Microstructural evolution of a Ni-Fe-Cr-base superalloy during non-isothermal two-stage hot deformation

Lin, Y.C.; Wu, Fan; Wang, Qian-Wei; Chen, Dongdong; Singh, Swadesh Kumar

doi:10.1016/j.vacuum.2018.02.034

Cited by 48 publications

(15 citation statements)

References 52 publications

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“…Due to the low deformation temperature, the original grains were elongated and shear bands appeared, primarily at grain boundaries. This means that the stress was concentrated there, leading to work hardening [ 19 , 20 , 21 ]. With the increase in temperature, dynamic recrystallization occurred, as shown in Figure 1 c. It is worth noting that the recrystallized grains mainly formed at the grain boundary.…”

Section: Resultsmentioning

confidence: 99%

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

et al. 2020

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Cu-Ni-Si alloys are widely used in lead frames and vacuum devices due to their high electrical conductivity and strength. In this paper, a Cu-Ni-Co-Si-Cr-(Ce) alloy was prepared by vacuum induction melting. Hot compression tests of the Cu-Ni-Co-Si-Cr and Cu-Ni-Co-Si-Cr-Ce alloys were carried out using a Gleeble-1500 simulator at 500–900 °C deformation temperatures and 0.001–10 s−1 strain rates. The texture change was analyzed by electron backscatter diffraction. The <110> fiber component dominated the texture after compression, and the texture intensity was reduced during recrystallization. Moreover, the average misorientation angle φ for Cu-Ni-Co-Si-Cr-Ce (11°) was lower than that of Cu-Ni-Co-Si-Cr (16°) under the same conditions. Processing maps were developed to determine the optimal processing window. The microstructure and precipitates of the Cu-Ni-Co-Si-Cr and Cu-Ni-Co-Si-Cr-Ce alloys were also analyzed. The average grain size of the Cu-Ni-Co-Si-Cr-Ce alloy (48 μm) was finer than that of the Cu-Ni-Co-Si-Cr alloy (80 μm). The average size of precipitates in the Cu-Ni-Co-Si-Cr alloy was 73 nm, while that of the Cu-Ni-Co-Si-Cr-Ce alloy was 27 nm. The addition of Ce delayed the occurrence of dynamic recrystallization.

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Section: Resultsmentioning

confidence: 99%

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

et al. 2020

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“…Afterwards, it progressively decreases until a fairly steady state appears. The feature of the true stress-strain curves can be ascribed to the intense competition between the work hardening and dynamic softening (caused by DRV and DRX) mechanisms [3,4,7,30]. At the incipient deformation stage, the multiplication and accumulation of dislocation stimulate the intense work hardening in the deformed block.…”

Section: Resultsmentioning

confidence: 99%

“…At the incipient deformation stage, the multiplication and accumulation of dislocation stimulate the intense work hardening in the deformed block. However, the dynamic recovery induced by dislocation climb and cross-slip is too weak to neutralize the work hardening [7,10,12,31]. Thus, the true stress rapidly rises with the increase of true strain.…”

Section: Resultsmentioning

confidence: 99%

“…Deformation behaviors of alloys in high temperature forming processes (hot rolling, forging and extrusion) are often complicated, and difficult to accurately describe [1]. It is recognized that the deformation temperature and strain rate play huge impacts on the mechanisms of work hardening, as well as dynamic softening induced by dynamic recrystallization (DRX) [2][3][4][5] or dynamic recovery (DRV) [6][7][8][9][10]. The constitutive models link with flow stress, temperature and the strain rate, mathematically represents the flow properties of alloys.…”

Section: Introductionmentioning

confidence: 99%

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A Strain-Compensated Constitutive Model for Describing the Hot Compressive Deformation Behaviors of an Aged Inconel 718 Superalloy

Zhou

Chen

Qin

2018

High Temperature Materials and Processes

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The hot deformation behaviors of an aged Inconel 718 superalloy are investigated by isothermal compression experiments at four strain rates and five deformation temperatures on a Gleeble-3500 thermo-mechanical simulator. The experimental results show that the true stresses are obviously affected by strain rate and deformation temperature. The true stress increases rapidly at the beginning of hot compressive deformation, which ascribes to the intense work hardening. The true stresses at high deformation temperatures are lower than those at lower deformation temperatures. The dynamic softening induced by DRX is weak at a relatively low deformation temperature. A strain-compensated Arrhenius-type constitutive equation linked with true stress, strain rate and deformation temperature is developed for the studied superalloy. The material constants (\alpha , n, Q and A) in the developed model are expressed as the functions of true strain. The flow stresses calculated by the developed constitutive equation are nicely consistent with the experimental ones, which confirms that the developed constitutive equation can accurately describe the hot deformation behaviors of the studied superalloy.

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“…Steels carried at temperatures only above the (upper) critical the grain size should remain low. Nevertheless, at higher temperatures, various steels showed large variance in grain size, based on the chemical composition and steel producing methods (deoxidation and previous treatment) [15][16]. Fine-grain microstructure of cryogenic samples do not harden as strongly and have less potential to break than comparable tested coarse-grain steels.…”

Section: Fig 8 Comparison Of Mechanical Properties For Tempered Sammentioning

confidence: 98%

Investigation of Microstructure and Mechanical Properties of Austenite Stainless Steel 304 during Tempering and Cryogenic Heat Treatment

Lakshmi¹,

Swathi²,

Buddi³

et al. 2020

E3S Web Conf.

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In the present study, the influence of heat treatment (tempering & cryogenic) on the grain orientation and few important mechanical properties of Austenite Stainless Steel 304 (ASS 304) are examined. The significant mechanical properties like ultimate strength, elongation percentage and surface hardness etc., of the experimented and untreated specimens are computed using pre standard methods and the micrographs of the specimens was conducted using metallurgical microscope. The effect of strain rate ranging from lower to higher strain rates 0.001s-1 to 0.1s-1, on true stress - true strain behaviour of tempered austenitic stainless steel 304 is investigated. Experimental results exhibited that the mechanical behaviour of ASS 304 can be reformed and improvised by several heat treatment procedures for a specific application. The results showed that the cryogenic treated specimens indicate lowest tensile strength, hardness and highest percent of elongation value compared with tempered specimen gave the maximum tensile strength, hardness and minimum percent of elongation in length value.

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Microstructural evolution of a Ni-Fe-Cr-base superalloy during non-isothermal two-stage hot deformation

Cited by 48 publications

References 52 publications

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

A Strain-Compensated Constitutive Model for Describing the Hot Compressive Deformation Behaviors of an Aged Inconel 718 Superalloy

Investigation of Microstructure and Mechanical Properties of Austenite Stainless Steel 304 during Tempering and Cryogenic Heat Treatment

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