Effect of Heat-Treatment on the Interface Microstructure of Explosively Welded Stainless Steel – Bronze Composite

2014 ◽  
Vol 698 ◽  
pp. 495-500 ◽  
Author(s):  
Iuliia N. Maliutina ◽  
Vyacheslav I. Mali ◽  
Ksenia A. Skorokhod ◽  
Anatoly A. Bataev
Keyword(s):  
Stainless Steel ◽  
Diffusion Layer ◽  
Weld Joint ◽  
Diffusion Processes ◽  
Iron Concentration ◽  
Mixing Zone ◽  
Structural Variations ◽  
Heat Treated ◽  
The Difference ◽  
Interface Mixing

Analysis of structural variations taking place at the stainless steel (09Cr18Ni10Ti) - bronze (CuBe2Ni) interface obtained by explosive welding was conducted in the current work. The produced weld joint was post heat-treated in the temperature range from 500 to 800 °С. Microstructural characterizations were carried out using optical and scanning electron microscopy. The results of the analysis revealed the presence of 2 zones at the interface: mixing zone of bronze and stainless steel and a diffusion zone. The diffusion processes in the weld joint during heating were studied by the energy-dispersive analysis (EDX). EDX studies revealed that at 800 °С copper contained in bronze completely migrated from the diffusion layer to the mixing zone whereas iron concentration, on the contrary, increased in the diffusion layer. Voids appeared in the mixing zone of stainless steel and bronze due to the difference of diffusion coefficients of basic elements in the composite.

scholarly journals Effect of Nitrogen on the Corrosion Behavior of Austenitic Stainless Steel in Chloride Solutions

2015 ◽  
Vol 9 (11) ◽  
pp. 119 ◽  
Author(s):  
W. A. Ghanem ◽  
W. A. Hussein ◽  
S. N. Saeed ◽  
S. M. Bader ◽  
R. M. Abou Shahba
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Localized Corrosion ◽  
Partial Replacement ◽  
General Corrosion ◽  
Heat Treated ◽  
The Difference

The effect of partial replacement of nickel with nitrogen on the corrosion resistance of newly designed austenitic stainless steel samples without and with heat treated was investigated in 3.5wt% and 5wt% NaCl solution using open-circuit, potentiodynamic, cyclic anodic polarization and electrochemical impedance spectroscopy techniques. The results showed that, passivation in sample 1 where the highest addition of nickel and low addition of nitrogen is different from that for sample 4 where the nitrogen is greatest and the nickel is reduced almost to the third comparing sample 1. The difference in responses of heat treated samples to localized and general corrosion could be attributed to the difference in their phase compositions. The appearance of ferrite phase for samples (2, 4, 5 and 6) after heat treatment resulted in lowering the general and localized corrosion resistance than as forged samples in contrast with samples 1 and 3, where they still pure austenite. The obtained results are confirmed by surface examination.

Structural variations in heat treated B-bearing stainless steel

2009 ◽  
Vol 30 (3) ◽  
pp. 885-891 ◽  
Author(s):  
Fu Han-guang ◽  
Li Zhen-hua ◽  
Lei Yong-ping ◽  
Jiang Zhi-qiang ◽  
Xing Jian-dong
Keyword(s):  
Stainless Steel ◽  
Structural Variations ◽  
Heat Treated

Diffusion Bonding of Sialon to AISI 420 Martensitic Stainless Steel with Cut Off Heat upon Cooling

2016 ◽  
Vol 1133 ◽  
pp. 249-253
Author(s):  
Nor Nurulhuda Md Ibrahim ◽  
Patthi Hussain ◽  
Mokhtar Awang
Keyword(s):  
Stainless Steel ◽  
Diffusion Layer ◽  
Reaction Layer ◽  
Diffusion Bonding ◽  
Martensitic Stainless Steel ◽  
Ferrite Matrix ◽  
Interface Layer ◽  
Uniaxial Pressure ◽  
Aisi 420 ◽  
The Difference

In the past years, not many works on joining sialon to martensitic stainless steel have been carried out. The effect of the cut off heat upon cooling on the joint has yet to be discussed. In this paper, this effect is studied in terms of the microstructure and hardness of the reaction layer. Diffusion bonding was utilized to join sialon and AISI 420 martensitic stainless steel. The joining processes were conducted at 1150°C and 1200°C for one hour under a uniaxial pressure of 17 MPa in a vacuum (i.e. 1.0x10-5Torr). The heat was cut off upon cooling and the samples were left in the furnace for about 20 hours to cool down. Thicker reaction layer was formed in 1200°C sample because interdiffusion and reaction of elements occurred more rapidly at this temperature. The cut off heat had caused the sialons to crack and it was very severe in 1150°C sample due to the formation of a very thin interface layer. This layer did not have the sufficient strength to bind sialon and steel together because one of the sialons was completely detached from the joint. Diffusion layer and parent steel were segregated due to the difference in properties between the regions and it was more noticeable in 1200°C sample. Iron silicides and aluminium oxide might be formed in the interface layer. Microstructure of the parent steel transformed from globular coarse carbide in ferrite matrix to large grain size with carbide’s precipitation along the grain boundaries. More precipitates were formed in 1200°C sample and they were concentrated near the segregation line of the diffusion layer and the parent steel. The weakest part of the joint was at the border of sialon and interface layer since their hardness were extremely different.

HPM 455

Alloy Digest ◽  
1997 ◽  
Vol 46 (1) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Martensitic Stainless Steel ◽  
Heat Treating ◽  
Good Combination ◽  
Heat Treated

Abstract HPM 455 is a precipitation hardenable martensitic stainless steel. The composition provides a good combination of corrosion resistance and heat-treated strength favorable for fatigue applications. The material is well suited for demanding spring devices. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-666. Producer or source: Hamilton Precision Metals Inc.

scholarly journals Scanning Accuracy of Bracket Features and Slot Base Angle in Different Bracket Materials by Four Intraoral Scanners: An In Vitro Study

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 365
Author(s):  
Seon-Hee Shin ◽  
Hyung-Seog Yu ◽  
Jung-Yul Cha ◽  
Jae-Sung Kwon ◽  
Chung-Ju Hwang
Keyword(s):  
Stainless Steel ◽  
In Vitro Study ◽  
Sem Images ◽  
Polycrystalline Alumina ◽  
Base Angle ◽  
Accurate Expression ◽  
Dental Model ◽  
Alumina Composite ◽  
The Difference

The accurate expression of bracket prescription is important for successful orthodontic treatment. The aim of this study was to evaluate the accuracy of digital scan images of brackets produced by four intraoral scanners (IOSs) when scanning the surface of the dental model attached with different bracket materials. Brackets made from stainless steel, polycrystalline alumina, composite, and composite/stainless steel slot were considered, which have been scanned from four different IOSs (Primescan, Trios, CS3600, and i500). SEM images were used as references. Each bracket axis was set in the reference scan image, and the axis was set identically by superimposing with the IOS image, and then only the brackets were divided and analyzed. One-way analysis of variance (ANOVA) was used to compare the differences. The difference between the manufacturer’s nominal torque and bracket slot base angle was 0.39 in SEM, 1.96 in Primescan, 2.04 in Trios, and 5.21 in CS3600 (p < 0.001). The parallelism, which is the difference between the upper and lower angles of the slot wall, was 0.48 in SEM, 7.00 in Primescan, 5.52 in Trios, 6.34 in CS3600, and 23.74 in i500 (p < 0.001). This study evaluated the accuracy of the bracket only, and it must be admitted that there is some error in recognizing slots through scanning in general.

Corrosion behavior of cold-rolled and post heat-treated 316L stainless steel in 0.9wt% NaCl solution

2021 ◽  
Vol 28 (3) ◽  
pp. 440-449
Author(s):  
K. Bin Tayyab ◽  
A. Farooq ◽  
A. Ahmed Alvi ◽  
A. Basit Nadeem ◽  
K. M. Deen
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
316L Stainless Steel ◽  
Nacl Solution ◽  
Heat Treated ◽  
Cold Rolled

scholarly journals The Effect of Co-Deposition of SiC Sub-Micron Particles and Heat Treatment on Wear Behaviour of Ni–P Coatings

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 180
Author(s):  
Donya Ahmadkhaniha ◽  
Lucia Lattanzi ◽  
Fabio Bonora ◽  
Annalisa Fortini ◽  
Mattia Merlin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Friction Coefficient ◽  
Wear Mechanisms ◽  
Composite Coatings ◽  
Wear Behaviour ◽  
Maximum Hardness ◽  
Sic Particles ◽  
Heat Treated ◽  
The Coefficient Of Friction ◽  
The Difference

The purpose of the study is to assess the influence of SiC particles and heat treatment on the wear behaviour of Ni–P coatings when in contact with a 100Cr6 steel. Addition of reinforcing particles and heat treatment are two common methods to increase Ni–P hardness. Ball-on-disc wear tests coupled with SEM investigations were used to compare as-plated and heat-treated coatings, both pure and composite ones, and to evaluate the wear mechanisms. In the as-plated coatings, the presence of SiC particles determined higher friction coefficient and wear rate than the pure Ni–P coatings, despite the limited increase in hardness, of about 15%. The effect of SiC particles was shown in combination with heat treatment. The maximum hardness in pure Ni–P coating was achieved by heating at 400 °C for 1 h while for composite coatings heating for 2 h at 360 °C was sufficient to obtain the maximum hardness. The difference between the friction coefficient of composite and pure coatings was disclosed by heating at 300 °C for 2 h. In other cases, the coefficient of friction (COF) stabilised at similar values. The wear mechanisms involved were mainly abrasion and tribo-oxidation, with the formation of lubricant Fe oxides produced at the counterpart.

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