Abstract

51CrV4 spring steel is widely used in heavy duty dump trucks ascribing to its superior mechanical properties. The fatigue life and strength of dump trucks are the main performance indicators that must be considered in the manufacturing process. Cryogenic treatment (CT) can improve the main performance of materials which has been proved by recently research. The effect of cryogenic treatment CT on the axial tensile fatigue strength of 51CrV4 spring steel was studied in this paper. The results showed that the axial tension-tension fatigue life of 51CrV4 spring steel after CT was significantly higher than conventional heat treatment (CHT) samples. The microstructure of 51CrV4 leaf spring material is mainly acicular bainite and thin strip martensite after CT. Compared with CHT, CT makes the microstructure of the material more compact. The introduction of cryogenic treatment (CT) before tempering makes the Ca element in the material aggregate, and the micro amount of Ca has the function of deoxidizing and desulphurizing and improving the morphology of sulfide, thus enhancing the fatigue life of the material.

Highlights

  • 51CrV4 plate spring steel has certain strength and good plastic toughness, which is widely used in the manufacture of automobile suspension steel plate [1]

  • It was important to note that the average hardness of the sample after both treatments is within the standard range of the spring material: 40.5 HRC minimum and 48 HRC maximum [33]

  • The effect of the introduction of Cryogenic treatment (CT) technology on the fatigue life of 51CrV4 plate spring steel in conventional heat treatment (CHT) process was studied in this paper

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Summary

Introduction

Strength requirements are involved in the design of heavy vehicle suspensions, especially in terms of impact and fatigue [2]. Microstructural characteristics are one of the primary factors affecting a components fatigue life. There are two main approaches of leaf spring manufacturing for altering the microstructure of the spring material: chemical composition selection and heat treatments [3]. Besides the chemical composition and steelmaking process, heat treatments are normally the last step to achieve the desired steel properties [4]. Heat treatment has been widely used to improve the properties of materials

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