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该厂用德国进口散件组装的奔驰重型卡车使用不到半年,后桥板簧组就有多片板簧发生断裂事故。材料为50CrV4钢。扫描电镜断口观察和X射线能谱微区分析发现,板
The factory used Germany imported spare parts assembly Mercedes heavy truck used less than six months, the rear axle leaf spring group has multiple leaf spring fracture. The material is 50CrV4 steel. Scanning electron microscopy fracture observations and X-ray energy spectrum microanalysis revealed that plate