KINETICS ANALYSIS OF HIGHER TEMPERATURE SALT BATH NITRIDING FOR AISI 1045 STEEL

2016 ◽  
Vol 23 (06) ◽  
pp. 1650049 ◽  
Author(s):  
MINGYANG DAI ◽  
YAO CHEN ◽  
YATING CHAI ◽  
JING HU
Keyword(s):  
Compound Layer ◽  
Salt Bath ◽  
Micro Hardness ◽  
Kinetics Analysis ◽  
Cross Sectional ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
Higher Temperature ◽  
1045 Steel ◽  
Salt Bath Nitriding

Rapid salt bath nitriding was conducted at higher temperature above 600[Formula: see text]C instead of normally used 560[Formula: see text]C for AISI 1045 steel. Optical microscopy (OM), X-ray diffraction (XRD) and micro-hardness tester were employed to characterize the microstructure, phase constituents and micro-hardness of the treated specimens. The results showed that salt bath nitriding at higher temperature could significantly increase the compound layer thickness and higher cross-sectional hardness can be obtained. Kinetics analysis illustrated that the nitrogen atoms diffusion coefficient was obviously increased with temperature, and the activation energy of nitrogen atom diffusion was decreased from 220[Formula: see text]kJ[Formula: see text]mol[Formula: see text] to 142[Formula: see text]kJ[Formula: see text]mol[Formula: see text].

scholarly journals THE INFLUENCE OF SALT BATH NITRIDING VARIABLES ON HARDNESS LAYER OF AISI 1045 STEEL

2016 ◽  
Vol 22 (3) ◽  
pp. 188
Author(s):  
Elhadj Ghelloudj ◽  
Hamid Djebaili ◽  
Mohamed Tahar Hannachi ◽  
Abdenour Saoudi ◽  
Bilal Daheche
Keyword(s):  
Compound Layer ◽  
Salt Bath ◽  
Case Depth ◽  
Nitriding Process ◽  
Hardness Profile ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
Layer Increase ◽  
1045 Steel ◽  
Salt Bath Nitriding

<span>The aim of  this paper is to study and analyze the effects of a surface controlled salt bath nitriding on the microhardness of AISI 1045 steel. The nitriding process were implemented in salt bath component at ten different times (from 1 h to 10 h) when temperature was constant at (520ºC). The nitriding process repeated of another specimens at the same times but the temperature was (580ºC).The microstructure of surface layers was investigated by optical microscopy. Hardness profiles were measured with low-load hardness testing to determine the growth of the case depth after nitriding. Microhardness testing was carried out on samples to investigate the hardness profile at the transition from the compound to the diffusion layer. The microhardness of surface of nitrided sample at 520ºC and 580ºC was observed in the range of 318–430 HV0.3 and 329–421 HV0.3, respectively. Experimental results showed that the nitrides ε-Fe2-3(N,C) and γ’-Fe4(N,C) present in the compound layer increase the microhardness. It is found that salt bath nitriding parameters (time and temperature) improves the microhardness. </span>

The enhancement effect of salt bath preoxidation on salt bath nitriding for AISI 1045 steel

2019 ◽  
Vol 484 ◽  
pp. 610-615 ◽  
Author(s):  
Tiantian Peng ◽  
Mingyang Dai ◽  
Wei Cai ◽  
Wei Wei ◽  
Kunxia Wei ◽  
...  
Keyword(s):  
Salt Bath ◽  
Enhancement Effect ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
1045 Steel ◽  
Salt Bath Nitriding

Study on Microstructure Character in the Deformable Regions of AISI-1045 Steel Fine Blanking with Negative Clearance

2009 ◽  
Vol 628-629 ◽  
pp. 541-546 ◽  
Author(s):  
J.H. Li ◽  
Wei Fu Fan ◽  
Zhong Mei Zhang
Keyword(s):  
Work Piece ◽  
Micro Hardness ◽  
Fine Blanking ◽  
Metallic Crystal ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
Metal Deformation ◽  
Negative Clearance ◽  
1045 Steel ◽  
The Relationship

This paper obtained work piece of fine blanking with negative clearance by experiment. The microstructure and fractography photograph in regions like rollover zone, shearing band, under sheared surface and fracture band were scanned by instrument of scanning electron microscope (SEM-JSM-6360LV). The fine-blanking with negative clearance makes the metal deformation regions into a state of triaxial stress precise and it causes an intense metallic stream that brings about inter-dislocation and distortion of metallic crystal product under the action of stronger force, so the metallic crystal is reset and the isometric metallic crystal of shearing zone is staved, sloped and pulled and it appears as dense lined and strip crystal. The paper analyzes the full course of producing and development of micro crack in the ejecting stage in the fine-blanking processing of negative clearance. And the course of final rupture is also analyzed. The relationship curve of blanking stroke and micro hardness is measured by Vickers Hardness instrument (MH-6). The deforming principle of fine blanking deformation with negative clearance is analyzed by means of microstructure, metallographic photograph and micro hardness.

scholarly journals COMPARISON OF SALT BATH PREOXIDATION AND AIR PREOXIDATION FOR SALT BATH NITRIDING

2019 ◽  
Vol 25 (2) ◽  
pp. 130
Author(s):  
Wenchen Mei ◽  
Jiqiang Wu ◽  
Mingyang Dai ◽  
Kunxia Wei ◽  
Jing Hu
Keyword(s):  
Compound Layer ◽  
Salt Bath ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardness Tester ◽  
Modified Surface ◽  
Salt Bath Nitriding ◽  
Modified Surface Layer

<p class="AMSmaintext1">Salt bath preoxidation was primarily conducted prior to salt bath nitriding, and the effect on salt bath nitriding was compared with that of conventional air preoxidation. Characterization of the modified surface layer was made by means of optical microscopy, scanning electron microscope (SEM), micro-hardness tester and x-ray diffraction (XRD). The results showed that the salt bath preoxidation could significantly enhance the nitriding efficiency. The thickness of compound layer was increased from 13.3μm to 20.8μm by salt bath preoxidation, more than 60% higher than that by conventional air preoxidation under the same salt bath nitriding parameters of 560℃ and 120min. Meanwhile, higher cross-section hardness and thicker effective hardening layer were obtained by salt bath preoxidation, and the enhancement mechanism of salt bath preoxidation was discussed.</p>

QPQ Salt Bath Nitriding and Corrosion Resistance

2006 ◽  
Vol 118 ◽  
pp. 131-136 ◽  
Author(s):  
Yuan Hui Li ◽  
De Fu Luo ◽  
Shao Xu Wu
Keyword(s):  
Corrosion Resistance ◽  
Water Solution ◽  
Salt Spray ◽  
Complex Salt ◽  
Compound Layer ◽  
Salt Bath ◽  
Nitriding Temperature ◽  
Surface Strengthening ◽  
Higher Temperature ◽  
Salt Bath Nitriding

The QPQ complex salt bath treatment is a type of surface strengthening technology which contains mainly salt bath nitriding and salt bath post-oxidizing processes. The effect of nitriding temperature and duration on the corrosion resistance of QPQ treated specimens is explored by immersion tests and salt spray tests in this paper. The material used in this study was 1020 annealed steel. In the immersion tests, the specimens were immersed in 3‰H2O2 and 10% NaCl water solution. In the salt spray tests, specimens were salt spray tested using a 5% NaCl neutral solution. The data indicate that, when the nitriding duration is less than 2 hours at temperature below 590(phase change will exist when the nitriding temperature is above 590 according to Fe-N phase diagram) , the higher temperature of the salt bath nitriding , the specimens will have the higher corrosion resistance. In addition we have found that nitriding for too short a time generates a thin compound layer, and nitriding for too long generates too much porosity. Both will deteriorate the corrosion resistance.

Duplex Surface Treatment of AISI 1045 Steel Via Pack Boriding and Plasma Nitriding: Characterization and Tribological Studies

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Ali Habibolahzadeh ◽  
Farahnaz Haftlang
Keyword(s):  
Surface Treatment ◽  
Plasma Nitriding ◽  
Coated Sample ◽  
Iron Nitrides ◽  
Wear Properties ◽  
Compact Structure ◽  
Cross Sectional ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
1045 Steel

For the first time, formation of cubic boron nitride (c-BN), besides Fe2B and iron nitrides, was detected in boronitride coating, which was applied via a duplex diffusional surface treatment. Boronitride coating was applied on AISI 1045 steel substrates via duplex treatment of pack boriding and plasma nitriding (B-PN). Scanning electron microscope (SEM), X-ray diffractometer (XRD), and pin-on-disk wear test were utilized to evaluate microstructures, phases, and wear properties of the coatings. The surface of the as-coated sample exhibited a pebblelike and compact structure, and the cross-sectional morphology of the coatings showed a saw-tooth interface with substrate. Duplex treated sample revealed superior wear resistance in comparison with the borided one.

scholarly journals Microstructure and Mechanical Properties Investigation of Ni35A-TiC Composite Coating Deposited on AISI 1045 Steel by Laser Cladding

2021 ◽  
Author(s):  
Hao Zhang ◽  
Guofu Lian ◽  
Qiang Cao ◽  
Yingjun Pan ◽  
Yang Zhang
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Coefficient Of Friction ◽  
Laser Energy ◽  
Steel Substrate ◽  
Micro Hardness ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
1045 Steel

Abstract In this research, the TiC-Ni35A composite coating was fabricated on the AISI 1045 steel substrate by laser cladding process. The cross-sectional morphology, microstructure, micro-hardness, and wear resistance of coatings obtained under different laser energy densities (E) and TiC powder ratios (PR) were analyzed. According to the results, all the coating had a reliable metallurgical bonding with the AISI 1045 steel substrate. The X-ray diffraction (XRD) analysis revealed that the coating phases were Ni and TiC. The average microhardness of the Ni35A-80wt.% TiC coating reached up to 75.12 HRC. The minimum coefficient of friction of the composite coating was only about 30% of the AISI 1045 substrate. The wear form was mainly adhesive wear when altering the TiC powder ratios, while the wear form also contained abrasion wear under different energy densities. The ability of decomposition and re-nucleation of TiC was significantly improved with the increase of laser energy densities and the decrease of TiC powder ratios. The micro-hardness, wear resistance, and coefficient of friction of the composite coating were improved because of the TiC strengthening phase particles. Compared with the AISI 1045 steel substrate, the micro-hardness and wear resistance of the composite coating was increased by 5.29 times and 6.26 times, respectively.

Study on Working Hardening for AISI-1020 and AISI-1045 Steel Fine-Blanking with Negative Clearance

2010 ◽  
Vol 431-432 ◽  
pp. 405-408 ◽  
Author(s):  
J.H. Li ◽  
Wei Fu Fan ◽  
Zhong Mei Zhang
Keyword(s):  
Work Hardening ◽  
Working Life ◽  
Work Piece ◽  
Micro Hardness ◽  
Fine Blanking ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
Negative Clearance ◽  
1045 Steel ◽  
Vickers Micro Hardness

This paper carries through pure shearing fine-blanking processing experiment with negative clearance for the AISI-1020、AISI-1045 steel and the relations curves of the blanking force and the blanking stroke is obtained. The micro hardness of the sheared surface for the blanked work pieces in breadthways and lengthways direction is measured by Vickers-micro hardness instrument (MH-6), thereby the relations curves of punch stroke and the micro-hardness of the blanking work pieces are gained. The relation between work hardening degree and blanking clearance for the negative blanking is obtained too. This paper focuses on formation mechanism of work hardening for the negative blanking and analyzes the work hardening capability of blanked work piece. The work hardening degree is compared to the materials which possess different hardening index. The research shows that the work hardening degree of the blanking work pieces is strengthened evidently by the fine-blanking with negative clearance and the hardening layer of blanking fracture could enhance structure intensity and wear resistance of blanking work piece evidently. Therefore, it could enhance fatigue strength exceedingly and extend the working life of work piece greatly.

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