Influence of Laser Power on the Hardening of Ti6Al4V Low-Pressure Steam Turbine Blade Material for Enhancing Water Droplet Erosion Resistance

Abstract

To overcome water droplet erosion of Ti6Al4V alloy blade material used in low-pressure steam turbine (LPST) of high-rating nuclear and super critical thermal power plants, high-power diode laser (HPDL) surface treatment at two temperatures corresponding to two different power levels was carried out. During incubation as well as under prolonged erosion testing, the HPDL surface treatment of this alloy has enhanced its resistance significantly. This is due to the formation of fine-grained martensitic ( a) phase due to rapid heating and cooling associated with laser treatment. The droplet erosion test results after HPDL surface treatment on this alloy, SEM, XRD analysis, and residual stresses developed due to HPDL surface treatment are given in this paper.

Numerical experiment of the solid particle erosion of bionic configuration blade of centrifugal fan

“…A face (12) where C(d p ) is a function of particle diameter, α is the impact angle of the particle path with the wall face, f(α) is a function of impact angle, v is the relative particle velocity, b(v) is a function of relative particle velocity, and A face is the area of the cell face at the wall. In Eq.…”

“…It has been concluded by previous researcher [9][10][11][12][13] that enhancing the wear resistance of the material surface using resistant materials or coating material with better wear resistance is the general methods to reduce erosion. These methods will result in cost increasing.…”

Numerical Analysis of Erosion Caused by Biomimetic Axial Fan Blade

“…where ( ) is a function of particle diameter, is the impact angle of the particle path with the wall face, ( ) is a function of impact angle, ] is the relative particle velocity, (]) is a function of relative particle velocity, and face is the area of the cell face at the wall. In (12) the impact angle function was defined by a piece-linear profile and the diameter function and velocity exponent function are 1.8 − 09 and 2.6, respectively [18].…”

“…Inevitably, research on erosion is attracting more and more attention in the international academic circle [4][5][6][7][8]. It has been concluded by previous investigators that general methods used to reduce erosion are enhancing the wear resistance of material surface by means of wear resistant materials or coating material with better wear resistance [9][10][11][12][13].…”

Microstructure and wear resistance of one-step in-situ synthesized TiN/Al composite coatings on Ti6Al4V alloy by a laser nitriding process

“…This periodic stress would also lead to the fatigue failure of blades [3,4]. On the other hand, the turbine efficiency can be improved by maximizing the conversion from steam to energy through lengthening the final row of blades [5]. An increase in the last stage blade annulus area can be accomplished by using longer blades fabricated by relative light alloy.…”