首页|Influence of a fine-grained surface structure on the tensile behaviour of a beta stabilised intermetallic gamma-TiAl-based alloy

Influence of a fine-grained surface structure on the tensile behaviour of a beta stabilised intermetallic gamma-TiAl-based alloy

扫码查看
原文链接
  • NSTL
  • Elsevier
Intermetallic TiAl-based alloys show a high susceptibility to the consistency of their surface region expressed by, e.g., a tendency to environmental embrittlement. In the present work, the prospects of near surface grain refinement of the beta-stabilised TNM alloy and the first results of mechanical tests are presented and discussed. Grain refinement was done by remelting the surface region by a laser-based process. Adjusted parameters result in a refined surface area to a depth of approx. 225 mu m and at the same time a smooth surface. Subsequent heat treatment at 900 degrees C for 6 h leads to a fine-grained duplex microstructure in the remelted area, with an average grain size of about 500 nm compared to 7.3 mu m of the initial state. In the heat-affected zone below the remelted region, lamellar grains disappear by dissolving gamma-lamellae during remelting. These lamellae are re-formed during heat treatment, but their spacing is significantly refined. Tensile tests reveal an increase of the tensile strength of remelted and heat-treated specimens by about 16% if compared to those with the initial microstructure. Failure in the remelted and heat-treated tensile specimens originates from the refined lamellar grains of the heat-affected zone.

AluminidesMechanical propertiesFunctionally graded structureLaser processing and claddingMicrostructureAero-engine componentsMECHANICAL-PROPERTIESTITANIUM ALUMINIDESTAINLESS-STEELENVIRONMENTAL EMBRITTLEMENTTEMPERATURE EXPOSUREPHASECASTTI-48AL-2CR-2NBREFINEMENTPLASTICITY

Stangl, Christoph、Kollmannsberger, Eva、Zimogliadova, Tatiana A.、Krueger, Manja、Saage, Holger

展开 >

Univ Appl Sci Landshut

Novosibirsk State Tech Univ

Otto von Guericke Univ

2022

10.1016/j.intermet.2022.107566

Intermetallics

Intermetallics

EISCI
ISSN：0966-9795
年,卷(期)：2022.146
  • 3
  • 58