A novel rare earth-salt bath nitriding of TC21-DT titanium alloy

2016 ◽  
Vol 34 (2) ◽  
pp. 128-131 ◽  
Author(s):  
Y. S. Zhu ◽  
W. Z. Lu ◽  
D. W. Zuo ◽  
D. W. Cao
Keyword(s):  
Titanium Alloy ◽  
Rare Earth ◽  
Salt Bath ◽  
Salt Bath Nitriding

scholarly journals EFFECT OF SALT BATH NITRIDING TIME ON THE PERFORMANCES OF 304 STAINLESS STEEL

2020 ◽  
Vol 26 (1) ◽  
pp. 4-6
Author(s):  
Xiliang LIU ◽  
Changjun MAO ◽  
Meihong WU ◽  
Wei CAI ◽  
Mingyang DAI ◽  
...  
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Salt Bath ◽  
304 Stainless Steel ◽  
Micro Hardness ◽  
Untreated Sample ◽  
Nitriding Time ◽  
Optimal Duration ◽  
Salt Bath Nitriding

In this study, salt bath nitriding was carried out at 565℃ for various times for 304 stainless steel (304SS). The effect of salt bath nitriding time on the microstructure, micro-hardness and wear resistance was investigated systematically. The results showed a nitriding layer was formed during salt bath nitriding, and the thickness of effective hardening layer is duration dependant. The maximum microhardness value of 1200HV0.01 was obtained at optimal duration of 150min, which was five times higher than that of the untreated sample. And the wear resistance could be significantly improved by salt bath nitriding, the lowest weight loss after wear resistance was obtained while nitriding for 150min, which was one tenth of that of untreated sample.

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>

scholarly journals Effect of Oxide Particles Formed through Addition of Rare-Earth Metal on Mechanical Properties of Biomedical β-Type Titanium Alloy

2013 ◽  
Vol 54 (8) ◽  
pp. 1361-1367 ◽  
Author(s):  
Junko Hieda ◽  
Mitsuo Niinomi ◽  
Masaaki Nakai ◽  
Ken Cho ◽  
Shigeki Nagai
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Oxide Particles

Troubleshooting

2003 ◽  
pp. 185-191
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Salt Bath ◽  
Heat Treatment Process ◽  
Ion Nitriding ◽  
Gas Nitriding ◽  
Salt Bath Nitriding

Abstract Problems often occur during nitriding, just as with any other heat-treatment process. They can take the form of process problems, steel problems, and machining problems. Troubleshooting is a process of elimination and plain detective work. One must be both observant and systematic during the troubleshooting procedure. This chapter discusses the procedure for troubleshooting problems with gas nitriding, salt bath nitriding, and ion nitriding.

scholarly journals Preparation of ε-Fe(Si)3N Powder Using a Salt Bath Nitriding Reaction and a Study on the Soft Magnetic Properties of the Powder

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 228
Author(s):  
Yuhua Xu ◽  
Zhenghou Zhu ◽  
Hui Zhao ◽  
Jia Zhou
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependence ◽  
Saturation Magnetization ◽  
Salt Bath ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Temperature Range ◽  
Nitriding Reaction ◽  
Salt Bath Nitriding ◽  
Fesi Alloy

In this paper, a single phase ε-Fe(Si)3N powder was successfully synthesized through the salt bath nitriding reaction method. The flaky FeSi alloy powder was used as the iron source, and non-toxic CO(NH2)2 was used as the nitrogen source. The nitridation mechanism, the preparation technology, the soft magnetic properties, and the magnetization temperature dependence of the powder were studied. The research result showed that ε-Fe(Si)3N alloy powders were synthesized in a high temperature nitrification system after the surface of flaky FeSi alloy powders were activated by a high-energy ball mill. The optimum nitriding process was nitridation for 1 h at 550 °C. The ε-Fe(Si)3N powder had good thermal stability at less than 478.8 °C. It was shown that ε-Fe(Si)3N powder has good soft magnetic properties, and the saturation magnetization of the powder was up to 139 emu/g. The saturation magnetization of ε-Fe(Si)3N powder remains basically constant in the temperature range of 300–400 K. In the temperature range of 400–600 K, the saturation magnetization decreases slightly with the increase of temperature, indicating that the magnetic ε-Fe(Si)3N powder has good magnetization temperature dependence.

Effect of QPQ Salt Bath Oxidation on Corrosion Resistance

2006 ◽  
Vol 118 ◽  
pp. 209-214
Author(s):  
Yuan Hui Li ◽  
De Fu Luo ◽  
Shao Xu Wu
Keyword(s):  
Corrosion Resistance ◽  
Water Solution ◽  
Salt Spray ◽  
Complex Salt ◽  
Salt Bath ◽  
Neutral Solution ◽  
High Corrosion Resistance ◽  
Salt Bath Nitriding ◽  
Porous Area ◽  
Magnetite Film

The QPQ complex salt bath treatment is a type of surface technology which contains mainly salt bath nitriding and post-oxidizing processes. The effect of QPQ oxidizing temperature and duration on the corrosion resistance of QPQ treated specimens has been explored by immersion tests and salt spray tests in this paper. All the specimens were post-oxidized after being nitrided at 570! for 2 hours. The material used in this study were 1020 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 5% NaCl neutral solution. From the experimental data, for high corrosion resistance, conclusions can be drawn:(1) appropriate temperature should be selected carefully in post-oxidizing stage .Too low or too high temperature would decrease the corrosion resistance. (2) The best post-oxidizing duration should generate magnetite film in porous area and should not collapse. (3) In second oxidizing stage, the porous area has been partly eliminated, so the duration should be less than the duration of post-oxidizing.

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 Rare Earth Catalysis in the Boriding Process to Titanium Alloy

2011 ◽  
Vol 48-49 ◽  
pp. 1177-1181
Author(s):  
Feng Hua Li ◽  
Xiao Hong Yi ◽  
Jing Lei Zhang ◽  
Zhan Guo Fan
Keyword(s):  
Titanium Alloy ◽  
Surface Layer ◽  
Rare Earth ◽  
Phase Composition ◽  
Diffusion Layer ◽  
Alloy Surface ◽  
Tc4 Titanium Alloy ◽  
Boriding Process

Solid powder boriding experiment was carried out on TC4 titanium alloy surface with method of RE(rare earth)-boriding at the temperature of over 1000°C. By means of XRD, SEM and EDS, phase composition, microstructure and morphology of TC4 titanium alloy after RE-boriding were investigated. The effect of rare earth on phase composition was discussed. Results of the experiment showed that the diffusion layer was composed of top-layer TiB2 and sub-layer TiB whiskers with the highest thickness being 25μm. The XRD results revealed TiB-TiB2 biphasic B-Ti compounds layer formed on the surface of TC4 after RE-boriding. The high content of B and Ce in the surface layer showed rare earth increased the absorption and concentration of B atoms.

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