Abstract
The problem of hydrogen embrittlement in ultra-high-strength steels is well known. In this study, slow strain rate, four-point bending, and permeation tests were performed with the aim of characterizing innovative materials with an ultimate tensile strength higher than 1000 MPa. Hydrogen uptake, in the case of automotive components, can take place in many phases of the manufacturing process: during hot stamping, due to the presence of moisture in the furnace atmosphere, high-temperature dissociation giving rise to atomic hydrogen, or also during electrochemical treatments such as cataphoresis. Moreover, possible corrosive phenomena could be a source of hydrogen during an automobile’s life. This series of tests was performed here in order to characterize two press-hardened steels (PHS)—USIBOR 1500® and USIBOR 2000®—to establish a correlation between ultimate mechanical properties and critical hydrogen concentration.
Highlights
There is tension between the priority of maintaining and, if possible, increasing the safety of drivers and passengers and the necessity of reducing CO2 emissions and, the weight of vehicles
Hydrogen can be adsorbed in various phases: during electrolytic processes as pickling, electroplating, cataphoresis, and phosphating or even through the moisture present during welding or heat treatment, which can cause hydrogen absorption in the material
Press-hardened steels (PHS) are hot-formed steels used in automobile structural and safety components, as they present high homogeneity of mechanical properties and excellent fatigue resistance
Summary
There is tension between the priority of maintaining and, if possible, increasing the safety of drivers and passengers and the necessity of reducing CO2 emissions and, the weight of vehicles To resolve this issue, an increasing amount of work is being done on researching and characterizing new high-grade materials which can potentially reduce emissions. Press-hardened steels (PHS) are hot-formed steels used in automobile structural and safety components, as they present high homogeneity of mechanical properties and excellent fatigue resistance. Their manufacturing process consists mainly of the austenitizing of blanks in an oven, followed by martensitic quenching in a water-cooled stamping tool
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