Abstract
The present study involves evaluation of fracture toughness and Charpy impact toughness of Inconel 625 structures fabricated by laser based additive manufacturing. The results of crack tip opening displacement (CTOD) fracture toughness are close to those reported for the Inconel 625 weld metal. The nature of the load–time traces of instrumented Charpy impact tests revealed that the alloy Inconel 625 in laser fabricated condition was associated with fully ductile behavior with Charpy V-Notch impact energy in the range of 48–54J. Stress relieving heat treatment at 950°C for 1h has resulted in marginal improvement in the impact toughness by about 10%, whereas no clear evidence of such improvement is seen in the CTOD fracture toughness. Fractographic examination of the Charpy specimens and the results of the instrumented impact tests imply that the mechanism of crack growth was propagation controlled under dynamic loading conditions. Dynamic fracture parameters were estimated from the instrumented impact test data and compared with the experimentally evaluated fracture toughness results.
Highlights
With increasing competition due to global economy, manufacturers face challenge to deliver products with new design and maximum possible features in a short time frame, to meet increasing market demands
Pre-cracked Charpy specimens are recommended for evaluation of dynamic fracture toughness parameters, an attempt is made to estimate fracture toughness parameters from un-precracked standard Charpy specimens
Present study has demonstrated that laser rapid manufactured structures of Inconel-625 are associated with fairly good fracture toughness
Summary
With increasing competition due to global economy, manufacturers face challenge to deliver products with new design and maximum possible features in a short time frame, to meet increasing market demands. Due to its attractive attributes LRM forms an active area of research with different names at various laboratories around the world Related literature in this area is focused on process development, its viability for specific end applications, parameter standardization for controlling structural features and mechanical properties of resultant structures [2,3,4,5,6]. A recent study performed in authors’ laboratory has evaluated initiation fracture toughness (J0.2) and compared fatigue crack growth rate (FCGR) in laser rapid manufactured (LRMed) structure of IN-625 with that reported for its wrought counterpart [8]. In an extension to this work, present investigations aims to evaluate the critical Crack Tip Opening Displacement (CTOD) fracture toughness and to study fracture behavior of laser rapid manufactured structures of alloy IN-625 under dynamic loading condition using instrumented charpy impact tests
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