Affordable Access

Publisher Website

Metallurgical optimisation of PM superalloy N19

Authors
Publisher
EDP Sciences
Publication Date
Identifiers
DOI: 10.1051/matecconf/20141411007
Keywords
  • Posters: Precipitation

Abstract

Microstructures of the new PM superalloy N19 have been investigated for various heat treatments in order to reach the best compromise between static strength and cyclic resistance. One subsolvus and several supersolvus heat treatments were applied to produce fine (7 μm) and medium (25 μm) grain sizes, respectively. The alloy is shown to be quite sensitive to the cooling conditions after solutioning as the γ′ hardening precipitates, both secondary and tertiary, have a direct influence on mechanical properties. Two cooling conditions after solutioning produce a high crack propagation resistance at 650 °C with dwell time cycles, which is one of the basic requirements. The low cycle fatigue behaviour appears to be correlated to the grain size, which determines the origin of crack initiation (from ceramic inclusions or not). The other mechanical properties (tensile, creep) remain above target levels. Despite the medium size grain microstructure in the supersolvus condition, a high level of mechanical strength is observed in N19 at elevated temperature. It is understood that further improvement in properties can be achieved by developing coarse grain microstructures.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

PME 19

Jan 01, 1995

PM304 coating on a Ni-based superalloy by PM techn...

on Materials Science and Engineer... Jan 01, 2008

PM 2.5.

on Proceedings of the National Ac... May 28, 2013

Syntheses and characterization of the W(II) and W(...

on Inorganica Chimica Acta Jan 01, 2010
More articles like this..