期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 261, 期 -, 页码 193-201出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2018.05.023
关键词
9%Ni steel; GTAW; Laser beam welding; Fusion zone size; Microstructure; Tensile strength; Impact absorbed energy
资金
- DLR Project Management Agency, Germany [01DH14012]
- DLR Project Management Agency, Egypt GERF [ID5111]
- Science and Technology Development Fund (STDF) of the Arab Republic of Egypt
- Federal Ministry of Education and Research (BMBF) of the Federal Republic of Germany
In comparison with GTA welded joints, higher tensile strength comparable to that of the base metal was obtained for laser beam welded joints due to fine martensitic microstructure. Impact fracture toughness values with much lower mismatching were obtained for laser beam welded joints due to similarity in the microstructures of its weld metal and HAZ. In this case, the lower impact fracture toughness obtained (1.37 J/mm(2)) was much higher than that of the GTA welded joints (0.78 J/mm(2)), which was very close to the specified minimum value ( 0.75 J/mm(2)). In contrast to other research works, the overall tensile and impact properties are influenced not only by the fusion zone microstructure but also by the size of its hardened area as well as the degree of its mechanical mismatching, as a function of the welding process. A better combination of tensile strength and impact toughness of the concerned steel welded joints is assured by autogenous laser beam welding process.
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