scholarly journals Influence of friction stir processing on the room temperature fatigue cracking mechanisms of A356 aluminum alloy

2018 ◽  
Vol 716 ◽  
pp. 165-178 ◽  
Author(s):  
Phalgun Nelaturu ◽  
Saumyadeep Jana ◽  
Rajiv S. Mishra ◽  
Glenn Grant ◽  
Blair E. Carlson
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Processing ◽  
Room Temperature ◽  
Fatigue Cracking ◽  
A356 Aluminum Alloy ◽  
Friction Stir ◽  
Cracking Mechanisms ◽  
A356 Aluminum

A New Wheel Design for Reducing Weight

2014 ◽  
Vol 794-796 ◽  
pp. 578-583 ◽  
Author(s):  
Frédéric Perrier ◽  
Véronique Bouvier ◽  
Lionel Duperray
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Automotive Industry ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
A356 Aluminum Alloy ◽  
Friction Stir ◽  
Forging Process ◽  
A356 Aluminum ◽  
Design Freedom

Reducing weight is one of the most important challenges in the automotive industry. A wheel design which enables to reduce weight from 13.5 kg to 10 kg is presented. This achievement is possible thanks to the use of a wide variety of technical processes. The disc is manufactured by CobapressTM, a casting/forging process which combines the advantages of a high design freedom, good mechanical properties and the absence of porosities. The alloy used is an A356 aluminum alloy modified with strontium. The rim is made of an AA6082 aluminum alloy which is extruded and flow-formed with a thickness from 3.3 down to 2.2 mm. Finally, the FSW (Friction Stir Welding) allows us to weld the two parts with a cavity to minimize the weight. With this technique the welding of the two different alloys is possible with good mechanical properties, the fracture happens outside of the weld during tensile tests. The final wheels passed bending and radial fatigue tests as well as radial impact tests with success.

Fatigue crack paths and properties in A356-T6 aluminum alloy microstructurally modified by friction stir processing under different conditions

2015 ◽  
Author(s):  
A. Tajiri ◽  
Y. Uematsu ◽  
T. Kakiuchi ◽  
Y. Suzuki
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Friction Stir Processing ◽  
Casting Defects ◽  
Processing Conditions ◽  
Tool Rotational Speed ◽  
Crack Initiation And Propagation ◽  
Friction Stir ◽  
Initiation And Propagation

A356-T6 cast aluminum alloy is a light weight structural material, but fatigue crack initiates and propagates from a casting defect leading to final fracture. Thus it is important to eliminate casting defects. In this study, friction stir processing (FSP) was applied to A356-T6, in which rotating tool with probe and shoulder was plunged into the material and travels along the longitudinal direction to induce severe plastic deformation, resulting in the modification of microstructure. Two different processing conditions with low and high tool rotational speeds were tried and subsequently fully reversed fatigue tests were performed to investigate the effect of processing conditions on the crack initiation and propagation behavior. The fatigue strengths were successfully improved by both conditions due to the elimination of casting defects. But the lower tool rotational speed could further improve fatigue strength than the higher speed. EBSD analyses revealed that the higher tool rotational speed resulted in the severer texture having detrimental effects on fatigue crack initiation and propagation resistances.

Sign in / Sign up

Export Citation Format

Share Document