Low-temperature fracture failure analysis of 30CrMnSiA steel structural part

doi:10.13251/j.issn.0254-6051.2023.08.045

Abstract

Abstract: Fracture of 30CrMnSiA steel structural part occurred under impact load in a low-temperature environment. The fracture morphology, microstructure and inclusions, chemical composition, hardness, tensile properties and impact properties were tested and analyzed by means of scanning electron microscope, metallurgical microscope, inductively coupled plasma spectrometer (ICP), hardness test, tensile test, and impact test. The results indicate that during quenching and tempering, the actual tempering temperature is lower than the required temperature, which results in the transformation of the metallographic structure into tempered martensite. The tempered martensite has low impact absorbed energy at -40 ℃, which is the main reason for brittle fracture under impact at -40 ℃. The grade of non-metallic inclusions such as sulfides and silicates exceeds the design requirements, and a large number of inclusions promote rapid crack initiation and propagation.

Key words: 30CrMnSiA steel, low temperature, impact effect, fracture

CLC Number:

TG157

Guo Qiang, Chi Kegang. Low-temperature fracture failure analysis of 30CrMnSiA steel structural part[J]. Heat Treatment of Metals, 2023, 48(8): 276-279.

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