The conformation, distribution and size of inclusions as well as fracture surfaceat cracking area of motor vehicle wheel rims of A3 steel were examed by using optical microscopeand SEM.

　
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  • 本文采用金相顯微鏡和掃描電鏡觀(guān)察了A3鋼制造的汽車(chē)車(chē)輪輪箍的開(kāi)裂部位的夾雜物的形態(tài)、布和大小以及斷口的形貌。
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