Book ChapterDOI
Evaluation of the Mechanical Properties of 15Cr-5Ni Stainless Steel Produced by Direct Metal Laser Sintering
Davoud M. Jafarlou,Victor K. Champagne,Ian R. Grosse +2 more
- pp 75-84
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TLDR
In this article, the authors examined the mechanical behavior of 15Cr-5Ni stainless steel parts produced by direct metal laser sintering (DMLS) and identified the influence of low-temperature precipitation hardening on tensile properties and fracture toughness of DMLS fabricated specimens.Abstract:
This research work examines the mechanical behavior of 15Cr-5Ni stainless steel parts produced by direct metal laser sintering (DMLS). The main objective of this research is to identify the influence of low-temperature precipitation hardening on tensile properties and fracture toughness of DMLS fabricated specimens. Test specimens were fabricated according to ASTM E8/M8 and ASTM E399 standards using EOS M290 laser sintering machine. Following DMLS specimens were subjected to precipitation hardening for an hour at a temperature of 486 °C. To evaluate the influence of heat treatment on mechanical properties of the DMLS produced parts, tension tests and linear-elastic plane-strain fracture toughness tests were performed at the room temperature. Furthermore, microscopic observation of fractured surface was performed to study the failure mechanisms in more detail. The outcomes indicated that the post-DMLS heat treatment improves mechanical properties in the terms of yield stress, Young’s modulus, and ultimate tensile strength. However, this process has a negligible negative effect on the ductility. Moreover, the fracture toughness test results indicated ductile fracture mechanism in the DMLS produced specimens while the specimens were subjected to precipitation hardening demonstrates brittle fracture.read more
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Journal ArticleDOI
Effects of building direction and heat treatment on the local mechanical properties of direct metal laser sintered 15-5 PH stainless steel
TL;DR: In this article, the microstructural evolution and local mechanical properties of direct melting laser sintered (DMLS) 15-5 PH stainless steel were investigated as a function of the building direction and the heat treatment conditions.
Journal ArticleDOI
Structural integrity of additively manufactured stainless steel with cold sprayed barrier coating under combined cyclic loading
Davoud M. Jafarlou,Gehn Ferguson,Kyle Tsaknopoulos,Andrew Chihpin Chuang,Aaron T. Nardi,Danielle L. Cote,Victor K. Champagne,Ian R. Grosse +7 more
TL;DR: In this paper, the effect of metal additive manufacturing (AM) and cold spray (CS) technologies on fatigue performance of a 15Cr-5Ni precipitation-hardening stainless steel (15-5 PH SS) substrate additively manufactured by direct metal laser sintering with a layer of chromium carbide nickel (CrC-Ni) barrier coating deposited by CS.
References
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Journal ArticleDOI
Metal Additive Manufacturing: A Review
TL;DR: The state-of-the-art of additive manufacturing (AM) can be classified into three categories: direct digital manufacturing, free-form fabrication, or 3D printing as discussed by the authors.
Journal ArticleDOI
Recent developments in stainless steels
Abstract: This article presents an overview of the developments in stainless steels made since the 1990s. Some of the new applications that involve the use of stainless steel are also introduced. A brief introduction to the various classes of stainless steels, their precipitate phases and the status quo of their production around the globe is given first. The advances in a variety of subject areas that have been made recently will then be presented. These recent advances include (1) new findings on the various precipitate phases (the new J phase, new orientation relationships, new phase diagram for the Fe–Cr system, etc.); (2) new suggestions for the prevention/mitigation of the different problems and new methods for their detection/measurement and (3) new techniques for surface/bulk property enhancement (such as laser shot peening, grain boundary engineering and grain refinement). Recent developments in topics like phase prediction, stacking fault energy, superplasticity, metadynamic recrystallisation and the calculation of mechanical properties are introduced, too. In the end of this article, several new applications that involve the use of stainless steels are presented. Some of these are the use of austenitic stainless steels for signature authentication (magnetic recording), the utilisation of the cryogenic magnetic transition of the sigma phase for hot spot detection (the Sigmaplugs), the new Pt-enhanced radiopaque stainless steel (PERSS) coronary stents and stainless steel stents that may be used for magnetic drug targeting. Besides recent developments in conventional stainless steels, those in the high-nitrogen, low-Ni (or Ni-free) varieties are also introduced. These recent developments include new methods for attaining very high nitrogen contents, new guidelines for alloy design, the merits/demerits associated with high nitrogen contents, etc.
Journal ArticleDOI
Residual stresses in selective laser sintering and selective laser melting
Peter Mercelis,Jean-Pierre Kruth +1 more
TL;DR: In this paper, a simple theoretical model is developed to predict residual stress distributions in selective laser sintering (SLS) and selective laser melting (SLM), aiming at a better understanding of this phenomenon.
Journal ArticleDOI
Binding Mechanisms in Selective Laser Sintering and Selective Laser Melting
TL;DR: In this paper, a classification of SLS/SLM processes was developed, based on the binding mechanism occurring in the process, in contrast with traditional classifications based on processed material or the application.
Journal ArticleDOI
Anisotropic tensile behavior of Ti-6Al-4V components fabricated with directed energy deposition additive manufacturing
TL;DR: In this article, the authors investigated the anisotropic mechanical properties of a Ti-6Al-4V three-dimensional cruciform component fabricated using a directed energy deposition additive manufacturing (AM) process.