2018
DOI: 10.1038/s41598-018-24589-4
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Micro-deformation evolutions of the constituent phases in duplex stainless steel during cyclic nanoindentation

Abstract: Cyclic elastoplastic deformation behaviors of austenite phase and ferrite phase in a duplex stainless steel were investigate by load-controlled cyclic nanoindentation with a Berkovich indenter. During the tests, the maximum penetration depth per cycle increased rapidly with cycle number at transient state, and reached stable at quasi-steady state. Plastic dissipated energy was quantitatively proved to be the driving force for the propagation of deformation zones during cyclic nanoindentation tests. Transmissio… Show more

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Cited by 15 publications
(5 citation statements)
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“…Once a large enough load F is applied to the grain, the plastic deformation occurs by the slip movements of dislocations. For the dislocations without nitrogen, the critical slip resistance τ 0 mainly includes the intrinsic lattice friction stress (Peirls-Nabarro stress) and the stresses by the short-range interaction between nearby dislocations and grain boundaries [ 36 , 37 , 38 ]. However, for the dislocation with nitrogen, an additional stress τ s is required to overcome the hindrance of nitrogen induced by both the pinning of the Cottrell atmosphere and Cr-N short-range order (SRO) [ 39 , 40 ], as shown in Figure 13 b.…”
Section: Discussionmentioning
confidence: 99%
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“…Once a large enough load F is applied to the grain, the plastic deformation occurs by the slip movements of dislocations. For the dislocations without nitrogen, the critical slip resistance τ 0 mainly includes the intrinsic lattice friction stress (Peirls-Nabarro stress) and the stresses by the short-range interaction between nearby dislocations and grain boundaries [ 36 , 37 , 38 ]. However, for the dislocation with nitrogen, an additional stress τ s is required to overcome the hindrance of nitrogen induced by both the pinning of the Cottrell atmosphere and Cr-N short-range order (SRO) [ 39 , 40 ], as shown in Figure 13 b.…”
Section: Discussionmentioning
confidence: 99%
“…The effect of nitrogen on the cyclic deformation behavior is mainly presente short-range interaction with the dislocation movements, as sketchily shown in Fi For the solution-treated material, the high temperature makes it easy for nitr diffuse towards the dislocations where lots of defects exist, as shown in Figure 13 a large enough load F is applied to the grain, the plastic deformation occurs by movements of dislocations. For the dislocations without nitrogen, the crit resistance τ0 mainly includes the intrinsic lattice friction stress (Peirls-Nabarro str the stresses by the short-range interaction between nearby dislocations an boundaries [36][37][38]. However, for the dislocation with nitrogen, an additional str required to overcome the hindrance of nitrogen induced by both the pinnin Cottrell atmosphere and Cr-N short-range order (SRO) [39,40], as shown in Fig Then, upon further cyclic loading, two kinds of competitive mechanisms jointly de the mechanical response, as shown in Figure 13c.…”
Section: Effect Of Nitrogen On Cyclic Deformationmentioning
confidence: 99%
“…The nanoindentation testing of Young's modulus of austenite and ferrite in duplex stainless steel is reported not to be affected by sample surface treating methods, i.e., mechanical polishing, electrolytic polishing and chemical etching, whereas this is not valid for hardness; the nanoindentation testing of hardness of austenite and ferrite in duplex stainless steel is affected by surface treatment, here, mechanical polishing [46]. Therefore, the elastic modulus (E) is selected in order to generate the 3D map representation, denoting the difference in nanoindentation response due to phase properties underneath the The nanoindentation testing of Young's modulus of austenite and ferrite in duplex stainless steel is reported not to be affected by sample surface treating methods, i.e., mechanical polishing, electrolytic polishing and chemical etching, whereas this is not valid for hardness; the nanoindentation testing of hardness of austenite and ferrite in duplex stainless steel is affected by surface treatment, here, mechanical polishing [46]. Therefore, the elastic modulus (E) is selected in order to generate the 3D map representation, denoting the difference in nanoindentation response due to phase properties underneath the indenter, for (a) Blend 1 XY, (b) Blend 1 XZ, (c) Blend 2 XY plane, (d) Blend 2 XZ plane (Figure 12).…”
Section: Nanomechanical Propertiesmentioning
confidence: 97%
“…Compared with austenitic stainless steel, duplex stainless steel has higher strength, and better resistance to stress corrosion cracking and pitting corrosion. Consequently, it is widely used in petrochemical, paper, and other industries [1][2][3][4].…”
Section: Introductionmentioning
confidence: 99%