Laser cladding of aluminum alloys with concurrent cryogenic quenching for improved microstructure and hardness
نویسندگان
چکیده
In this study, a method to deposit quench-sensitive age-hardening aluminum alloy clads is presented, which produces hardness similar the T6 temper without requirement of solution heat treatment. A high-powered diode laser scanned across workpiece surface and material feedstock delivered melted via off-axis powder injection. The cladding process immediately followed by quenching with liquid nitrogen, improves cooling rate increases response subsequent precipitation was demonstrated on 6061 6061-T6511 extruded bar substrates 12.7 mm thickness. Single-track single-layer were deposited at power 3746 W, scan speed 5 mm/s, feed 18 g/min. in-situ nitrogen improved clad 15.7% from 73.1 HV 84.6 heat-affected zone 19.3% 87.1 103.9 HV. Extending multi-track multi-layer further increased 89.3 HV, close 90 Transmission electron microscopy revealed precipitate density in quenched responsible for higher hardness.
منابع مشابه
Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding
High-entropy alloys (HEAs) are novel solid solution strengthening metallic materials, some of which show attractive mechanical properties. This paper aims to reveal the effect of adding small atomic boron on the interstitial solid solution strengthening ability in the laser cladded CoCrFeNiAlxCu0.7Si0.1By (x = 0.3, x = 2.3, and 0.3 ≤ y ≤ 0.6) HEA coatings. The results show that laser rapid soli...
متن کاملLaser cladding of copper base alloys onto Al Si7 Mg0.3
Certain copper alloys have proved to be suitable for laser cladding onto aluminium base. By using the blown powder technique with a 1.5 KW C02 laser, clads without cracks or porosity have been produced. The base material has the composition Al Si7 Mg0.3 and the clads are made from alloyed copper with varying contents of Ni, Fe, Si and Al. Aluminium dilution in the clad can be kept lower than 1 ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Surface & Coatings Technology
سال: 2022
ISSN: ['1879-3347', '0257-8972']
DOI: https://doi.org/10.1016/j.surfcoat.2022.128460