Abstract
The interaction between plastic deformation and hydrogen damage behavior of 30CrMnSiNi2A steel was investigated by pre-strain tensile tests and hydrogen charging by electrochemical method. This paper mainly contains two parts. The plastic deformation was restrained by hydrogen-charged, and the effect of hydrogen brittleness damage behavior was accelerated by pre-plastic deformation measure. Tensile pre-strian tests with hydrogen charging at current density from 0 to 50 mA/cm2 for 120 min were performed at room temperature. Both rate of reduction in areaand elongation were decreased due to the transition from ductile to brittle fracture by hydrogen charging, which meant the ability of plastic deformation was reduced by hydrogen. With hydrogen concentration increasing, yield strength also increased indicating that the plastic deformation forming conditions of steel were improved by hydrogen. Hydrogen content increased with pre-strain measured by glycerol gas collection method. Due to the pre-strain measure before hydrogen charging, the reduction of area and elongation were further reduced, while the strength was unexpectedly low. It was because pre-strain promoted the formation of hydrogen-induced crackings (HIC). This proved that the plastic deformation promoted the generation of hydrogen damage.
Highlights
The problem of hydrogen embrittlement in industrial applications has attracted enormous attention for years, which is severe in the high-strength steels
When the martensitic advanced high-strength steel is in low pH in 3.5% NaCl, hydrogen embrittlement susceptibility increased with increasingly negative potentials [4]
The tested steel used in this investigation, 30CrMnSiNi2, was a kind of low alloy ultra-high strength steel with the chemical composition listed in table 1
Summary
The problem of hydrogen embrittlement in industrial applications has attracted enormous attention for years, which is severe in the high-strength steels. When the martensitic advanced high-strength steel is in low pH in 3.5% NaCl, hydrogen embrittlement susceptibility increased with increasingly negative potentials [4]. Refining microstructure of quenched-partitionedtempered low carbon steel improves the hydrogen embrittlement resistance [7]. As the pre-strain increases, the hydrogen embrittlement sensitivity of screw-thread steel bars increases first and decreases [10]. It is necessary to study the effect of pre-strain on hydrogen embrittlement of 30CriMnSiNi2A steel. This paper helps explain the mechanism of hydrogen embrittlement for 30CriMnSiNi2A steel from the perspective of macroscopic experiments and microscopic fracture
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