Journal: Iranian Journal of Manufacturing Engineering

Publication date: 24 April 2021


Grinding burn is one of the most significant problems in grinding process with uncontrolled conditions and degrades the mechanical properties and performance of the part. The aim of the present study is to non-destructively evaluate the grinding burn phenomenon in steel parts. The parameters of the grinding process were changed to produce microstructural changes with different burn grades on the surface of steel parts. The results obtained from microscopic observations and micro-hardness tests revealed the occurrence of two types of burns including thermal softening (surface tempering) and re-hardening (formation of a hard white layer on the surface) burns. Read more

Journal: International Journal of Engineering

Publication date: 1 April 2021


The present paper shows the results of applying an artificial neural network to three non-destructive magnetic methods including magnetic hysteresis loop (MHL), eddy current (EC), and magnetic flux leakage (MFL) techniques to determine mechanical features of plain carbon steels with unknown carbon contents subjected to tempering treatment. Read more

Journal: Nondestructive Testing and Evaluation

Publication date: 04 Jun 2020


Based on relationships between electromagnetic properties and microstructural changes in steel, the current paper describes the development of an electromagnetic technique to determine steel hardenability, non-destructively. Performing Jominy end-quench test, magnetic hysteresis loop and eddy current methods have been applied to SAE 4140 standard steel samples to explore applicability of the non-destructive techniques for determining hardenability. Read more

Journal: Materials Engineering and Performance

Publication date: 26 March 2020


In this paper, combination of multiple regression method, logit model and discriminant analysis is proposed to extract underlying relationships among metallurgical characteristics of steel samples with different carbon contents subjected to various heat-treating cycles and magnetic properties. Read more

Journal: Nondestructive Testing and Evaluation

Publication date: 19 March 2020


The sensitivity of magnetic non-destructive methods to both chemical composition and microstructure has limited their potential application for determination of mechanical properties in plain carbon steels under conditions of varying carbon content and microstructure. Read more

Journal: Nondestructive Evaluation 

Publication date: 5 March 2020


The goal of the present study is to examine the applicability of non-destructive magnetic hysteresis loop technique and Hall effect sensor to characterize the strain induced α′-martensite in an austenitic stainless steel. Read more

Journal: Russian Journal of Nondestructive Testing

Publication date: 23 December 2019


A nondestructive eddy current method has been used to characterize microstructural features of Hadfield steels subjected to various conditions of heat treatment. The heat treatment parameters including quenching media (furnace, air, and water) and tempering temperatures (in the range of 200–600°C) were varied to obtain different microstructures. Read more

Journal: Journal of Magnetism and Magnetic Materials

Publication date: 2 December 2019


Variation in chemical composition is one the most important parameters that affects the microstructure and mechanical properties of powder metallurgical (PM) steel parts. Therefore, utilization of nondestructive methods to determine the chemical composition and microstructural/mechanical properties of a given PM steel sample could be a subject of importance. Read more

Journal: Surface & Coatings Technology

Publication date: 18 October 2019


The present paper aims to enhance the accuracy of surface hardness and case depth measurement of induction hardened steel parts using statistical modeling methods and electromagnetic nondestructive techniques. In this research, to create various hardened layers with different thicknesses, eight different conditions of induction hardening treatments have been performed on cylindrical AISI 1045 steel samples. Read more

Journal: Nondestructive Testing and Evaluation

Publication date: 05 Sep 2019


in this paper, a combination of non-destructive magnetic technique and artificial neural networks is introduced, firstly, to ensure that the heat treatment process applied to a given API X65 steel sample results in desired microstructure and mechanical properties and secondly, to determine thickness variation which may occurs as a result of corrosion effect. To evaluate the effects of microstructure/mechanical properties and thickness variations on magnetic parameters, the magnetic hysteresis loop method has been applied on API X65 steel specimens with the thicknesses of 1–4 mm, each subjected to four different heat-treating cycles (austenitised samples were cooled in furnace, air, oil and water). Read more