A study of the micro- and nanoscale deformation behavior of individual austenitic dendrites in a FeCrMoVC cast alloy using micro- and nanoindentation experiments

Zeisig, Josephine; Hufenbach, J.; Wendrock, H.; Gemming, Thomas; Eckert, J.; Kühn, U.

doi:10.1063/1.4945403

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…This can be attributed to the significantly finer microstructure ( Figure 1 ) but is, at first glance, contrary to the lower offset yield strength of both conditions. However, it is known from the literature that the indenter of the hardness tester induces shear stress and deforms the material plastically, leading to a direct austenite into martensite transformation already during the indentation process [ 45 , 46 ]. Consequently, the hardness of the material with high contents of metastable retained austenite (36/38 wt%) is shifted to higher values because of the TRIP effect, and the real hardness is hardly determinable with the usual testing method.…”

Section: Resultsmentioning

confidence: 99%

Approach to Estimate the Phase Formation and the Mechanical Properties of Alloys Processed by Laser Powder Bed Fusion via Casting

et al. 2022

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A high-performance tool steel with the nominal composition Fe85Cr4Mo8V2C1 (wt%) was processed by three different manufacturing techniques with rising cooling rates: conventional gravity casting, centrifugal casting and an additive manufacturing process, using laser powder bed fusion (LPBF). The resulting material of all processing routes reveals a microstructure, which is composed of martensite, austenite and carbides. However, comparing the size, the morphology and the weight fraction of the present phases, a significant difference of the gravity cast samples is evident, whereas the centrifugal cast material and the LPBF samples show certain commonalities leading finally to similar mechanical properties. This provides the opportunity to roughly estimate the mechanical properties of the material fabricated by LPBF. The major benefit arises from the required small material quantity and the low resources for the preparation of samples by centrifugal casting in comparison to the additive manufacturing process. Concluding, the present findings demonstrate the high attractiveness of centrifugal casting for the effective material screening and hence development of novel alloys adapted to LPBF-processing.

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Section: Resultsmentioning

confidence: 99%

Approach to Estimate the Phase Formation and the Mechanical Properties of Alloys Processed by Laser Powder Bed Fusion via Casting

et al. 2022

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“…This was already established on a metastable austenitic‐martensitic cast steel alloy after microhardness and nanoindentation measurements. [ 35 ] It should be considered, that the phase transformation may affect the determined hardness value.…”

Section: Resultsmentioning

confidence: 99%

Novel Corrosion‐Resistant Tool Steels with Superior Wear Properties

et al. 2022

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Recent toolmaking faces a growing variety of challenges. Innovative solutions in material development and process technology are required. The application of high-strength and wear-resistant materials and composites in industrial production results in constantly increasing demands on the quality of tools and their performance. Furthermore, tools and moulds must withstand permanent use and superimposed loadings. A high strength, an adequate toughness as well as resistance against wear and corrosion of the applied materials are demanded in the processing of e.g., polymers and composites. Here, polymers with very hard fillers like corundum lead to aggressively abrasive wear conditions for the tools. [1,2] Additionally, the tools have to sustain a corrosive attack due to acids (e.g., hydrochloric and sulfuric acid) deriving from polymerisation and thermal degradation of the polymers. [2,3] Thus, corrosion-resistant cold-work steels (e.g., X90CrMoV18 containing 18% Cr) are primarily applied. Alloy designs in order to meet the rising requirements for tools in plastics processing were studied by e.g., Huth et al. [2,4] based on the attempts to produce corrosion-and wearresistant multiphase steels (e.g., X190CrVMo20-4 as well as X140CrNbMo12-10-2) by powder metallurgy (PM). PM steel tools can partly achieve longer service lives than conventionally produced tool steels, because of the enabled addition of a high number of alloying elements like C, Cr, Nb, V to build a lot of very hard (mono)carbides. However, their production is expensive and complex, and their repair and maintenance by e.g., deposition welding is extremely challenging due to the very high carbide content and enclosed production-related gases in the PM steels. [5] A near-net-shape tool production by casting provides an economical alternative to the mentioned timeconsuming and expensive PM manufacturing. Furthermore, by tailored alloy designs as well as targeted solidification and cooling processes, specific microstructures can be adjusted already in the as cast state without any additional forming and heat treatment procedure. Thus, mechanical post-processing can be minimized and subsequent heat treatment is reduced.A targeted alloy design and process optimization for the production of high-strength cast tools are presented in studies of Hufenbach et al. [6][7][8] The tailored casting technology implies high solidification rates ≥ 10 K s À1 by using a copper mould. [9] No additional heat treatment is required to produce castings with

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“…A Nano-indenter (Agilent G200) is used to evaluate the elastic modulus of fabricated nickel material. 41,42 The obtained Young's modulus is 98.1 6 7.1 GPa. Some other basic mechanical properties of nickel material can be obtained from the literature reviews.…”

Section: (B) and 4(c)mentioning

confidence: 92%

Rate dependent behaviors of nickel-based microcapsules

Zhang

Wang

Sun

et al. 2018

Applied Physics Letters

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In this work, nickel-based microcapsules with liquid core were fabricated through an electroless plating approach. The quasi-static and high speed impact behaviors of microcapsules were examined by in-house assembled setups which are able to evaluate properties of materials and structures in microlevel accurately. Results indicated that the fabricated microcapsules showed strong rate sensitivity and the nominal strength of the capsule increased (up to 62.1%) with the increase in loading rates (up to 8200 s−1). The reduced modulus of nickel-based microcapsules was three orders of magnitude larger than that of the traditional microcapsules. The findings revealed that the fabricated nickel-based microcapsules produced remarkable performances for both static and dynamic loading applications. A high speed camera with stereo microscope was used to observe the failure mode of the microcapsule during the impact, which is of great importance to study the mechanical behaviours of materials and structures. Different failure modes were identified as multi-cracks with more rough and tortuous fracture surfaces and debris were observed for the samples subject to impact loading. Finite element method was employed to further understand the physical phenomenon which fitted well with the experimental results. These results could inspire more fundamental studies on the core-shell microstructures and potential applications in multifunctional materials.

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A study of the micro- and nanoscale deformation behavior of individual austenitic dendrites in a FeCrMoVC cast alloy using micro- and nanoindentation experiments

Cited by 4 publications

References 23 publications

Approach to Estimate the Phase Formation and the Mechanical Properties of Alloys Processed by Laser Powder Bed Fusion via Casting

Approach to Estimate the Phase Formation and the Mechanical Properties of Alloys Processed by Laser Powder Bed Fusion via Casting

Novel Corrosion‐Resistant Tool Steels with Superior Wear Properties

Rate dependent behaviors of nickel-based microcapsules

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