Phase changes of the AISI 430 ferritic stainless steels after high-temperature gas nitriding and tempering heat treatment

Sung, J.H.; Kong, Jung Hyun; Yoo, D.K.; On, H. Y.; Lee, D.J.; Lee, H.W.

doi:10.1016/j.msea.2007.11.078

Cited by 60 publications

(21 citation statements)

References 6 publications

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“…There is correlation of increasing hardness with increasing of nitrogen contents of stainless steel after HTGN process [5,9]. The concentration of nitrogen atom in the surface at the same partial pressure is depend on the temperature.…”

Section: Resultsmentioning

confidence: 93%

“…These treatments not only improve the properties, but also it can modify the initial phase [2,3]. The research of HTGN treatment for AISI 430 has been conducted by many investigators [4,5]. Depending on the variable process, the micro structure of ferritic stainless steel AISI 430 can be modified into martensitic which hard or austenitic stainless steel which soft and non-magnetic.…”

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High Temperature Gas Nitriding Treatment of Aisi 430 Using Low and High Purity Nitrogen Gas

Suprihanto

2016

Rot.

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IntroductionOnes of materials which widely use in industry is stainless steel due high resistance to corrosion and appropriate mechanical properties. Stainless steel is ferrous alloys which contains at least 11% chromium. Depending on the phase in the microstructure, stainless steel can be grouped as austenitic, ferritic or martensitic.AISI 430 is the most widely produced ferritic stainless steel. AISI 430 is cheapest and fairly good corrosion resistance in a variety of environments. However in certain uses such as high corrosive environments, the mechanical properties and corrosion resistance are less fulfilling. In order to improve its properties, this stainless steel can be treated by high temperature gas nitriding (HTGN) treatment.HTGN treatment is able to enhance the properties of stainless steel such as strength, hardness, wear resistance and corrosion resistance [1]. These treatments not only improve the properties, but also it can modify the initial phase [2,3]. The research of HTGN treatment for AISI 430 has been conducted by many investigators [4,5]. Depending on the variable process, the micro structure of ferritic stainless steel AISI 430 can be modified into martensitic which hard or austenitic stainless steel which soft and non-magnetic.The basic process of HTGN is by exposing the stainless steel in high purity nitrogen gas atmosphere at temperature 1050 o C ± 50 o C within certain time prior quenching [6]. During the process, nitrogen gas become dissociate into two nitrogen atom prior diffuses into stainless steel.The effects HTGN treatment on the properties of stainless steel depends on the amounts of nitrogen atom which diffuse into stainless steel. The resulting effects depend on the process variable such as chemical composition of stainless steel, temperature process, nitrogen gas pressure and duration of holding time [1,6,7].Generally, the increasing strength obtained after treatment is not higher than increasing of its hardness due to the grain coarsening. Holding time for long duration produce excessive grain size. To overcome grain coarsening, some refinement methods have been developed [8]. The refinement methods promise the prospective application of HTGN treatment in industry.Despite HTGN treatment use high purity nitrogen gas, there are several grade of purity on the market. The highest purity and the most expensive grade is scientific or research grade which has minimum purity 99.9999%. The other grades are ultra high purity (UHP) grade (99.999%), zero grade (99.998%), specialized zero grade (99.998%), oxygen free grade (99.998%) and industrial/welding grade (99.5%). The grade purity of nitrogen gas depends on the percentage of moisture, oxygen, hydrocarbon, and CO x .The most widely available grade is industrial or welding grade. The industrial/welding grade promises in cost production reduction for HTGN treatment. However, the effect of nitrogen gas purity on the effect of HTGN treatment ABSTRACTThe properties of stainless steels can be improved by high temperature gas nitriding (HT...

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Section: Resultsmentioning

confidence: 93%

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confidence: 99%

High Temperature Gas Nitriding Treatment of Aisi 430 Using Low and High Purity Nitrogen Gas

Suprihanto

2016

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“…Ceci on ne l'observe que dans le cas de la nitruration des aciers inox contenants de grands pourcentages de chrome. Ou bien dans le cas de la nitruration à hautes températures [10]. D'après nos calculs la phase alpha peut précipiter le nitrure Cr2N dans les conditions où le pourcentage de chrome dépasse les 3 % mais cette précipitation reste faible (1.5%) (Figure 6) et devient plus abondante à 5 %Cr elle est autours de 6 % (figure 7).…”

Section: Interprétationsunclassified

Etude de la distribution des phases nitrures dans le cas de la nitruration du fe-cr

Benrabia

Djeghlal

Barralier

2009

XXXV JEEP – 35th Conference on Phase Equilibria

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“…Some of the most commonly used methods are DC plasma nitriding at low temperature [3][4][5][6][7] and ion implantation [8,9]. Recently, High-Temperature Gas Nitriding (HTGN) or solution nitriding has been introduced as a method for adding nitrogen to stainless steel [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…It was found that with 1.1 wt.% of nitrogen, the hardness of UNS S31813 increased from 270 to 390 HV. Sung et al [11] examined the phase changes, nitride precipitation, heat treatment, hardness variations, and tempering effect of AISI 430 ferritic stainless steel after HTGN at 1050…”

Section: Introductionmentioning

confidence: 99%

Solution heat treatment of plasma nitrided 15-5PH stainless steel - Part I: Improvement of the corrosion resistance

Borges¹,

Rocha²

2011

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The results of the investigation on Solution Heat Treatment of Plasma Nitrided (SHTPN) precipitation-hardened steel 15-5 PH are presented. The layers have been obtained by the plasma nitriding process followed by solution heat treatment at different temperatures. The influence of the solution heat treatment after nitriding on the dissolution process of the nitrided layer has been considered. The nitrided layers were studied by scanning electron microscopy, X-ray microanalysis (EDX), and X-ray diffraction. Micro-hardness tests of the nitrided layers and solubilized nitrided layers have been carried out and interpreted by considering the processing conditions. It was found that high nitrogen austenitic cases could be obtained after SHTPN of martensitic precipitation-hardened steel (15-5PH). When Solution Heat Treatment (SHT) was performed at 1100• C, some precipitates were observed. The amount of precipitates significantly reduced when the temperature increased. The EDX microanalysis indicated that the precipitate might be chromium niobium nitride. When the precipitation on the austenite phase occurred in small amount, the corrosion resistance increased in SHTPN specimens and the pit nucleation potential also increased. The best corrosion result occurred for SHT at 1200

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Phase changes of the AISI 430 ferritic stainless steels after high-temperature gas nitriding and tempering heat treatment

Cited by 60 publications

References 6 publications

High Temperature Gas Nitriding Treatment of Aisi 430 Using Low and High Purity Nitrogen Gas

High Temperature Gas Nitriding Treatment of Aisi 430 Using Low and High Purity Nitrogen Gas

Etude de la distribution des phases nitrures dans le cas de la nitruration du fe-cr

Solution heat treatment of plasma nitrided 15-5PH stainless steel - Part I: Improvement of the corrosion resistance

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