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中碳鈣硫易切削鋼夾雜物形態控制

Inclusion morphology control in medium-carbon calcium sulphur free-cutting steel

  • 摘要: 在實驗室進行了1kg坩堝實驗,研究了中碳高硫結構鋼鈣處理前后夾雜物的形態、尺寸及組成.結果表明:鋼鈣處理后獲得了可以改善鋼切削性的紡錘形夾雜物,夾雜物的平均紡錘形率為68.11%,并且隨鋼中Ca/S增加夾雜物紡錘形化趨勢增加;鈣處理后小于2.5μm的夾雜物占夾雜物總量的76.05%,夾雜物細小、彌散分布于鋼基體中;夾雜物類型以鈣鋁酸鹽芯硫化物外殼的復合夾雜物、(Mn,Ca)S形式的硫化物為主,有少量的鋁酸鈣與CaS的復合夾雜物;含鈣硫的45鋼鑄態鋼錠比普通45鋼鑄態鋼錠切削性能有所改善.

     

    Abstract: The 1kg crucible experiment was carried out in laboratory. The shape, size and composition of inclusions in medium-carbon high-sulphur structural steel were investigated. The results show that fusiform inclusions, which can improve the cutability of the steel, account for 68.11% in total inclusions, and the ratio of fusiform inclusions increases with increasingCa/S. After calcium treatment the inclusions is very tiny, inclusions of less than 2.5 μm in size account for 76.05% and scattered in the matrix of the steel. The inclusions are mainly composed of (Mn, Ca)S sulfide and complex inclusions in which the core is calcium aluminate and the shell is sulfide. There are small amount of complex inclusions of calcium aluminate and calcium sulfide in the inclusions, too. The cutability of the ingot steel containing sulphur and calcium is better than that of middle carbon steel.

     

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