Laser surface melting of γ-TiAl alloy: an experimental and numerical modeling study

被引：14

作者：

Balichakra, Mallikarjuna ^{[1
]}

Bontha, Srikanth ^{[1
]}

Krishna, Prasad ^{[1
]}

Balla, Vamsi Krishna ^{[2
]}

机构：

[1] Natl Inst Technol Karnataka, Dept Mech Engn, Surathkal 575025, Mangaluru, India

[2] Cent Glass & Ceram Res Inst, Bioceram & Coatings Div, CSIR, 196 Raja SC Mullick Rd, Kolkata 700032, India

来源：

MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 04期

关键词：

gamma-TiAl Alloys; laser surface melting (LSM); melt pool dimensions; residual stress; thermomechanical finite element analysis; MICROSTRUCTURE; FABRICATION; CORROSION;

D O I：

10.1088/2053-1591/aafc89

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The objective of present work is to study the evolution of thermal stresses during laser surface melting (LSM) of gamma-TiAl alloy using experimental and numerical modeling approaches. LSM of gamma-TiAl alloy samples were carried out at different processing conditions in a controlled atmosphere. Material characterization of the melted region was investigated using scanning electron microscope. It was found that fully lamellar microstructure was transformed into predominantly gamma-TiAl with little amount of alpha(2)-Ti3Al. A maximum improvement in hardness of over 72% was noticed in the melted region compared to that of the substrate. Three-dimensional thermomechanical finite element analysis of LSM of gamma-TiAl alloy was carried out. Melt pool dimensions, temperature history, and residual stresses were predicted from the finite element models. Measured and predicted values of melt pool depth were in good agreement with a maximum error of 13.6% at P = 400 W and V = 10 mm s(-1). Predicted residual stress in the melted region exceeded the yield strength of gamma-TiAl alloy and resulted in cracking of the melted region at all process conditions.

引用

页数：9

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