Influence of microstructural features and deformation-induced martensite on hardening of stainless steel by cryogenic ultrasonic impact treatment

Vasylyev, M. O.; Mordyuk, B.N.; Sidorenko, S. I.; Voloshko, S. М.; Burmak, А. P.

doi:10.1016/j.surfcoat.2017.11.019

Cited by 55 publications

(14 citation statements)

References 45 publications

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“…3). Remarkably, the simultaneous presence of both martensitic phases in the studied AISI 321 austenitic stainless steel has been confirmed recently by TEM and X-ray diffraction techniques [43,44]. This effect was perhaps attributable to relatively low stacking fault energy of this material, i.e., ~20 mJ/m 2 at ambient conditions.…”

Section: Low-resolution Ebsd Observationssupporting

confidence: 56%

EBSD investigation of microstructure evolution during cryogenic rolling of type 321 metastable austenitic steel

Aletdinov

Mironov

Korznikova

et al. 2019

Materials Science and Engineering: A

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Electron backscatter diffraction (EBSD) was employed to establish microstructure evolution in type 321 metastable austenitic stainless steel during rolling at a near-liquid-nitrogen temperature. A particular emphasis was given to evaluation of microstructure-strength relationship. As expected, cryogenic rolling promoted strain-induced martensite transformation. The transformation was dominated by the →sequence but clear evidence of the →→ transformation path was also found. The martensitic reactions were found to occur almost exclusively within deformation bands, i.e., the most-highly strained areas in the austenite. This prevented a progressive development of deformation-induced boundaries and thus suppressed the normal grain-subdivision process in this phase. On the other hand, the preferential nucleation of martensite within the deformation bands implied a close relationship between the transformation process and slip activity in parent austenite grains. Indeed, the martensite reactions were found to occur preferentially in austenite grains with crystallographic orientations close to Goss {110}<100> and Brass {110}<112>. Moreover, the martensitic transformations were governed by preferential variant selection which was most noticeable in -martensite. The sensitivity of the martensitic reactions to the crystallographic orientation of the austenite grains resulted in re-activation of the transformation process after development of a deformation-induced texture in the austenitic phase at high strains. Both martensitic phases were concluded to experience plastic strain which resulted in measurable changes in misorientation distributions. Cryogenic rolling imparted dramatic strengthening resulting in a more-than-sixfold increase in yield strength. The main source of hardening was the martensitic transformation with lesser contributions from dislocations and subboundary strengthening of the austenite.

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Section: Low-resolution Ebsd Observationssupporting

confidence: 56%

EBSD investigation of microstructure evolution during cryogenic rolling of type 321 metastable austenitic steel

Aletdinov

Mironov

Korznikova

et al. 2019

Materials Science and Engineering: A

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“…For the microstructure without DCT, the dendrite and equiaxed crystal mixing zone was formed on the surface, as shown in Figure 3a. However, the dendrites were gradually homogenized as the DCT time increased [11,12,13] (Figure 3b–d). Among them, the microstructure homogenization effect after 6 and 9 h of DCT was the best.…”

Section: Resultsmentioning

confidence: 99%

Effect of Deep Cryogenic Treatment on Microstructure and Wear Resistance of LC3530 Fe-Based Laser Cladding Coating

Zhang

Zhou

2019

Materials

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The effect of deep cryogenic treatment on microstructure and wear resistance of LC3530 Fe-based powder laser cladding coating was investigated in this paper. The cladding coating was subjected to deep cryogenic treatment for the different holding times of 3, 6, 9, 12, and 24 h, followed by tempering at room temperature. Microstructure of the cladding coating was observed by optical microscope (OM) and the microhardness was measured by the Vickers-hardness tester. The wear was tested by ball and flat surface grinding testing conducted on the material surface comprehensive performance tester. The wear scars were analyzed using a non-contact optical surface profiler and scanning electron microscope (SEM). The results showed the grain size of cladding coating after 12 h of deep cryogenic treatment was significantly reduced by 36.50% compared to the non-cryogenically treated cladding coating, and the microhardness value increased by approximately 34%. According to the wear coefficient calculated by the Archard model, the wear resistance improved about five times and the wear mechanism was micro-ploughing. The deep cryogenic treatment could enhance the wear resistance of the cladding coating by forming a wear resistant alloy compound and higher surface microhardness.

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“…In recent years, researchers have developed various surface treatment (UST) processes based on UV, such as ultrasonic shot peening [103][104][105], ultrasonic impact treatment [106][107][108], and ultrasonic surface rolling [85,109,110]; the principles of the different UST processes are similar. Severe plastic deformation on the material surface is caused by high-frequency vibration tools, which rapidly change the structure of the surface layer and improve the mechanical properties of the material, such as the elongation and yield ratio [86,87,108,[111][112][113][114][115].…”

Section: Strengthen Surface Structurementioning

confidence: 99%

A Review on Ultrasonic-Assisted Forming: Mechanism, Model, and Process

Shao

Zhan

2021

Chin. J. Mech. Eng.

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Compared with conventional forming processes, ultrasonic-assisted forming technology with a high frequency and small amplitude can significantly improve the forming quality of materials. Owing to the advantages of reduced forming force, improved surface quality, avoidance of forming defects, and strengthened surface structure, ultrasonic-assisted forming technology has been applied to increasingly advanced forming processes, such as incremental forming, spinning, and micro-forming. However, in the ultrasonic-assisted forming process, there are multiple ultrasonic mechanisms, such as the volume effect and surface effect. The explanation of the effect of ultrasonic vibration (UV) on plastic deformation remains controversial, hindering the development of related technologies. Recently, many researchers have proposed many new theories and technologies for ultrasonic-assisted forming. To summarize these developments, systematic discussions on mechanisms, theoretical models, and forming performances are provided in this review. On this basis, the limitations of the current study are discussed. In addition, an outlook for ultrasonic-assisted forming is proposed: efficient and stable UV systems, difficulty forming components with complex geometry, explanation of the in-depth mechanism, a systematic theoretical prediction model, and multi-field-coupling energy-assisted forming are considered to be hot spots in future studies. The present review enhances existing knowledge of ultrasonic-assisted forming, and facilitates a fast reference for related researchers.

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Influence of microstructural features and deformation-induced martensite on hardening of stainless steel by cryogenic ultrasonic impact treatment

Cited by 55 publications

References 45 publications

EBSD investigation of microstructure evolution during cryogenic rolling of type 321 metastable austenitic steel

EBSD investigation of microstructure evolution during cryogenic rolling of type 321 metastable austenitic steel

Effect of Deep Cryogenic Treatment on Microstructure and Wear Resistance of LC3530 Fe-Based Laser Cladding Coating

A Review on Ultrasonic-Assisted Forming: Mechanism, Model, and Process

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