Peranan Proses Intercritical Annealing Terhadap Ketidakmunculan Luluh Tak Kontinu pada Baja Berfasa Ganda  

Oleh:

Basoeki, Prita Dewi

Jenis: Article from Journal - ilmiah nasional - tidak terakreditasi DIKTI - atma jaya
Dalam koleksi: Cylinder: Jurnal Ilmiah Teknik Mesin vol. 1 no. 1 (Oct. 2008), page 3-8.
Topik: Dual Phase Steel; Intercritical Annealing; Micro Structure; Discontinuous Yielding; Strain Aging
Fulltext: Cylinder 2008 - Prita Dewi Basoeki - text optim.pdf (1.24MB)

Isi artikel

The current intercritical annealing process applied on ordinary commercial C-Mn steel has successfully increased its yield-strength, ffy, from 405 MPa to 807 MPa, and its tensile strength, <7U, from 523 MPa to be 1007 MPa, with insignificantly altered the uniform elongation, eu. The impact strength at room temperature increases from 2.850 J/mm2 to 3.587 J/mm" on the longitudinal direction and from 1.625 J/mm2 to 3.612 J/mm2 on the transversal direction. Other important result from this research work, the intercritical annealing also has successfully eliminated "discontinuous yielding" the unwanted metallurgical phenomenon during metal forming process upon automotive body production. Experimentally, this research work proved disappearance of the discontinuous yielding was due to a residual stress and high dislocation density built up within Ferrite grains. Reappearance of the discontinuous yielding is calculated to be 31 years, therefore, application of Dual Phase Steel produced by intercritical annealing is free from strain aging phenomena for a normal automotive life time.

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