Amount of retained austenite at room temperature after reverse transformation of martensite to austenite in an Fe–13%Cr–7%Ni–3%Si martensitic stainless steel

2001 ◽  
Vol 45 (7) ◽  
pp. 767-772 ◽  
Author(s):  
Dong-Seok Leem ◽  
Yong-Deuk Lee ◽  
Joong-Hwan Jun ◽  
Chong-Sool Choi
Keyword(s):  
Stainless Steel ◽  
Retained Austenite ◽  
Room Temperature ◽  
Martensitic Stainless Steel ◽  
Reverse Transformation

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.

Fatigue Crack Growth in a Precipitation-Hardened Martensitic Stainless Steel: Influence of Ageing, Temperature and Loading History

2014 ◽  
Vol 891-892 ◽  
pp. 961-966
Author(s):  
Loic Dimithe Aboumou ◽  
Gilbert Hénaff ◽  
Mandana Arzaghi ◽  
Sylvie Pommier
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Room Temperature ◽  
Martensitic Stainless Steel ◽  
Load Ratio ◽  
Fatigue Crack Growth Resistance ◽  
Variable Amplitude

The 15-5PH (precipitation-hardened) martensitic stainless steel is prone to embrittlement following ageing during service at temperatures between 300°C and 350°C. This results in an increase in strength and a decrease in elongation and fracture toughness. However little information is available on the consequences of long term ageing on fatigue crack growth resistance. In the present study this issue is precisely addressed at room temperature and 300°C, with different load ratio under constant amplitude loading and under variable amplitude loading.At room temperature, the results indicate a marginal effect of the load ratio, regardless of ageing conditions and temperature. While the Paris regime is not affected by ageing, a significant drop in the critical stress intensity value before unstable fracture is observed, reflecting a decrease in fracture toughness of the material with ageing. At 300°C, the FCGRs are higher than at room temperature for all ageing conditions. Variable amplitude loading tests carried out on differently-aged materials showed the same retardation effect.

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