Structure and Properties of Gas Nitrided Layers on Nanoflex Stainless Steel

2012 ◽  
Vol 326-328 ◽  
pp. 291-296 ◽  
Author(s):  
Paweł Kochmański ◽  
Jolanta Baranowska
Keyword(s):  
Stainless Steel ◽  
Treatment Temperature ◽  
Structure And Properties ◽  
Influence Of Process Parameters ◽  
Gas Nitriding ◽  
Diffusion Layers ◽  
Treatment Conditions ◽  
Xrd Phase Analysis ◽  
Nitrogen Potential ◽  
Ammonia Atmosphere

The paper presents results of research on nitrided layers on Sandvik NanoflexTMprecipitation hardened stainless steel. The influence of process parameters on nitriding kinetics and structure of the layers was investigated. The gas nitriding process was conducted in a mixture of ammonia 50% and products of its dissociation, as well as in 100% ammonia atmosphere at temperature range 400500°C and time between 2 and 8 h. The obtained diffusion layers were examined using the following methods: light and scanning electron microscopy, XRD phase analysis and EDS chemical analysis. Mechanical properties were tested with hardness measurements. It was found that kinetics depends on treatment temperature and nitrogen potential of the atmosphere. Moreover, treatment conditions affecting Sphase formation and expanded martensite in nitrided layers are discussed.

Kinetics of Low Temperature Nitriding of Precipitation Hardened Stainless Steel

2011 ◽  
Vol 312-315 ◽  
pp. 530-535 ◽  
Author(s):  
Paweł Kochmański ◽  
Jolanta Baranowska
Keyword(s):  
Stainless Steel ◽  
Low Temperature ◽  
Chemical Elements ◽  
Nitrided Layer ◽  
Nitriding Time ◽  
Diffusion Layers ◽  
Optical Spectrometry ◽  
Xrd Phase Analysis ◽  
Time Changes ◽  
Kinetics Of

The paper presents results of research on nitrided layers on precipitation hardened stainless steel, known also as 1RK91 (Sandvik NanoflexTM). Samples were subjected to low temperature nitriding. The influence of nitriding parameters on nitriding kinetics was investigated. The nitriding process was carried out in a mixture of NH3 50% and products of its dissociation as well as in 100% ammonia atmosphere at temperature range 425-475°C. To investigate the kinetics of nitrided layer formation, the nitriding time changes between 2 and 8 h. The obtained diffusion layers were examined using the following methods: light and scanning electron microscopy, XRD phase analysis. The distribution profiles of selected chemical elements were acquired using optical spectrometry GDOES.

The effect of stadial nitrogenization on the structure and properties of martensitic steel 13X11N2V2MF

2021 ◽  
Vol 2021 (12) ◽  
pp. 12-19
Author(s):  
Mikhail Prokofev ◽  
Larisa Petrova ◽  
Irina Belashova ◽  
Petr Bibikov
Keyword(s):  
Wear Resistance ◽  
Martensitic Steel ◽  
New Method ◽  
Structure And Properties ◽  
High Quality ◽  
Corrosion Stability ◽  
Test Mode ◽  
Gas Nitriding ◽  
Diffusion Layers

A new method of gas nitriding is presented, which produces obtaining high-quality diffusion layers that meet the requirements of the use for various purposes, including aviation ones. Peculiar properties of highly alloyed martensitic steel nitriding after stadial thermo-gas-cyclic nitrogenization under partially dissociated ammonia with air additives have been examined. The results of metallographic studies, diagnostic leach, tests for wear resistance, impact hardness and corrosion stability, depending on the test mode are presented.

Titanium Coatings on AISI 316L Stainless Steel Formed by Thermal Decomposition of TiH2 in Vacuum

2009 ◽  
Vol 1243 ◽  
Author(s):  
Jorge López-Cuevas ◽  
José L. Rodríguez-Galicia ◽  
Juan C. Rendón-Angeles ◽  
Martín I. Pech-Canul ◽  
Juan Méndez-Nonell
Keyword(s):  
Thermal Decomposition ◽  
Stainless Steel ◽  
316L Stainless Steel ◽  
Treatment Temperature ◽  
Aisi 316L ◽  
Sintering Process ◽  
Aisi 316L Stainless Steel ◽  
Simultaneous Formation ◽  
Diffusion Layers ◽  
Titanium Coatings

ABSTRACTTi-coated AISI 316L stainless steel, for potential biomedical applications, is obtained by thermal decomposition of TiH2 under vacuum. The presence of hydrogen in the coating material facilitates the sintering process of Ti particles, with simultaneous formation of several inter-diffusion layers at the substrate/coating interface, whose thickness and chemical composition depend mainly on the treatment temperature. Coatings prepared at 1100°C exhibit formation of a wide zone at the substrate/coating interface, which is associated with the appearance of cracks, and which consists of a mixture of λ + χ + α-Fe phases. Formation of abundant microporosity is also observed in this region, which is attributed to the Kinkerdall effect.

Effects of Sintering Conditions on Properties of a Warm Compacted Stainless Steel Powder

2012 ◽  
Vol 217-219 ◽  
pp. 483-486
Author(s):  
Mei Yuan Ke
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Sintered Density ◽  
Sintering Temperature ◽  
Steel Powder ◽  
Stainless Steel Powder ◽  
Sintering Atmosphere ◽  
Comprehensive Properties ◽  
Ammonia Atmosphere ◽  
Sintering Conditions

Effects of Sintering atmosphere and temperature on properties of warm compacted 410L stainless steel powder were studied. Sintered density, hardness, tensile strength and elongation were measured. Results showed that in order to achieve high comprehensive properties, the optimal sintering temperature was 1230°C for 410L stainless steel powder. At the same sintering temperature, density and hardness sintered in vacuum were much higher than that sintered in cracked ammonia while tensile strength sintered in cracked ammonia were much higher than that in vacuum. When sintered in vacuum at 1230°C, sintered density was 7.45 g•cm-3, hardness was 65 HRB, tensile strength was 410 MPa and elongation was 29.5%. When sintered in cracked ammonia atmosphere at 1230°C, sintered density was 7.26 g•cm-3, hardness was 97 HRB, tensile strength was 515 MPa and elongation was 3.8%.

The effect of heat-treatment temperature on structure and properties of TiB2/C composites

Carbon ◽  
2007 ◽  
Vol 45 (6) ◽  
pp. 1200-1211 ◽  
Author(s):  
Changjun Zhou ◽  
William S. Kinman ◽  
Paul J. McGinn
Keyword(s):  
Heat Treatment ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Structure And Properties

Characteristics of Lithium Polysilicate Electrolyte Synthesized by Sol-Gel Processing

2007 ◽  
Vol 124-126 ◽  
pp. 1031-1034
Author(s):  
Bong Soo Jin ◽  
Bok Ki Min ◽  
Chil Hoon Doh
Keyword(s):  
Heat Treatment ◽  
Acid Treatment ◽  
Treatment Time ◽  
Sol Gel ◽  
Silicate Solution ◽  
Treatment Temperature ◽  
Lithium Silicate ◽  
Treatment Conditions ◽  
Xrd Patterns ◽  
Si Wafer

To find out suitable Si surface treatment and heat treatment conditions, acid treatment of Si wafer was done for lithium polysilicate electrolyte coating on Si wafer. In case of HCl treatment, the wet angle of a sample is 30o, which is the smallest wet angle of other acid in this experiment. Acid treatment time is 10 min, which is no more change of wet angle. Lithium polysilicate electrolyte was synthesized by hydrolysis and condensation of lithium silicate solution using perchloric acid. Thermal analysis of lithium polysilicate electrolyte shows the weight loss of ~23 % between 400 and 500 , which is due to the decomposition of LiClO4. The XRD patterns of the obtained lithium polysilicate electrolyte also show the decrement of LiClO4 peak at 400 . The optimum heat treatment temperature is below 400 , which is the suitable answer for lithium polysilicate electrolyte.

Effect of Heat Treatment Temperature and Lubricating Conditions on the Fretting Wear Behavior of SAF 2507 Super Duplex Stainless Steel

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Mengjiao Wang ◽  
Yunxia Wang ◽  
Jianzhang Wang ◽  
Na Fan ◽  
Fengyuan Yan
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Duplex Stainless Steel ◽  
Wear Behavior ◽  
Treatment Temperature ◽  
Fretting Wear ◽  
Super Duplex Stainless Steel ◽  
Wear Performance ◽  
Seawater Lubrication

Super duplex stainless steel (SDSS) has excellent mechanical properties and corrosion resistance. However, currently, there are few researches conducted on its fretting wear performance. This paper studies the influence of different heat treatment temperatures and medium environment on the fretting wear performance of SAF 2507 SDSS. Results show that the combined effect of the sigma phase and seawater lubrication can significantly improve the wear resistance of SAF 2507 SDSS. After treated with different heat treatment temperatures, different contents of sigma phases are precipitated out of SAF 2507 SDSS, which improves the wear resistance of the material to different degrees. In addition, the fretting wear performance of SAF 2507 SDSS also relates to the lubrication medium. In air, the friction and wear performance of SAF 2507 SDSS is poor, while in seawater, solution and corrosion products that acted as a lubricant dramatically improve the wear resistance of the material. Under the combined action of heat treatment and seawater lubrication medium, the friction coefficient and wear reduce by 70% and 91%, respectively.

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