The Effects of heat treatment on microstructure, hardness and fatigue behavior of (AMS5659) 15-5 precipitation hardenable stainless steel

Download

index.pdf

Date

2018

Author

Gören, Şahin

Metadata

Show full item record

Item Usage Stats

512
views

236
downloads

In this study, effects of heat treatment parameters on microstructure, hardness and fatigue behavior of 15-5 precipitation hardenable stainless steels have been examined. Heat treatments have been conducted in three different steps homogenization, solutionizing and aging treatment at different temperatures and times. Microstructural analysis in terms of grain size and chemical composition analysis have been performed by optical and scanning electron microscope (SEM). Then, hardness measurements were applied for all heat treated specimens. Fatigue tests have been conducted at negative stress ratio (R) equal to -1 under constant amplitude cyclic loading for selected group of heat treated specimens. Fatigue test results have been evaluated according to AGARD-AG-292 and ISO 12107 standards in order to see the effect of heat treatment parameters on fatigue limit of the 15-5 precipitation hardenable stainless steels. Fatigue limit was determined as stress level at 107 cycles on stress vs. cycle (S-N) curve. It was also calculated by using staircase method in order to verify the fatigue limit that was found as stress level at 107 cycles on S-N curve. Higher hardness and fatigue limit were achieved for aging treatment at 4800C for 1h and 4000C for 70h compared to aging treatment at 5500C for 4h. The measurements and test results show that by changing heat treatment parameters, hardness and fatigue limit of 15-5 precipitation hardenable stainless steel can be increased.

Subject Keywords

Stainless steel., Metals, Precipitation hardening., Stainless steel, Stainless steel

URI

http://etd.lib.metu.edu.tr/upload/12622810/index.pdf
https://hdl.handle.net/11511/27830

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Dynamic strain aging of dual phase steels in forming applications Bayramin, Berkay; Efe, Mert; Department of Metallurgical and Materials Engineering (2017) Sheet metals are subjected to certain temperatures (25-200oC) and strain rates (1-10 s-1) during forming applications. These thermomechanical conditions may cause dynamic strain aging (DSA) in various grades of steels including dual phase (DP) steels. DSA represent itself as serrations in the stress-strain curves. Two grades of DP steels (DP590 and DP800) were studied systematically at different strain rates (10-3s-1-1s-1) and temperatures (25oC-400oC) to investigate the DSA effects on the mechanical proper...
Kinetics and microstructural analysis of fatigue fracture progress in weld joints of duplex stainless steel grade 2205 Yurtışık, Koray; Gürbüz, Rıza; Department of Metallurgical and Materials Engineering (2013) Despite its high efficiency, autogenous keyhole welding technique leads to an excessive δ-ferrite formation in as-welded duplex stainless steels that leads to deterioration of the corrosion properties of the material, as well as its toughness. Developing the hybrid plasma-gas metal arc welding procedure for duplex stainless steels, a narrow gap and single-pass weldment on 11 mm-thick duplex stainless steel (grade 2205) plates has been achieved. Contrary to other keyhole techniques, such as Laser beam weldin...
Effects of heat treatment and chemical composition on microstructure and mechanical properties of hadfield steels Alyaz, Serhat; Gür, Cemil Hakan; Department of Metallurgical and Materials Engineering (2003) The aim of this thesis is to investigate the effects of Mn content and alloying additions such as Cr and Mo, and various heat treatment procedures on both microstructure and mechanical properties of austenitic manganese (Hadfield) steels. For this purpose, steels with two different Mn content were considered (12-14 Mn, 16-18 Mn). First, five different heat treatment procedures were applied to the as-cast 12-14 Mn specimens to decide the procedure resulting the optimum tensile properties. Then, the specimens...
The effect of SN content and isothermal transformation temperature on the mechanical properties of austempered ductile cast iron Özcan, Alper; Atala, Haluk; Department of Metallurgical and Materials Engineering (2003) In this study the effects of Sn content and isothermal transformation temperature on the ultimate tensile strength (UTS), elongation and hardness of austempered ductile cast iron (ADI) was investigated. To determine the possible effect of Sn on these properties the Sn content of standard GGG30, GGG40 and GGG50 materials were taken as reference, whose chemical compositions vary from 0,016 to 0,050% in terms of Sn. However the Sn content was increased to a maximum of 0,26% for investigating the effect of Sn o...
Effects of Graphene Transfer and Thermal Annealing on Anticorrosive Properties of Stainless Steel Oh, Jeong Hyeon; Han, Sangmok; Kim, Tae-Yoon; PARK, JONGEE; Öztürk, Abdullah; Kim, Soo Young (2017-11-01) Stainless steel (STS) films were annealed in a thermal quartz tube and covered with graphene to improve their anticorrosive properties. Graphene was synthesized via the chemical vapor deposition method and transferred onto the surface of the STS film by the layer-by-layer approach. The structure of the STS film changed from alpha-Fe to gamma-Fe after annealing at 700 C for 1 h, resulting in an increase of 82.72% in the inhibition efficiency. However, one-layer graphene acted as a conductive pathway and ther...

Citation Formats

Ş. Gören, “The Effects of heat treatment on microstructure, hardness and fatigue behavior of (AMS5659) 15-5 precipitation hardenable stainless steel,” M.S. - Master of Science, Middle East Technical University, 2018.