Can hydrogen embrittlement affect the fatigue behavior of metals in valves?

Introduction

Hydrogen embrittlement has the potential to alter the fatigue behavior of metals, including those used in valves. Fatigue failure in valves is typically attributed to cyclic actuation and pressurization.

Answer

Yes, hydrogen embrittlement can impact the fatigue behavior of metals, including those used in valves. It can increase the crack growth rate by as much as 10 times compared to the rate observed in air environments. However, it’s important to note that the frequency of actuation and pressurization cycles in valves is expected to be very low, which mitigates the risk of fatigue failure.