Larson Miller Parameter for the Prediction of the Creep Life of Unweld and Welded P91 Steel

For structural components that operate at elevated temperatures, martensitic P91 steel is preferable. It widely used in steam generators the fossil-fired thermal and nuclear power generation sectors due to its creep endurance corrosion resistance. Several laws, such as Monkman-Grant, Theta project, Wilshire Sinh model, Omega technique, Larson Miller Parameter (LMP), have been developed over time predict failure of materials susceptible phenomenon. However, only Law Larson-Miller are two methods approved API 579-1. In this work, test for welded unwelded P91were conducted temperatures 600°C under stresses 165, 175 MPa, 190 MPa. comparison specimens, specimens displayed a continuously more substantial development strain with time, resulting higher steady-state rate shorter rupture life. The increased magnitude creep-rupture data has observed impact dependability Because significant changes service temperature stress conditions, deteriorated, well an increase life predicted using LMP method, which utilizes constant C parameter. At same stress, weld material shows value than parent material, consistent experimental result.