air fi...

(a) What will happen if air filter is not used? (b) What are the components of an air filter? (c) What precautions should be followed while cleaning the air filter? (d) What grade

What is subsetting, What is Subsetting Subsetting : Vendors selected an...

What is Subsetting Subsetting : Vendors selected and implemented only portions of the whole of IGES, thus making exchange between two systems impossible without  prior agreemen

Swot Analysis, what are the threats of mechanical engineering ?

what are the threats of mechanical engineering ?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd