Materials Issues For Users Of Gas Turbines.

  title={Materials Issues For Users Of Gas Turbines.},
  author={Henry L. Bernstein},
Material issues are of paramount importance for the reliable and cost effective operation of gas turbine engines. Because of the high turbine temperatures, the materials degrade over time, which requires their repair or replacement. Rapid degradation or the inability to repair these complex materials results in excessively high operating costs. This paper concentrates upon the hot section components, because this is where the majority of turbine distress occurs. Superalloys, both nickel base… 

Advanced Materials used for different components of Gas Turbine

This paper presents a critical review of the existing literature of gas turbine materials and each plays an important role within the Gas Turbine Material literature and ultimately influences on planning and development practices.

Degradation of Gas Turbine Blades for a Thermal Power Plant

There are three stages of gas turbine blade in hot gas path (turbine section) of power generation gas turbine. Occurrences of wear and crack were observed on gas turbine blades in this section. The

Microstructural Changes during High Temperature Service of a Cobalt-Based Superalloy First Stage Nozzle

Superalloys are a group of alloys based on nickel, iron, or cobalt, which are used to operate at high temperatures ( > 540°C) and in situations involving very high stresses like in gas turbines,

Wear characteristics of commercial gas turbine components

Wear is one of the common degradations in a commercial gas turbine. A stainless steel grade 304 (SS 304) fuel nozzle and its collar made of nickel-based superalloy (Hastelloy X) are two vital

Analysis Of Hot Section Failures On Gas Turbines In Process Plant Service.

In-service failures of process plant gas turbines can have major economic consequences in terms of repairs and downtime. Following such an incident, steps need to be taken to avoid a recurrence. This

On the Role of Microstructural Characterization in Damage Analysis of Turbine Blade Superalloys

  • H. M. Tawancy
  • Materials Science
    Metallography, Microstructure, and Analysis
  • 2016
We emphasize the importance of detailed microstructural characterization in damage analysis of turbine blade superalloys. Examples representing a variety of damage modes sustained during engine

Erosion behavior of Ni-based coating under high-speed hot airflow

ABSTRACT The erosion behaviour of a nickel-based alloy coating under high-speed hot airflow erosion caused by propellant combustion was studied. The coating was prepared on the PCrNi3MoVA steel



Analysis of Cracked Gas Turbine Blades

Results from an analysis of cracked first stage blades (or buckets) from two General Electric Frame 7001 E industrial/electric utility gas turbines are presented. Numerous cracks were observed along

Analysis of General Electric Model 7001 First-Stage Nozzle Cracking

Analyses of first-stage nozzle cracking in General Electric Model 7001B and 7001E industrial gas turbines are presented. Empirical algorithms are developed to predict the maximum extent of cracking

Coating Life Prediction for Combustion Turbine Blades

A life prediction method for combustion turbine blade coatings has been developed by modeling coating degradation mechanisms including oxidation, spallation, and aluminum loss due to inward

Experience with platinum aluminide coatings in land-based gas turbines

AbstractHot-corrosion crucible tests with salt mixtures which simulated actual blade deposits were carried out to evaluate the potential of platinum-modified aluminide coatings for application in

TBCs for better engine efficiency

State-of-the-art thermal barrier coatings (TBCs) developed for aircraft engines can achieve both hot-section component operating temperature reductions and superior oxidation resistance. Such TBCs

Experience with MCrAl and thermal barrier coatings produced via inert gas shrouded plasma deposition

Plasma spray deposition of MCrAlY coatings for corrosion resistance and rub tolerance on gas turbine blades, vanes and seal surfaces has received a great deal of attention in recent years. While most

Current status and future trends in turbine application of thermal barrier coatings

This paper provides an overview of the current status and of future trends in the application of thermal barrier coatings (TBC) to turbine components, and in particular to high turbine airfoils.

A Fracture Mechanics Approach to Turbine Airfoil Design

An analytical study was conducted using fracture mechanics principles to model turbine airfoil cracking. It was found that crack initiation can be related to calculated residual strains in the

Effect of sulfur removal on Al2O3 scale adhesion

If the role of reactive element dopants in producing A12O3 scale adhesion on NiCrAl alloys is to getter sulfur and prevent interfacial segregation, then eliminating sulfur from undoped alloys should

Assessment of service induced microstructural damage and its rejuvenation in turbine blades

AbstractCorrelations between service induced microstructural degradation and creep properties in investment cast IN738LC turbine blades are discussed. Microstructural degradation in the form of γ’