Investigation on Effects of Joints Design Geometry on the Weld Metal Metallurgical Transformations and Fracture Modes in the ASTM A-128 Hadfield Steel Welding Joints

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SABZI M.; Kalantaripour R.; MONSHI A.

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Journal: JOURNAL OF MECHANICAL ENGINEERING Year:2020 | Volume:49 | Issue:4 (89) Page(s): 77-85

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Title

Investigation on Effects of Joints Design Geometry on the Weld Metal Metallurgical Transformations and Fracture Modes in the ASTM A-128 Hadfield Steel Welding Joints

Author(s)

SABZI M. | Kalantaripour R. | MONSHI A. | Issue Writer Certificate

Keywords

Hadfield steel

fracture mode

welding joints

weld metal

microstructure

Abstract

In this study, effects of joints design geometry on the weld metal metallurgical transformations and fracture mode in the Hadfield steel welding joints were investigated. For this purpose, initially 4 austenitized sheets with thickness 2 mm were prepared from Hadfield steel. Then joints design with two chamfered V and X forms were prepared and SMAW process was used for welding. The joints mechanical properties were examined by uniaxial tensile machine, charpy impact test and microhardness measuring test. The evaluation of the microstructures of weld metal in welding joints were conducted by optical microscopy and the fracture modes were determined by scanning electron microscopy examination. The results indicated that with using joints design containing chamfered V-shape in comparison with joints design containing chamfered X-shape in the Hadfield steel welded joints, resulted microstructures consisted from smaller grains and more carbide precipitates. Thus higher microhardness and higher yield and tensile strengths were observed. But impact energy and fracture strain was reduced. Also, scanning electron microscopy images indicated the occurrence of ductile fractures in both joints prepared with X and V-shaped chamfered. However as clearly was visible in scanning electron microscopy images, using joints design containing X-shaped chamfered in comparison with joints design containing V-shaped chamfered led to occurrence of more ductile fractures in the Hadfield steel weld joints.

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APA: Copy

SABZI, M., Kalantaripour, R., & MONSHI, A.. (2020). Investigation on Effects of Joints Design Geometry on the Weld Metal Metallurgical Transformations and Fracture Modes in the ASTM A-128 Hadfield Steel Welding Joints. JOURNAL OF MECHANICAL ENGINEERING, 49(4 (89) ), 77-85. SID. https://sid.ir/paper/269897/en

Vancouver: Copy

SABZI M., Kalantaripour R., MONSHI A.. Investigation on Effects of Joints Design Geometry on the Weld Metal Metallurgical Transformations and Fracture Modes in the ASTM A-128 Hadfield Steel Welding Joints. JOURNAL OF MECHANICAL ENGINEERING[Internet]. 2020;49(4 (89) ):77-85. Available from: https://sid.ir/paper/269897/en

IEEE: Copy

M. SABZI, R. Kalantaripour, and A. MONSHI, “Investigation on Effects of Joints Design Geometry on the Weld Metal Metallurgical Transformations and Fracture Modes in the ASTM A-128 Hadfield Steel Welding Joints,” JOURNAL OF MECHANICAL ENGINEERING, vol. 49, no. 4 (89) , pp. 77–85, 2020, [Online]. Available: https://sid.ir/paper/269897/en

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