scholarly journals Quenching Sensitivity of Al-Zn-Mg Alloy after Non-Isothermal Heat Treatment

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1595 ◽  
Author(s):  
Shuai Li ◽  
Honggang Dong ◽  
Xingxing Wang ◽  
Zhongying Liu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Grain Boundary ◽  
Mg Alloy ◽  
Air Cooling ◽  
Isothermal Heat Treatment ◽  
Boundary Precipitate ◽  
The Matrix ◽  
Mechanical Properties And Corrosion

Type Al-Zn-Mg alloy has a wide ranges of application in vehicles, but corrosion resistance and mechanical properties of this alloy after heat treatment or heat straightening limits its utilization. This paper investigates the effect of quenching condition during non-isothermal heat treatment on corrosion behavior and mechanical properties of Al-Zn-Mg alloy. The corrosion resistance of Al-Zn-Mg alloy decreases after non-isothermal heat treatment and the sample after air quenching has the lowest corrosion resistance, the specimens can get better corrosion resistance when suffered 5 min air cooling followed by water quenching process. The evolution of mechanical properties and corrosion resistance of heat-treated specimens is caused by the modification of distribution of precipitates at grain boundary and the microchemistry of precipitates at grain boundary, precipitate-free zones and the matrix.

Effects of Heat Treatment on Microstructure and Properties of Stainless Clad Plate

2016 ◽  
Vol 703 ◽  
pp. 61-64
Author(s):  
He Rong Jin ◽  
Xu Kun Yang ◽  
You Wei Cui ◽  
Ya Li Yi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Chromium Content ◽  
Base Layer ◽  
Air Cooling ◽  
Microstructure And Properties ◽  
Mechanical Properties And Corrosion ◽  
Strength And Plasticity ◽  
Application Requirements

The effect of heat treatment on microstructure and properties of Q345R/304 clad plate was studied. The microstructure of the base layer was analyzed by metallographic microscope and scanning electron microscope, and mechanical properties such as tensile, shear and impact were investigated after heat treatment. The chromium content in the compound interface was analyzed after heat treatment through spectrum analysis technology. The results show that heat treatment affects the mechanical properties and corrosion resistance of stainless clad plate significantly. After air cooling, the microstructure of the base layer consi+sts of ferrite and pearlite, the strength of clad plate is low, and the corrosion resistance is poor. After oil cooling to 450°Cand air cooling, the microstructure of the base layer consists of bainite, ferrite and a small amount of pearlite. The strength and plasticity of clad plate can meet the application requirements and the corrosion resistance is excellent as well.

scholarly journals Effect of Heat-treatment Parameters of Cast Iron GJS-X350NiMnCu7-3-2 on its Structure and Mechanical Properties

2017 ◽  
Vol 17 (1) ◽  
pp. 121-126 ◽  
Author(s):  
D. Medyński ◽  
A. Janus ◽  
S. Zaborski
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Cast Iron ◽  
High Hardness ◽  
Spheroidal Graphite ◽  
Air Cooling ◽  
Material Hardness ◽  
The Matrix ◽  
Lower Material

Abstract The paper presents influence of soaking parameters (temperature and time) on structure and mechanical properties of spheroidal graphite nickel-manganese-copper cast iron, containing: 7.2% Ni, 2.6% Mn and 2.4% Cu. Raw castings showed austenitic structure and relatively low hardness (150 HBW) guaranteeing their good machinability. Heat treatment consisted in soaking the castings within 400 to 600°C for 2 to 10 hours followed by air-cooling. In most cases, soaking caused changes in structure and, in consequence, an increase of hardness in comparison to raw castings. The highest hardness and tensile strength was obtained after soaking at 550°C for 6 hours. At the same time, decrease of the parameters related to plasticity of cast iron (elongation and impact strength) was observed. This resulted from the fact that, in these conditions, the largest fraction of fine-acicular ferrite with relatively high hardness (490 HV0.1) was created in the matrix. At lower temperatures and after shorter soaking times, hardness and tensile strength were lower because of smaller degree of austenite transformation. At higher temperatures and after longer soaking times, fine-dispersive ferrite was produced. That resulted in slightly lower material hardness.

scholarly journals Mechanical properties and corrosion resistance of Mg-RE cast alloys and their plasma electrolytic oxidation

2021 ◽  
Vol 2144 (1) ◽  
pp. 012010
Author(s):  
S V Zasypkin ◽  
A O Cheretaeva ◽  
M R Shafeev ◽  
D L Merson ◽  
M M Krishtal
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Plasma Electrolytic Oxidation ◽  
Electrolytic Oxidation ◽  
Cast Alloys ◽  
Mechanical Properties And Corrosion ◽  
Plasma Electrolytic ◽  
Cast Magnesium

Abstract The effect of heat treatment on the mechanical properties (hardness, plasticity, yield and tensile strength) and corrosion resistance of several cast magnesium alloys with additions of rare earth metals (Y, Nd and Gd), and their surface modification by plasma electrolytic oxidation (PEO) were investigated. It was found that the heat treatment of the alloys results information of Mg12YZn, Mg3Zn3Y2 and Mg24Y5 based LPSO-phases and causes an increase in hardness and tensile strength by 5-7 and 20-25%, respectively, but at the same time, corrosion resistance of the alloysdrops by 10-20 times. PEO of the alloys after heat treatment reduced the corrosion currents by 1-3 orders of magnitude without changing the corrosion potential.

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