Residual stresses and microstructure of H13 steel formed by combining two different direct fabrication methods

Maziasz, P.J.; Payzant, E. Andrew; Schlienger, M.E.; McHugh, K. M.

doi:10.1016/s1359-6462(98)00349-2

Cited by 28 publications

(9 citation statements)

References 4 publications

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“…[5,6] Finally, the parts contain several defects such as lack of melting, some problems of scanning strategy, entrapped gas in solidified material, or residual stresses. [7][8][9] The titanium alloys and especially the Ti-6Al-4V alloy are widely used in the aeronautical industry for their high specific strength (ratio between the ultimate strength and its low density) but also for their high corrosion resistance at temperatures up to 773 K (500°C). The high cost of the raw material has become an important driving force for the French aeronautical industry to manufacture near-net-shape components directly from additive processes.…”

Section: Introductionmentioning

confidence: 99%

As-Fabricated and Heat-Treated Microstructures of the Ti-6Al-4V Alloy Processed by Selective Laser Melting

Vilaro

Colin

Bartout

2011

Metall Mater Trans A

1,066

414

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International audienceSelective laser melting (SLM) is a rapid manufacturing process that enables the buildup of very complex parts in short delays directly from powder beds. Due to the high laser beam energy during very short interaction times and the high solidification rates of the melting pool, the resulting microstructure is out-of-equilibrium and particularly textured. This type of as-fabricated microstructure may not satisfy the aeronautical criterion and requires post heat treatments. Optimized heat treatments are developed, in one side, to homogenize and form the stable phases α and β while preventing exaggerated grain growth. In the other side, heat treatment is investigated to relieve the thermal stresses appearing during cooling. This study is aimed at presenting the various types of microstructure of the Ti-6Al-4V alloy after postfabrication heat treatments below or above the β transus. Tensile tests are then carried out at room temperature in order to assess the effect of the microstructures on the mechanical properties. The fine as-fabricated microstructure presents high yield and ultimate strengths, whereas the ductility is well below the standard. A strong anisotropy of fracture between the two loading directions is noted, which is attributed to the manufacturing defects. Conventional and optimized heat treatments exhibit high yield and ultimate strengths while the ductility is significantly improved. This is due to a new optimization of the process parameters allowing drastic reduction of the number of defects. These two heat treatments enable now a choice of the morphology of the grains between columnar or equiaxial as a function of the type of loading

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Section: Introductionmentioning

confidence: 99%

As-Fabricated and Heat-Treated Microstructures of the Ti-6Al-4V Alloy Processed by Selective Laser Melting

Vilaro

Colin

Bartout

2011

Metall Mater Trans A

1,066

414

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“…For the range of laser parameters tested, the dimension of the cellular structures only varies by several micrometers. Maziasz et al 9 evaluated the residual stress of spray formed and DMD deposited H13 and found that a tensile stress is produced during DMD in the deposited region, which was balanced with a compressive stress in the substrate. It was also noted that the DMD process produced an over tempering of the previous tracks, which is undesirable.…”

Section: Introductionmentioning

confidence: 99%

Characterization of microstructure and residual stress in a 3D H13 tool steel component produced by additive manufacturing

2014

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H13 tool steel was deposited using the additive manufacturing technique Direct Metal Deposition to produce a part having a wedge geometry. The wedge was characterized both in terms of microstructure and residual stress. It was found that phase transformations were significantly influencing the microstructure, which was then linked to the residual stress distribution as seen in Fig. 8. The residual stress distribution was found to be opposite to that reported in the literature. This was attributed to the low temperature martensitic phase transformation of the H13 tool steel and the subsequent tempering of the microstructure with an increasing number of layers of deposited material. The high hardness and compressive residual stress of the top 4 mm of the wedge are ideal in die casting and forging dies, as it will resist thermal fatigue. It also has a hardness higher than that produced by typical heat treatment processes.

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“…The residual stress in LENS components has been investigated both by experiments [11][12][13][14] and modeling [10,15,16]. Rangaswamy et al [11,12] measured the residual stresses in LENS components using neutron diffraction and contour method.…”

Section: Introductionmentioning

confidence: 99%

Residual stresses in LENS-deposited AISI 410 stainless steel plates

Wang

Felicelli

Pratt

2008

Materials Science and Engineering: A

118

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Residual stresses and microstructure of H13 steel formed by combining two different direct fabrication methods

Cited by 28 publications

References 4 publications

As-Fabricated and Heat-Treated Microstructures of the Ti-6Al-4V Alloy Processed by Selective Laser Melting

As-Fabricated and Heat-Treated Microstructures of the Ti-6Al-4V Alloy Processed by Selective Laser Melting

Characterization of microstructure and residual stress in a 3D H13 tool steel component produced by additive manufacturing

Residual stresses in LENS-deposited AISI 410 stainless steel plates

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