Vellore Margabandhu Radhakrishnan

Composition

Crack propagation

Creep

Crystal Structure

FRACTURE MECHANICS

Metal casting

Metal castings

Nickel alloys

Precipitation (chemical)

Scanning electron microscopy

Solidification

Carbon content

CAST NICKEL BASE SUPERALLOY

CAST TO SIZE SHEET

CREEP CRACK GROWTH RATES

MOLD WITHDRAWAL TECHNIQUE

TRANSGRANULAR CREEP CAVITATIONS

VACUUM INDUCTION FURNACE

superalloys

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It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Creep crack growth behavior at 1033K of directionally solidified CM 247 LC — a cast nickel-base superalloy

Scripta Materialia

Uniaxial creep deformation of a columnar-grained cast Ni-based superalloy has been analyzed in the temperature range of 1035-1315 K. Two-stage heat treatment of the material resulted in an average γ′ particle size of 0.4 μm and inter-particle distance of 0.04 μm. At 1035 K, the alloy showed predominantly primary creep with very low tertiary creep strains. At temperatures above 1035 K, a pseudo-tertiary creep regimen is predominant. Faceted fracture, coarsening of γ′ particles, decohesion of the matrix around the particles, and rafting of the coarsened γ′ particles have been observed as failure modes over the temperature range studied. An analysis is presented to understand creep deformation behavior of the material in the secondary and tertiary creep stages, by expressing them as power functions of time. Failure diagnostic diagrams have also been constructed for the material over the temperature range investigated.

Journal of Materials Engineering and Performance

Creep deformation behavior and failure diagnostic diagrams of a columnar-grained nickel-based superalloy

Creep-rupture properties of a columnar-grained nickel-base superalloy have been evaluated over a wide temperature range (1033 to 1311 K) and stress levels (80 to 850 MPa). Creep data analyses based on the conventional approach as well as on a new graphical method - the β-envelope method (Ref 1) - have been carried out for creep strain and life estimation purposes. The relation between minimum creep rate of the alloy with the applied stress obeys simple power law, whereas the rupture data of the alloy fits well to the Larson-Miller parameter. Also, the Monkman-Grant relation between the minimum creep rate and the rupture life produces a trend with some degree of scatter in the data. The latter relation in its generalized form by the β-envelope method exhibited the best correlation with significantly reduced scatter in the data.

Creep Data Analyses of a Columnar-Grained Nickel-Base Superalloy by Conventional and β-Envelope Methods

Lecture Notes in Computer Science

Foundations of Software Technology and Theoretical Computer Science

International Journal of Fatigue

A concept for preventing repeated weld repairs of bridge structuresWelsch, W.H. ASTM STP 1100 (American Society for Testing and Materials, 1990) 44–52

Fracture Mechanics

An Experimental Investigation of Creep Crack Growth in IN100

creep crack growth behavior at 1033K of directionally solidified CM 247 LC - A cast nickel-base superalloy

Journal	Data powered by TypesetScripta Materialia
Publisher	Data powered by TypesetElsevier Ltd
ISSN	13596462
Open Access	No