关键词: 磨损腐蚀, 金相组织, 疲劳断裂, 应力集中

Abstract:

We analyze such failure reasons of steel plate Q235B fracture of gas generator as its chemical composition, fracture appearance and inclusion composition by a spectrometer, a metallurgical microscope, an electron probe, etc. We discover that the main causes of the steel plate fracture are sulfidesilicate inclusion and strip metallographic structure in the steel plate. We further present such prevention and improvement measures as inclusion reduction, normalizing processing or strip structure elimination through diffusion annealing.

Key words: abrasion and corrosion, stress concentration, metallographic structure, fatigue fracture