FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W116100188> ?p ?o ?g. }

• W116100188 endingPage "170" @default.
• W116100188 startingPage "159" @default.
• W116100188 abstract "Bake hardening of steels during paint baking of an automotive body could result in an increase of their strength. In this work, the effect of pre-straining and bake-hardening on the microstructure and mechanical properties has been investigated in thermomechanically processed CMnSi Transformation-Induced Plasticity (TRIP) steels with and without additions of Nb and Mo. The steels were characterised before and after bake hardening at 180C for 30 min. by transmission electron microscopy (TEM), X-ray diffraction (XRD), atom probe tomography (APT), and tensile tests. The microstructure of the thermomechanically processed (TMP) TRIP steels consisted of polygonal ferrite, bainite, retained austenite and martensite. Fine Nb and Mo carbides were detected by TEM in the microstructure of the alloyed steel. In addition, APT revealed the presence of Nb-, Mo-, Fe-, Ccontaining clusters. Cottrell atmospheres were also detected in the ferrite phase of the CMnSi steel. After pre-straining and bake hardening (PS/BH) both steels exhibit continuous yielding behaviour. The observed higher yield and tensile strengths of the PS/BH samples in comparison with the TMP samples were due to an increase in the number density of dislocations and their interaction with iron carbides formed in bainite and martensite. In addition, the number density of fine Nb and Mo carbides was significantly increased in the alloyed TRIP steel after PS/BH, which also contributed to significant precipitation strengthening in the NbMo steel. Introduction Thermomechanically processed C-Mn-Si Transformation-Induced Plasticity (TRIP) steels exhibit an excellent combination of strength (700-1000 MPa) and ductility (30-40% total elongation) [1]. The interaction of all phases present in the microstructure (polygonal ferrite, carbide-free bainite, retained austenite and martensite) during deformation and the deformation-induced transformation of the metastable retained austenite to martensite at room temperature [2-4] are thought to be responsible for these mechanical properties. These TRIP steels could be possible candidates for automotive applications. Additional alloying with Nb and/or Mo provides the further strength increase through an increase in hardenability, microstructure refinement and precipitation strengthening [5,6]. During paint baking of an automotive body, the steels are strain aged, which results in a further increase in yield strength of ~100-200 MPa and improved dent and crash resistance [7]. Recently, research on bake hardening of intercritically annealed CMnSi TRIP steels has shown an increase in yield strength and the appearance of yield point after 2-10% pre-straining and baking at 170-180 C for 20-30 min. [5, 811]. The discontinuous yielding behaviour is undesirable in auto body applications. Limited work on bake hardening of thermomechanically processed TRIP steels also has shown an increase in the yield and tensile strengths, but it is accompanied by continuous yielding behaviour [11,12], which indicates a difference in the bake hardening mechanisms operating in these steels. This paper addresses the effect of post-processing on the microstructure and mechanical properties of thermomechanically processed CMnSi TRIP steels with and without Nb and Mo additions. In particular, attention is given to the characterisation of solute segregation and nanosize particles by atom probe tomography. Experimental Two steels with compositions given in Table 1 were subjected to thermomechanical processing simulations using a laboratory rolling mill at Deakin University. The details of the processing schedule are described elsewhere [3,12]. The selected parameters are given in Table 1. After the simulation of coiling in a fluidized bed furnace, the samples were quenched to room temperature. Tensile specimens were machined from the strip and subjected to 4% pre-straining (PS) before bake hardening (BH) at 180 C for 30 min. Room temperature mechanical properties of the samples after TMP and TMP/BH/PS were determined with an Instron 4500 servohydraulic tensile testing machine with a 100 kN load cell. The resultant microstructures were characterised with a Philips CM20 transmission electron microscope operated at 200kV and an Imago Scientific Instruments local electrode atom probe (LEAP). The samples for both studies were cut perpendicular to the deformation (rolling) direction. TEM thin foils were prepared by twin jet electropolishing using a solution of 5% perchloric acid in methanol at –20 °C with an operating voltage of 30 V. In addition, the carbon extraction replica technique was used to study precipitates in the NbMo steel. The dislocation density was calculated by counting the number of dislocation intersections (N) with random lines of length L [10]. A test line on the foil corresponds to a test area of L x t going down into the foil (where t is the foil thickness). So, the dislocation density (Λ), is given by [14]:" @default.
• W116100188 created "2016-06-24" @default.
• W116100188 creator A5018456547 @default.
• W116100188 creator A5038392299 @default.
• W116100188 creator A5052574824 @default.
• W116100188 date "2008-01-01" @default.
• W116100188 modified "2023-09-27" @default.
• W116100188 title "Effect of Nb and Mo additions on the microstructure and mechanical properties of thermomechanically processed and bake hardened CMnSi TRIP steel" @default.
• W116100188 cites W1537671621 @default.
• W116100188 cites W1974085346 @default.
• W116100188 cites W2015024259 @default.
• W116100188 cites W2491645015 @default.
• W116100188 cites W3110500115 @default.
• W116100188 hasPublicationYear "2008" @default.
• W116100188 type Work @default.
• W116100188 sameAs 116100188 @default.
• W116100188 citedByCount "1" @default.
• W116100188 crossrefType "journal-article" @default.
• W116100188 hasAuthorship W116100188A5018456547 @default.
• W116100188 hasAuthorship W116100188A5038392299 @default.
• W116100188 hasAuthorship W116100188A5052574824 @default.
• W116100188 hasConcept C112950240 @default.
• W116100188 hasConcept C149912024 @default.
• W116100188 hasConcept C154634170 @default.
• W116100188 hasConcept C159985019 @default.
• W116100188 hasConcept C18747287 @default.
• W116100188 hasConcept C191897082 @default.
• W116100188 hasConcept C192562407 @default.
• W116100188 hasConcept C2776512210 @default.
• W116100188 hasConcept C2776704300 @default.
• W116100188 hasConcept C2776791112 @default.
• W116100188 hasConcept C2778145928 @default.
• W116100188 hasConcept C2779227376 @default.
• W116100188 hasConcept C37210646 @default.
• W116100188 hasConcept C44125496 @default.
• W116100188 hasConcept C44255700 @default.
• W116100188 hasConcept C5335593 @default.
• W116100188 hasConcept C87976508 @default.
• W116100188 hasConcept C96288455 @default.
• W116100188 hasConceptScore W116100188C112950240 @default.
• W116100188 hasConceptScore W116100188C149912024 @default.
• W116100188 hasConceptScore W116100188C154634170 @default.
• W116100188 hasConceptScore W116100188C159985019 @default.
• W116100188 hasConceptScore W116100188C18747287 @default.
• W116100188 hasConceptScore W116100188C191897082 @default.
• W116100188 hasConceptScore W116100188C192562407 @default.
• W116100188 hasConceptScore W116100188C2776512210 @default.
• W116100188 hasConceptScore W116100188C2776704300 @default.
• W116100188 hasConceptScore W116100188C2776791112 @default.
• W116100188 hasConceptScore W116100188C2778145928 @default.
• W116100188 hasConceptScore W116100188C2779227376 @default.
• W116100188 hasConceptScore W116100188C37210646 @default.
• W116100188 hasConceptScore W116100188C44125496 @default.
• W116100188 hasConceptScore W116100188C44255700 @default.
• W116100188 hasConceptScore W116100188C5335593 @default.
• W116100188 hasConceptScore W116100188C87976508 @default.
• W116100188 hasConceptScore W116100188C96288455 @default.
• W116100188 hasLocation W1161001881 @default.
• W116100188 hasOpenAccess W116100188 @default.
• W116100188 hasPrimaryLocation W1161001881 @default.
• W116100188 hasRelatedWork W1483510046 @default.
• W116100188 hasRelatedWork W1974262202 @default.
• W116100188 hasRelatedWork W1990319755 @default.
• W116100188 hasRelatedWork W2000945659 @default.
• W116100188 hasRelatedWork W2013921383 @default.
• W116100188 hasRelatedWork W2022128386 @default.
• W116100188 hasRelatedWork W2051341279 @default.
• W116100188 hasRelatedWork W2103407945 @default.
• W116100188 hasRelatedWork W2169220339 @default.
• W116100188 hasRelatedWork W2257914395 @default.
• W116100188 hasRelatedWork W2562305319 @default.
• W116100188 hasRelatedWork W2888949740 @default.
• W116100188 hasRelatedWork W2917618827 @default.
• W116100188 hasRelatedWork W2940776242 @default.
• W116100188 hasRelatedWork W2943227289 @default.
• W116100188 hasRelatedWork W2957443406 @default.
• W116100188 hasRelatedWork W2968492431 @default.
• W116100188 hasRelatedWork W856461641 @default.
• W116100188 hasRelatedWork W2277396881 @default.
• W116100188 hasRelatedWork W966112693 @default.
• W116100188 isParatext "false" @default.
• W116100188 isRetracted "false" @default.
• W116100188 magId "116100188" @default.
• W116100188 workType "article" @default.