MICROSTRUCTURE CHARACTERIZATION OF( Ni-PAL2O3) ELECTROLESS COATING OF LOW ALLOY STEEL (AISI 4140)

Abstract The influence of surface heat treatment using laser radiation on the fatigue strength and corresponding microstructural evolution of AISI 4140 alloy steel was investigated in this research. The AISI 4140 alloy steel was radiated by a diode laser to give surface temperatures in the range between 600 and 800°C, and subsequently underwent vibration peening. The fatigue behavior of surface-treated specimens was examined using a giga-cycle ultrasonic fatigue test, and it was compared with that of non-treated and only-peened specimens. Fatigue fractured surfaces and microstructural evolution with respect to the laser treatment temperatures were investigated using an optical microscope. Hardness distribution was measured using Vickers micro-hardness. Higher laser temperature resulted in higher fatigue strength, attributed to the phase transformation.

Download Full-text

Microstructure and mechanical characterization of high strength low alloy steel welded joint by hybrid laser arc welding

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/758/1/012045 ◽

2020 ◽

Vol 758 ◽

pp. 012045 ◽

Cited By ~ 1

Author(s):

Liang Liang Bao ◽

Yong Wang ◽

Tao Han

Keyword(s):

Alloy Steel ◽

Arc Welding ◽

Mechanical Characterization ◽

Welded Joint ◽

High Strength ◽

Low Alloy Steel ◽

Hybrid Laser Arc Welding

Download Full-text

Microstructure characterization and its relationship with impact toughness of C–Mn and high strength low alloy steel weld metals – a review

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2020.12.006 ◽

2021 ◽

Vol 10 ◽

pp. 471-501

Author(s):

J.C.F. Jorge ◽

L.F.G.de Souza ◽

M.C. Mendes ◽

I.S. Bott ◽

L.S. Araújo ◽

...

Keyword(s):

Impact Toughness ◽

Alloy Steel ◽

High Strength ◽

Microstructure Characterization ◽

Steel Weld ◽

Low Alloy Steel ◽

Weld Metals

Download Full-text

ANALYSIS AND MICROHARDNESS PROFILE OF HOT DIPPING COATING ON LOW-ALLOY STEEL

Surface Review and Letters ◽

10.1142/s0218625x20500596 ◽

2020 ◽

pp. 2050059

Author(s):

ABEER SHEHAB ◽

ATHIL AL-EZZI ◽

ALI AL KATAWY

Keyword(s):

Alloy Steel ◽

Steel Surface ◽

Zinc Coating ◽

Hardness Profile ◽

Low Alloy Steel ◽

Zinc Bath ◽

Pure Zinc ◽

Microhardness Profile ◽

Steel Aisi ◽

Dipping Process

This research is an effort to understand the morphology of the coating produced during hot dipping process in pure zinc bath based on iron–zinc phase diagram. In this investigation, zinc coating on low-alloy steel AISI 4340 samples was applied by hot dipping method followed by an annealing process. Morphological characterizations of the steel surface layer were accomplished by optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectrometry (EDS). Results revealed that the coating is bonded to the steel surface through a sequence of Fe–Zn layers namely alpha ([Formula: see text], delta ([Formula: see text] and zeta ([Formula: see text] with uniform sloping hardness profile.

Download Full-text