Question

3. Explain four of the following: a) true tensile strength = true fracture strength b) the second stage of creep c) carbon diffuses faster in ferrite than austenite d) temperature-time curves for precipitation reactions and TTT curves are nose-shaped e) solution strengthening f) on TTT curves, the M(finish) temperature is much lower than the M(start) temperature g) corrosion readily occurs under the head of a bolt on a steel plate

Answer 1

creep is known as It is a which results a balance between the and b) Second stage of Creep : ~ . The second stage of Secondary Greep. period of nearly castant creep rate, from competing processes q strain hardening reconery secondary creep is usually referred creep. average value of creep during for this reason secon to as a The rate steady state secondary creep is called

on TTT carne, the Me (finish) semperature much lower than the Mlafast) temperature - On cool met a stable austente 1% cooling of martensite forms at about 230°c. The at about 230°C. The trasformation is athermal in nature i.e. amount of transformation h is time independent (characterstic amount of trang completes in a very short time) but fuction of temp alone.

creep is known as It is a which results a balance between the and b) Second stage of Creep : ~ . The second stage of Secondary Greep. period of nearly castant creep rate, from competing processes q strain hardening reconery secondary creep is usually referred creep. average value of creep during for this reason secon to as a The rate steady state secondary creep is called

creep is known as It is a which results a balance between the and b) Second stage of Creep : ~ . The second stage of Secondary Greep. period of nearly castant creep rate, from competing processes q strain hardening reconery secondary creep is usually referred creep. average value of creep during for this reason secon to as a The rate steady state secondary creep is called