Question

If Larson-miller parameter for a given elevated temperature alloy was found to be 26000, by how much would the rupture life of a sample be estimated to decrease if absolute temperature of a test were increased from 1100 to 1250 K? assume that Larson-miller constant is equal to 20

Answer 1

Given:

Larson Miller Parameter, LMP= 26000

Larson Miller Constant, C= 20

Temperatures

As per Larson-Miller relation,

; where T is in Kelvin and

t is in hours

For ,

For,  

Decrease in rupture life due to rise of teperature =