Multi-layer friction deposits in nickel-based superalloy Inconel 718 were investigated for their heat-affected zone liquation cracking resistance. The friction deposits, owing to their fine-grained microstructure with a large number of subgrain boundaries and fine, uniformly distributed carbide particles, were found to exhibit superior liquation cracking resistance to standard wrought-processed alloy 718. Based on these findings, a new technique involving friction deposition of the base plates prior to fusion welding was proposed for overcoming liquation cracking. © 2017, The Minerals, Metals & Materials Society and ASM International.

Ravi Sankar Kottada

Department of Metallurgical and Materials Engineering

Janaki Ram G D

G. M. Karthik

Carbides

Cracks

Deposits

Heat affected zone

Heat resistance

NICKEL DEPOSITS

tribology

Base plates

CARBIDE PARTICLES

Fine-grained microstructure

Fusion welding

HAZ LIQUATION CRACKINGS

LIQUATION CRACKING

Nickel- based superalloys

SUBGRAIN BOUNDARIES

Friction

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

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

Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

In the present work, a metal-metal composite consisting of aluminum-magnesium alloy AA5083 matrix and nanocrystalline CoCrFeNi high-entropy alloy reinforcement particles in 12 vol% was successfully friction deposited in multiple layers. The layer interfaces or the reinforcement/matrix interfaces showed no brittle intermetallic formation – thanks to the inert nature as well as the high strength and hardness of the high-entropy alloy reinforcement particles. The composite showed significantly higher tensile and compressive strengths as compared to standard wrought-processed alloy AA5083-H112 and offered a much better combination of strength and ductility when compared to conventional aluminum matrix composites reinforced with ceramic particles. The current study establishes friction deposition as a viable technique for additive manufacturing of novel high-performance composite materials. © 2016 Elsevier B.V.

Materials Science and Engineering A

Additive manufacturing of an aluminum matrix composite reinforced with nanocrystalline high-entropy alloy particles

This work offers a fresh perspective on buttering, a technique often considered for fusion welding of dissimilar metals. For the first time, buttering was attempted in solid state using friction deposition. Using this new “friction buttering” technique, fusion welding of two different dissimilar metal pairs (austenitic stainless steel/borated stainless steel and Al-Cu-Mg/Al-Zn-Mg-Cu) was successfully demonstrated. The results show that friction buttering can simplify a tough dissimilar welding problem into a routine fusion welding task. © 2017, The Minerals, Metals & Materials Society and ASM International.

Friction Buttering: A New Technique for Dissimilar Welding

Friction Freeform Fabrication is a new solid-state additive manufacturing process. The present investigation reports a detailed study on the prospects of this process for additive part fabrication in superalloy Inconel 718. Using a rotary friction welding machine and employing alloy 718 consumable rods in solution treated condition, cylindrical-shaped multi-layer friction deposits (10 mm diameter) were successfully produced. In the as-deposited condition, the deposits showed very fine grain size with no grain boundary δ phase. The deposits responded well to direct aging and showed satisfactory room-temperature tensile properties. However, their stress rupture performance was unsatisfactory because of their layered microstructure with very fine grain size and no grain boundary δ phase. The problem was overcome by heat treating the deposits first at 1353 K (1080 C) (for increasing the grain size) and then at 1223 K (950 C) (for precipitating the δ phase). Overall, the current study shows that Friction Freeform Fabrication is a very useful process for additive part fabrication in alloy 718. © 2013 The Minerals, Metals & Materials Society and ASM International.

Friction freeform fabrication of superalloy inconel 718: Prospects and problems

A new additive manufacturing process, termed "friction freeform fabrication," has been recently proposed by the authors. One of the unique capabilities of the process is that it can facilitate fabrication of three-dimensional parts in materials that are difficult to fusion deposit. The current study is a striking demonstration of this, in which cylindrical samples of 40 mm height and 10 mm diameter were successfully produced in borated stainless steel ASTM 304B4, a material known to be very difficult to fusion weld or deposit. Microstructures and mechanical properties of these samples were investigated in detail and were compared to those of standard wrought-processed alloy 304B4 Grade B material. © 2013 ASM International.

Journal of Materials Engineering and Performance

Microstructures and properties of friction freeform fabricated borated stainless steel

Friction surfacing involves complex thermo-mechanical phenomena. In this study, the nature of dynamic recrystallization in friction surfaced austenitic stainless steel AISI 316L coatings was investigated using electron backscattered diffraction and transmission electron microscopy. The results show that the alloy 316L undergoes discontinuous dynamic recrystallization under conditions of moderate Zener-Hollomon parameter during friction surfacing. © 2012 Elsevier Inc. All rights reserved.

Materials Characterization

Dynamic recrystallization in friction surfaced austenitic stainless steel coatings

Use of Friction Buttering for Overcoming HAZ Liquation Cracking

Journal	Data powered by TypesetMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Publisher	Data powered by TypesetSpringer Boston
ISSN	10735615
Open Access	No