9CR6W3MO2V2模具钢的特点有哪些？
(1) Adding CR elements to 9CR6W3MO2V2 steel can improve the hardenability of the steel, and at the same time, it can be dissolved in the matrix and strengthen the matrix structure. On the other hand, the carbide of CR is formed in the steel as a strengthening phase.
(2) The addition of Mo, W and V elements in 9CR6W3MO2V2 steel mainly forms carbides, which are used as the strengthening phase in the steel to improve the strength, hardness and wear resistance of the steel, and at the same time refine the grain and improve the toughness of the steel. In particular, V has a strong effect on grain refinement.
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(3) When 9CR6W3MO2V2 steel is austenitized, a small amount of Mo, W and V elements can be dissolved in the austenite with their carbides, which further improves the hardenability. At the same time, they exist in the cooled matrix structure, which strengthens the matrix structure and improves the tempering stability of the steel. In addition, the addition of Mo, W, and V elements will cause secondary hardening.
⑷在9CR6W3MO2V2钢中加入Mo和W元素可以消除钢的回火脆性。
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(5) A small amount of Si and Mn elements in 9CR6W3MO2V2 steel not only improves hardenability, but also mainly dissolves in the matrix structure, which plays a role in strengthening the matrix structure and improving the tempering stability of the steel. In addition, silicon can improve the distribution and morphology of carbides.
(6) Compared with CR12 and CR12MOV steel, 9CR6W3MO2V2 steel has better performance than CR12 and CR12MOV steel, especially secondary hardening, this is because the content of carbon and chromium in 9CR6W3MO2V2 steel is reduced, the inhomogeneity of eutectic carbides is improved, more Mo, W and V elements are added, and the grain refinement effect is enhanced.
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(7) 9CR6W3MO2V2 steel has strong tempering stability, can maintain high hardness in a wide range of tempering temperatures, and its hardness index is higher than that of matrix steel and high-carbon and high-chromium steel. Its strength and toughness are better than those of high-speed steel and matrix steel.