Deuterium Of The Hr2 Anti-hydrogen Steel Mechanical Properties At Room Temperature And The Organizational Structure

Hydrogen-resistant austenitic stainless steel HR2 was charged with deuterium in 10MPa D2 pressure at 400℃for 10 days. Samples with and without deuterium was deformed at room temperature in these two ways:(1)quasi-static tension at strain rates of 10-3s-1 and 10-5s-1; (2)Hopkinson impact at strain rates of 1×103s-1,2×103s-1 and 3×103s-1. Then fracture morphorlogy was obtained by means of SEM. Microstructure was characterized by use of OM,XRD and TEM and phase structure was determined by XRD,VSM and EBSD. Effects of deuterium pre-charging on mechanical properties and microstructure of HR2 steel was discussed in different strain rates. Also HR1 steel was investigated by comparision. In adition, texture of deformed HR2 steel and its relation with internal deuterium, strain and strain rate were characterized by EBSD.At strain rates of 10-5s-1 and 10-3s-1, ductility was lower and strength was higher for samples pre-charged with deuterium in comparison with samples without deuterium. And the fracture mode of samples precharged turned to be quasi-cleavage fracture. Deuterium damage was obvious in HR2 steel precharged with deuterium and became more serious while samples were deformed at lower strain rate.Austenite phase of HR2 steel was more stable than HR1 steel at RT. At strain rates of 10-5s-1 and 10-3s-1,α'martensite in order of 10-6 was found in HR2 steel while 4.5～9.3%α' martensite in HR1 steel. The amount of a'martensite in both HR1 and HR2 steel was decreased by increasing the strain rate. But a'martensite transformation was suppressed in HR1 and HR2 steels precharged with deuterium and the suppression will become weak in higher strain rate.After quasi-static tension, HR2 steel exhibited typical tensile texture:<111>+<100>, but {112}<111> texture became stronger and {110}<111> texture weaker after pre-charging. Amount of dislocation was increased remarkably and a fibre texture was developed in HR2 steel after impact at the strain rate of 103s-1, but texture deviated from a fibre in precharged samples. This suggests that slip was the main deformation mechanism for HR2 steel while quasi-static tension and impact. Plane slip was improved and cross slip inhibited by deuterium precharging.