High strength low alloy (HSLA) yang diaplikasikan menjadi baja tahan cuaca merupakan terobosan terbaru untuk menghasilkan sifat mekanik dan ketahanan korosi tinggi. Modifikasi Baja Laterit dengan penambahan kadar nikel diterapkan proses termomekanikal (TMCP) berupa kombinasi penempaan panas perlakuan fokusan penelitian ini. Sampel digunakan A-588 hasil investment casting telah ditambahkan sebes...

Cold stretch-formability and stretch-flangeability of 0.2%C-1.5%Si-5.0%Mn (in mass%) martensite-type medium Mn steel were investigated for automotive applications. High obtained in the subjected to an isothermal transformation process at temperatures between Ms Mf − 100 °C. Both formabilities decreased compared with those 0.2%C-1.5%Si-1.5Mn -3Mn steels (equivalent TRIP-aided martensitic steels)...

In the first part of the present study, two steels were designed with the aim of achieving properties consistent with the specifications for the manufacture of seamless pipes. The alloys were intended to develop into mixtures of bainitic ferrite and carbon enriched retained austenite during cooling to ambient temperature from the pipe forming operations, thus avoiding the need for subsequent he...

Fatigue of metals is a subject of practical importance because many components and structures in service are subjected to varying loads and although the average stresses are often low, local concentration of stresses do not reduce the static strength but often lead to failure by fatigue. Micro-crack formation due to fatigue is more in ferritic-pearlitic annealed steel rather than in hardened an...

The microstructure obtained as the weld cools from the liquid phase to ambient temperature is called the as–deposited or primary microstructure. Its major components include allotriomorphic ferrite, Widmanstätten ferrite, and acicular ferrite (Fig. 1). There may also be some martensite, retained austenite or degenerate pearlite. These latter phases occur in very small fractions, and are known b...

Carbide-free bainitic (CFB) steels with a matrix of ferrite and thin layers retained austenite, to reduce the manufacturing costs, usually do not contain alloying elements. However, few reports were presented regarding effect elements on properties these steels. Thus, this study evaluates effects vanadium rare earth (Ce-La) microalloying structure, phase transformation kinetics, mechanical carb...

Metallographic, micro-X-ray spectral and X-ray structural analyses have been carried out. The quenching temperature increase from 900 to 1150 °C leads high abrasive wear resistance in Ni-hard chromium-nickel cast iron. initial hardness decreased before the test 60 35 HRC due fact that phase composition of metal base changes during medium-carbon martensite with secondary cementite retained metas...

Casting infiltration technology was used to fabricate a high-chromium coating on the surface of parent ZG45 steel with different Ni content. SEM, EDS analysis, CALPHAD-type calculations, Rockwell hardness test and impact wear were utilized investigate influence microstructure, resistance performance. The as-cast microstructure casting coatings content less than 2.82 wt.% pearlite matrix reticul...

Cryogenic treatment (CT) is the supplementary process to conventional heat treatment process in steels, by deep–freezing materials at cryogenic temperatures to enhance the mechanical and physical properties of materials being treated. Cryogenic treatment (CT) of materials has shown significant improvement in their properties .Various advantages like increase in hardness, increase in wear resist...