Effects of Ultrasonic Nano-Crystal Surface Modification on the Microstructure and Properties of 304 Austenitic Stainless Steel

2014 ◽  
Author(s):  
Chang Ye ◽  
Abhishek Telang ◽  
Amrinder S. Gill ◽  
Sergey Suslov ◽  
Zhong Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Surface Modification ◽  
Austenitic Stainless Steel ◽  
Crystal Surface ◽  
Processing Technique ◽  
304 Austenitic Stainless Steel ◽  
And Performance ◽  
Austenitic Stainless Steel 304 ◽  
Nano Crystal

In this study, the effects of Ultrasonic Nano-crystal Surface Modification (UNSM) on the microstructure changes and the mechanical properties of austenitic stainless steel 304 were studied. Due to the dynamic impacts induced by the multiple strikes during UNSM, surface nanocrystallization and transformation to martensite has been achieved. The work-hardened surface layers (3.5 times the original hardness) lead to significant improvement in the mechanical properties as measured by nano-indentation and tensile test. The results demonstrate that UNSM is a powerful surface processing technique that can improve component mechanical properties and performance.

Analysis on the Structure and Performance of Austenitic Stainless Steel Cladding Layer

2014 ◽  
Vol 687-691 ◽  
pp. 4214-4217
Author(s):  
Xiao Ding ◽  
Zhi Ling Wang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Transition Layer ◽  
Bending Test ◽  
Micro Hardness ◽  
Welding Wire ◽  
Corrosion Resistant ◽  
And Performance ◽  
Resistant Layer

MIG welding overlaid austenitic stainless steel on low alloy Q345B. The overlay cladding comprises a transition layer and corrosion resistant layer. Overlaying specimens of transition layer with different thicknesses were prepared. The mechanical properties of joints were tested by micro-hardness, bending test and other methods. The results showed that the mechanical properties of specimen with ER309L welding wire as transition layer did not have splitting phenomena after being bended. There were no cracks. However, the specimen without transition layer had small crack or tiny cracks. When the transition layer thickness is changed, the performance of overlay cladding is essentially unchanged. The organizations of overlay cladding in four groups of specimens are similar, which are composed of austenite and ferrite, and ferrite was mostly distributed in strips and blocks.

scholarly journals Effect of drawing and annealing on the microstructure and mechanical properties of 304 austenitic stainless steel wire

2021 ◽  
Author(s):  
Qinhua Xu ◽  
Jianxin Zhu ◽  
Yong Zong ◽  
Lihua Liu ◽  
Xiaoyong Zhu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Steel Wire ◽  
Stacking Fault ◽  
Stainless Steel Wire ◽  
Electron Backscattered Diffraction ◽  
Microstructure And Mechanical Properties ◽  
304 Austenitic Stainless Steel

Abstract Plastic deformation at room temperature, and the proceeding heat treatments, are important processes for optimizing the microstructure and mechanical properties of austenitic stainless steel. The microstructure and mechanical properties of cold-drawn 304 austenitic stainless steel wire were investigated after annealing at 700 and 800 °C, with different times (20, 40 and 60 min) and drawing strain (0.4, 1.0 and 1.5). Electron backscattered diffraction (EBSD) techniques, trans-mission electron microscope (TEM) analysis, differential scanning calorimeter (DSC) and tensile tests were performed in order to study the microstructure evolution and mechanical properties during different annealing processes for the 304 austenitic stainless steel wire. The results showed that the quantity of α’ martensite and dislocations increased with an increase in the strain, which means that, while the ultimate tensile strength of the cold-drawn wires elevated, the elongation reduced. The mechanical properties of stainless steel wires also varied with the evolution of martensite transformation characteristics, density of stacking fault, dislocation and twin, as well as the recrystallization degree under various annealing conditions. The recrystalli-zation temperature of steel wire was mainly determined by the magnitude of the strain, while the martensite reversal temperature was determined by the stacking fault energy and the de-formation value. The temperature of recrystallization and martensite reverse in steel wire de-creased with the increment of the strain. The balance of tensile strength and elongation of steel wire can be obtained by adopting the proper annealing process combined with cold-drawing deformation. In this paper, we showed that a good combination of strength and elongation in 304 austenitic stainless steel can be obtained with a strain of 1.5 annealed at 800 °C for 20 min.

Thermo-Induced Regression of Microstructure of Laser-Shocked Surface Modification of 304 Austenitic Stainless Steel

2013 ◽  
Vol 40 (2) ◽  
pp. 0203006
Author(s):  
罗新民 Luo Xinmin ◽  
韩光田 Han Guangtian ◽  
杨坤 Yang Kun ◽  
陈康敏 Chen Kangmin ◽  
张永康 Zhang Yongkang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Austenitic Stainless Steel ◽  
304 Austenitic Stainless Steel
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