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Original scientific paper

The role of residual stress to hardening and cracking on quenched and tempered ARMOR steel welded joints

Yurianto ; Mechanical Engineering Department, Diponegoro University, Semarang, Indonesia
S. H. Suryo ; Mechanical Engineering Department, Diponegoro University, Semarang, Indonesia
Syaiful ; Mechanical Engineering Department, Diponegoro University, Semarang, Indonesia
Y. Umardani ; Mechanical Engineering Department, Diponegoro University, Semarang, Indonesia
P. Yanuar ; Mechanical Engineering Department. Semarang State Polytechnic, Semarang, Indonesia


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Abstract

The welded joint always leaves residual stress when welding is complete; this stress produces distortion and reduces the distance between of microstructures in the joint. The purpose of this study was to observe the pattern of residual stress before and after welding of Q900&T125 Steel and Q900&T175 Steel. The material used in this study is Hot Rolled Plate Steel 10 mm thick. The material cut into two parts. Both are heated at 900° C, held for 30 minutes, and cooled in water. The first and second specimens tempered at 125°C and 175°C, respectively, and produces Q900&T125 Steel and Q900&T175 Steel. Measure d and do, and the axial, normal and transverse residual stresses using neutron ray diffraction. The method used is to measure free stress and stress, and the axial, normal, and transverse residual stresses using neutron diffraction. The shrinkage always leads to the weld center which causes the weld joint curved by the solidifying weld metal surface. The pattern and direction of the three residual stresses concentrated at the weld center.

Keywords

armor steel; welded joints; heat treatment; residual stress; hardening

Hrčak ID:

246086

URI

https://hrcak.srce.hr/246086

Publication date:

4.1.2021.

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