Effect of interpass temperature on the formation of retained austenite in a wire arc additive manufactured ER420 martensitic stainless steel

2021 ◽  
Vol 266 ◽  
pp. 124555
Author(s):  
Alireza Vahedi Nemani ◽  
Mahya Ghaffari ◽  
Salar Salahi ◽  
Jonas Lunde ◽  
Ali Nasiri
Keyword(s):  
Stainless Steel ◽  
Retained Austenite ◽  
Martensitic Stainless Steel ◽  
Interpass Temperature

scholarly journals Nanotribological behavior of deep cryogenically treated martensitic stainless steel

2017 ◽  
Vol 8 ◽  
pp. 1760-1768 ◽  
Author(s):  
Germán Prieto ◽  
Konstantinos D Bakoglidis ◽  
Walter R Tuckart ◽  
Esteban Broitman
Keyword(s):  
Stainless Steel ◽  
Retained Austenite ◽  
Elastic Limit ◽  
Martensitic Stainless Steel ◽  
Tribological Performance ◽  
Low Carbon ◽  
Displacement Control ◽  
Friction Behavior ◽  
Steel Alloys ◽  
First Time

Cryogenic treatments are increasingly used to improve the wear resistance of various steel alloys by means of transformation of retained austenite, deformation of virgin martensite and carbide refinement. In this work the nanotribological behavior and mechanical properties at the nano-scale of cryogenically and conventionally treated AISI 420 martensitic stainless steel were evaluated. Conventionally treated specimens were subjected to quenching and annealing, while the deep cryogenically treated samples were quenched, soaked in liquid nitrogen for 2 h and annealed. The elastic–plastic parameters of the materials were assessed by nanoindentation tests under displacement control, while the friction behavior and wear rate were evaluated by a nanoscratch testing methodology that it is used for the first time in steels. It was found that cryogenic treatments increased both hardness and elastic limit of a low-carbon martensitic stainless steel, while its tribological performance was enhanced marginally.

scholarly journals Effect of Multiple-Pass Friction Stir Processing on Hardness and Corrosion Resistance of Martensitic Stainless Steel

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 620
Author(s):  
Linlin Pan ◽  
Chi Tat Kwok ◽  
Kin Ho Lo
Keyword(s):  
Stainless Steel ◽  
Friction Stir Processing ◽  
Retained Austenite ◽  
Active Sites ◽  
Martensitic Stainless Steel ◽  
Microstructural Change ◽  
Nacl Solution ◽  
Corrosion Attack ◽  
Chromium Carbides ◽  
Friction Stir

In the present study, the influence of multi-pass friction stir processing (FSP) of AISI 420 martensitic stainless steel on the microstructure, hardness, and corrosion behavior was investigated. Similar to single-pass FSPed 420, the multi-pass FSPed specimens with different overlapping ratios incurred microstructural change at the center and retreating side of the second track with martensite, retained austenite, and chromium carbides. Overlapping of the two successive tracks in the multi-pass FSPed 420 led to back-tempering and a local drop in hardness at the advancing side of the second track. The precipitation of chromium carbides in the tempered regions of the multi-pass FSPed specimens became the active sites for preferential corrosion attack in the 3.5 wt.% NaCl solution at 25 °C.

scholarly journals Effect of austenitising heat treatment on microstructure and properties of a nitrogen bearing martensitic stainless steel

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 601-606 ◽  
Author(s):  
Xiao Li ◽  
Yinghui Wei
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Stainless Steel ◽  
Retained Austenite ◽  
Martensitic Stainless Steel ◽  
Optimum Combination ◽  
Holding Time ◽  
Air Cooling ◽  
Metal Release ◽  
Scanning Electron

Abstract The effect of austenitising heat treatment on the microstructure, hardness and metal release of the nitrogen bearing, martensitic stainless steel 420U6 was investigated. The heat treatment was carried out at temperatures between 950 to 1,150∘C with a holding time between 30 to 120min, followed by air cooling. The quenched microstructures observed by a scanning electron microscope indicated that by increasing the austenitising temperature and holding time, the number of carbides decreases while the grain size and the amount of retained austenite increases. For a given holding time, the hardness increases to a peak and then decreases continuously with the increase of temperature. The metal release test, according to the GB 4806.9-2016 standard, reveals that the metal release concentration is highly affected by the austenitising temperature. The parameters of the austenitising heat treatment, which can achieve the optimum combination of hardness and metal release, were obtained.

Influence of Heat Treatment on the Microstructure and Properties of 7Cr17Mo Martensitic Stainless Steel

2013 ◽  
Vol 820 ◽  
pp. 15-19
Author(s):  
Xiao Dong Du ◽  
Zi Li Song ◽  
Yi Qing Chen ◽  
Jia Qing Wang ◽  
Guang Fu Liu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Retained Austenite ◽  
Treatment Process ◽  
Martensitic Stainless Steel ◽  
Optical Microscope ◽  
Heat Treatment Process ◽  
Quenching Temperature ◽  
Microstructure And Properties ◽  
The Impact

This paper describes the influence of heat treatment process on the microstructure and properties of a new martensitic stainless steel, which contains 0.7% carbon, 17% chromium and 1% molybdenum and can be used as kitchen knives and scissors. The microstructure and properties of the tested alloys after quenching at 980 - 1100 °C and low tempering were investigated by means of optical microscope (OM), scanning electron microscope (SEM), Rockwell hardness tester and impact tester. The results show that the microstructure consists of acicular martensite, carbides and a litter retained austenite after quenching and tempering. The carbides are mainly (Fe,Cr)23C6. The content of retained austenite increases with the increase of the quenching temperature. The solubility of carbon in martensite changes similarly. The martensite gets coarser as the quenching temperature increasing. The maximum value of hardness is 59 HRC, when the quenching temperature is 1060 °C. The impact toughness increases when the quenching temperature increases from 980 °C to 1080 °C and then decreases. The suitable heat treatment process for this alloy is quenching at 1060 °C~1080 °C for 30 min and then tempering at 200°C.

Mechanical Properties of Martensitic Stainless Steel (AISI420) Subjected to Conventional and Cryogenic Treatments

2020 ◽  
Vol 38 (8A) ◽  
pp. 1096-1105
Author(s):  
Hareer S. Mohamed ◽  
Ali H. Ataiwi ◽  
Jamal J. Dawood
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Retained Austenite ◽  
Martensitic Stainless Steel ◽  
Heat Treatments ◽  
Soaking Time ◽  
Hardness Values

Martensitic Stainless Steel (AISI420) MSS are vastly used because of their properties conventional which mix good mechanical and corrosion resistance. Cryogenic up to -196°C for different soaking time and heat treatments at (1000,500,200°C) for 15 minutes is one of the ways that used to enhance mechanical properties of these steels by means transformation of retained austenite, deformation regarding martensite then carbide refinement. the result showed an increase in tensile strength of samples that were treated cryogenically and tempered at 500°C was 933 (MPa) compared to samples that just treated conventionally in austenitizing and tempering at the same temperature that was 880 (MPa). The hardness values increased considerably to 414HV and 321 HV for the specimen that tempered at 200°C and 500°C respectively, precipitation of small carbides was observed that this is responsible for the improvement in the mechanical properties of the material.

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