Abstract
To investigate the relationship between inclusions and bending fatigue behaviors in 20Cr2Ni4 steel under different stress concentrations. This paper designs a new experimental method to prefabricate different size stress concentrations near the inclusions, and then conducts a new type of bending fatigue test to study the inclusions and their surrounding stress distributions in 20Cr2Ni4 steel. A microhardness tester was combined with laser etching equipment to realize the prefabrication of different stress concentrations at arbitrary positions around any inclusion on the gear steel surface. This method provides an experimental basis for the quantitative analysis of the relationship between stress distribution and fatigue life around the inclusions of heavy-duty gear steels. We also predict the bending fatigue lives of heavy-duty gear steels with different types of inclusions, stress states, and spatial distributions. Then, based on the prefabricated notch parameters and the state of inclusions in the steel, a mathematical model of quantitative analysis is proposed, which can accurately predict the fatigue limit of heavy-duty gear steel. The research results can be applied to the actual use of heavy-duty gears and to the accurate life estimation based on the state of gear stress, thereby providing a quantitative reference model for subsequent gear steel production and gear part processing.
Highlights
A wide range of industrial applications use 20Cr2Ni4 alloys because of their excellent combination of mechanical ductility and fatigue resistance [1]. This alloy has the characteristics of good hardenability, surface hardness, wear resistance, toughness, low-temperature impact toughness, anti-contact fatigue, and gluing ability [2]
The purpose of this study is to predict the fatigue lives of steel inclusions and analyze the bending fatigue behaviors caused by inclusions
The inclusions were unevenly distributed in the steel, and some inclusions with metal reinforcement and
Summary
A wide range of industrial applications use 20Cr2Ni4 alloys because of their excellent combination of mechanical ductility and fatigue resistance [1]. This alloy has the characteristics of good hardenability, surface hardness, wear resistance, toughness (after carburizing and quenching), low-temperature impact toughness, anti-contact fatigue, and gluing ability [2]. The high strength, low density, and good formability characteristics of 20Cr2Ni4 are desirable for heavy-duty impulse system gears. In the large-scale mechanical equipment research field, there have been extensive studies regarding the implementation of 20Cr2Ni4 in the manufacturing of gears, rolling bearings, and pin bearings [3,4,5]. The material used in those manufacturing processes is required to have high mechanical properties, such as those of the high-strength steel 20Cr2Ni4 in this paper
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