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Corrosion Properties of 34CrMo4 Steel Modified by Shot Peening Qiang Zheng , 1 Kejian Li , 1,2 Xueguo Yin , 1 Bingbing Li , 1 Chunhong Li , 1,2 Yilong Ma , 1 Jianchun Sun , 1 and Dengming Chen 1,2
Corrosion Properties of 34CrMo4 Steel Modified by Shot Peening. A passive film on SP surface was formed by nanocrystalline grains. However, the passive film formed in the initial stage was not dense or uniform, and cracks occurred in the passive film during peening, resulting in a decrease in corrosion resistance.
ResearchArticle Corrosion Properties of 34CrMo4 Steel Modified by Shot Peening QiangZheng,1 KejianLi,1,2 XueguoYin,1 BingbingLi,1 ChunhongLi,1,2 YilongMa,1 JianchunSun,1 andDengmingChen1,2
In this work, the microstructure and properties of 34CrMo4 alloy of before and after SP for 20 min have been investigated. The evolution of microstructure and properties were analyzed from the surface and cross-section. The microstructure morphology at the different depth was determined by optical microscope.
in corrosion resistance after sandblasting, shot peening and surface mechanical attrition treatment (SMA T). The reduction in corrosion resistance is related to the formation of a rough surface of the treated samples. Surface modifications produced by the shot peening treatment are increase roughening of the surface.
Though lots of studies on shot peening effects on fatigue properties of steel, aluminum and Ti alloy have been carried out, the influence on fatigue property of Cu alloy is rarely reported . Moreover, the conventional shot peening will increase the surface roughness due to the large diameter of the shot ball, which could be >0.5 mm.
cold working procedure, controlled shot peening, as a practical method of preventing both SCC and ICC. Firstly, shot peening imposes a compressive stress on the surface that can negate the tensile stresses, residual or applied, that are required for SCC. Secondly, shot peen- ing uniformly cold works the surface of the work piece;
A nanocrystalline layer was prepared on the surface of 34CrMo4 steel by time controlling shot peening (SP, i.e., 1, 5, 10, and 20 minutes).
Ferritic stainless steels are used in specific applications where corrosion resistance, oxidation resistance and a high mechanical resistance are required. Shot peening is a process applied to add residual compression stresses in metallic surfaces with the intent of improving the material when exposed to corrosion due to stress and fatigue.
This paper describes the testing of laser shock peening (LSP) on the corrosion resistance of a 316L stainless steel laser welded joint. The objective of this research is to explore the changes in corrosion resistance when a laser shocks weldments under the same laser line energy (50 J/mm).
Corrosion Properties of 34CrMo4 Steel Modified by Shot Peening In the majority modern appliances, this procedure is otherwise called ultrasonic peening (UP) [3-4]. Comparison between ultrasonic and laser shock peening treatment on fatigue life performance of Al-Alloy 7075
Corrosion Properties of 34CrMo4 Steel Modified by Shot Peening Scanning vibrating electrode technique (SVET) [8, 9] is to study the corrosion resistance of samples by detecting the local corrosion potential (current) information of samples without touching the surface of the sample.
Here, the martensites less than 10% were produced by shot peening at room temperature. Whether reading ink jet or dot peening, the device handles direct part marking (DPM) identification for traceability in production, logistics, pharmaceuticals and automotive. Dot peening also deformed metal parts and caused premature rust.
depth profile obtained can be used to select appropriate spring stock, as well as tailor forming, peening and heat treatment parameters to best suit the intended application. Controlled shot peening is regularly being specified by the aerospace, automotive and nuclear industries to enhance component service life.
It follows that shot-peening may be expected to improve only slightly the fatigue properties of highly polished components under push- pull stresses ; where component's are left with rough surfaces, peening should improve the endurance to fatigue of this kind to a greater extent. In the case of corrosion-fatigue, destruction always
Read "Hot corrosion behaviour of Ti6Al4V modified by ultrasonic shot peening, Materials & design" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Evaluation of Weldability and Mechanical Properties in Resistance Spot Welding of Ultrahigh-Strength TRIP1100 Steel The grains appear to contain microconstituents including martensite (most of the dark features in the HAZ) with allotriomorphic ferrite (shown with arrows) around the prior austenite grain boundaries (dotted line).
Alloy special steel Chemical composition of steel 34CrMo4 (1.7220), Standards of steel 34CrMo4 (1.7220) Mechanical Properties of steel 34CrMo4 (1.7220) Equivalent grades of steel 34CrMo4 (1.7220) steel 34CrMo4 (1.7220) Tensile Strength, Elongation, Proof strength , Hardness
Synonyms for peened in Free Thesaurus. Antonyms for peened. 3 words related to peen: hammerhead, part, portion. What are synonyms for peened?
The shot peening process enables the surface of a part or material to be modified by impacting it with tiny metal balls of steel. These shots form small indentations on the surface with enough force to sufficiently strengthen and relieve stress in the components.
fatigue strength etc. of metal components. But the basic shot peening process cannot be efficiently used for all the materials used for industrial applications. So, modifications in shot peening process are also going on, which can be applied for different material surfaces to improve the surface characteristics. Modified shot peening processes
Shot peening significantly reduces the grain size in the near-surface regions of this steel, thereby altering the diffusion characteristics of elements in the modified surface layer during high temperature exposure. This refined grain structure can alter surface-induced corrosion mechanisms of NF616 without changing its bulk properties.
This study aims to improve the corrosion properties of 34CrMo4 steel upon SP; the effect of peening time on corrosion resistance was investigated in the simulated environment of liquid under oil wells. In addition, a variety of methods were used to characterize and analyze the mechanism of corrosion resistance.
Stress corrosion cracking (SCC) is a progressive fracture mechanism in metals that is a result of the simultaneous interaction of a corrodent and a sustained tensile stress. Structural failure due to SCC is often sudden and unpredictable, occurring after as little as a few hours of exposure, or after months or even years of satisfactory service.
- Shot peening process has no evident effect on the value of yield stress and ultimate strength. - Large difference, however, can be observed for tensile characteristic, especially in the case of materials with physical yield point - 1.8159 steel and 30HGSA steel (figure 5).
After machining, the surface is modified by shot peening using following properties: steel ball (0.4 mm in diameter and hardness 250 HV), 100 mm nozzle-to-plate distance, and shot for 10 minutes. Our parameters are variations in pressure, ranging from 4 to 6 bar. The microstructure of the treated surface was analyzed after shot peening.
Corrosion Properties of 34CrMo4 Steel Modified by Shot Peening Caption: Figure 3: Euler angle EBSD patterns of the cross section of an Al 6061 particle in the cold-sprayed coating . Cold-Sprayed Metal Coatings with Nanostructure
Corrosion Properties of 34CrMo4 Steel Modified by Shot Peening Corrosion Properties of 34CrMo4 Steel Modified by Shot Peening. Shot Peening Effect on Fatigue Crack Repaired Weldments Shot Peening Effect on Fatigue Crack Repaired Weldments. High resolution low kV EBSD of heavily deformed and nanocrystalline Aluminiumcorrosion properties of 34crmo4 steel modified by shot peening
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