To modify the rapid carburization and heat treatments of 18Cr2Ni4WA heavy-duty gears on coal-cutting machines, numerical modeling experimental investigations are carried out for understanding evolution microstructure properties. Through modeling, fractions austenite, bainite, martensite evaluated. The Vickers hardness distribution across hardening layer, calculated by Maynier equation, compares...

Nanostructured bainite is a novel ultra-high-strength steel-concept under intensive current research, in which the optimization of its mechanical properties can only come from a clear understanding of the parameters that control its ductility. This work reviews first the nature of this composite-like material as a product of heat treatment conditions. Subsequently, the premises of ductility beh...

In this work, Slow Strain Rate Test (SSRT) testing, Light Optical Microscopy (LOM) and Scanning Electron Microscopy (SEM) were used to study the effect of microstructure, corrosive environments and cathodic polarisation on stress corrosion cracking (SCC) of two grades of high strength steels, Type A and Type B. Type A is manufactured by quench and tempered (Q&T) method. Type B, a normalize stee...

Lateritic steel is a low-nickel with nickel content of 1-4.5 percent. Steel high percentage has better qualities like strength, corrosion resistance, and weldability. This material commonly used in crushers grinding machines. can also be utilized as an armor material. A study was undertaken to investigate the ability laterite employed by characteristic testing (impact test hardness test) micros...

TMCP (thermo-mechanical controlled process) linepipes have long been used in severe sour environments, but recently sulfide stress cracking (SSC) caused by local hard zones has become a concern. In order to clarify the hardness threshold that leads SSC, four-point bend (4PB) SSC tests as specified NACE TM0316 were conducted under several H2S partial pressure conditions. At pressures of 1 bar an...

Examination of a time–temperature–transformation (TTT) diagram for an eutectoid carbon steel (Fig. 1), bearing in mind the fact that the pearlite reaction is essentially a high temperature one occurring between 550C and 720C and that the formation of the martensite is a low-temperature reaction, reveals that there is a wide range of temperature ∼250–550C within which neither of these phases for...

In order to optimize the strength-toughness matching of auto body components. Taking B1500HS steel as research object. The influence die temperature on microstructure and properties was studied by hot stamping tests flat die, mechanical observation tests. study shows that is not sensitive below 250°C. When 20–250°C, tensile strength above 1400 MPa, while plastic-toughness poor; 300°C, begins ge...