Significant enhancement of strength in a lamellar-type nanostructured maraging steel subjected to equal-channel angular pressing for 12 passes

Yang, Maosheng; Yang, Gang; Liu, Z.D.; Wang, C.; Huang, Chongxiang

doi:10.1016/j.msea.2012.04.014

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…When the disks are further strained to 5 turns, the tensile strength continues to increase, but the elongation becomes negligible, displaying a typical brittle fracture behavior. The tensile strength is as high as 2600 MPa after 5 turns, and this is comparable with the value in a lamellar-type nanostruc-100 tured maraging steel subjected to ECAP for 12 passes [18]. According to the tensile stress-strain curves, the ultimate tensile strength (UTS) of the high-nitrogen austenitic stainless steel (HNS) steel specimens subjected to different turns of HPT is shown in Figure 1b.…”

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confidence: 55%

Strength, damage and fracture behaviors of high-nitrogen austenitic stainless steel processed by high-pressure torsion

et al. 2015

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confidence: 55%

Strength, damage and fracture behaviors of high-nitrogen austenitic stainless steel processed by high-pressure torsion

et al. 2015

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“…A commercial maraging steel specified as C250 was used in the investigation (chemical composition, wt.%: C 0.003, Mn 0.02, Ni 18.36, Co 8.18, Mo 4.75, Ti 0.46, Si 0.02, S 0.001, P 0.005 and Fe balance). The material preparation can be found in our previous work [6]. ECAP experiments were performed using a split die that could yield an effective strain of ~1 for a single pass [7], with two channels intersecting at inner angle of 90 o and outer angle of 30 o .…”

Section: Methodsmentioning

confidence: 99%

“…In our previous work [6][7][8], we reported that equal-channel angular pressing (ECAP) method was very effective in the refinement of the lath size, and lath width could be readily controlled during the multi-pass ECAP process. Accordingly, the yield strength of maraging steel was significantly enhanced by refining lath width down into nano-order via ECAP technique.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characterizations of Maraging Steel Processed by Equal-Channel Angular Pressing

Yang

Liu

et al. 2013

MSF

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Microstructures of a maraging steel subjected to equal-channel angular pressing (ECAP) up to 16 passes at room temperature were investigated. Electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) examinations showed that the microstructures of the as-processed samples were characterized by a well-defined lamellar structure. With increasing the number of ECAP passes from 1 to 16, the lamellar spacing was significantly decreased from ~323 nm to ~54 nm, while the volume fraction of high-angle lamellar boundaries (HALBs, having the misorientation larger than 15o) was obviously increased form ~46% to ~80%. The real lamellar-type nanostructured microstructures were completely accomplished in the tested steel after 8 or more ECAP passes. In addition, the grain refinement mechanism of maraging steel during the processing was discussed in detail.

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“…Unfortunately, there exist some problems for traditional austenitic grain (γ) refinement technology of maraging steels. Firstly, some severe plastic deformation technology, such as equal channel angular process (ECAP) [18,19] and high pressure torsion (HPT) can effectively reduce the grain (γ) size. However, a large amount of crystal defects will also be introduced so that the toughening effect is weakened.…”

Section: Introductionmentioning

confidence: 99%

Development of New Cobalt-Free Maraging Steel with Superior Mechanical Properties via Electro-Pulsing Technology

Pan

Zhao

Wang

et al. 2019

Metals

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The ductility of cobalt-free maraging steel is unsatisfactory because of the high content of Ti. Traditional heat treatment can not effectively improve the ductility of this kind steel. In this contribution, high-energy electro-pulsing is adopted in a T250 steel to solve this problem efficiently. It is found that the EPS treatment (electro-pulsing treatment under water-cooling condition) can accelerate the formation of retained austenite and nano stacking faults. Meanwhile, the microstructure is also refined by EPS treatment. Then, taking the EPS sample as the initial state, nano-reverted austenite combined with finer η-Ni3Ti precipitates are formed during EPA treatment (electro-pulsing treatment under air-cooling condition), compared with TA (traditional aging) treatment. The results of mechanical properties indicate that the strength and elongation are both enhanced by electro-pulsing treatment. Consequently, the electro-pulsing treatment can be a promising technology to devise cobalt-free maraging steel with better properties.

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Significant enhancement of strength in a lamellar-type nanostructured maraging steel subjected to equal-channel angular pressing for 12 passes

Cited by 7 publications

References 21 publications

Strength, damage and fracture behaviors of high-nitrogen austenitic stainless steel processed by high-pressure torsion

Strength, damage and fracture behaviors of high-nitrogen austenitic stainless steel processed by high-pressure torsion

Microstructural Characterizations of Maraging Steel Processed by Equal-Channel Angular Pressing

Development of New Cobalt-Free Maraging Steel with Superior Mechanical Properties via Electro-Pulsing Technology

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