通常认为,形成难溶碳化物的元素,如Ti,Nb,Zr,Ta 等,不能利用以提高结构钢的淬透性,因为这些元素所形成的碳化物(TiC,NbC,ZrC 等)行结构钢常用淬火温度(800°～900℃)下几乎不溶入奥氏体。此时,由于碳化物颗粒的存在,钢的淬透性可能反而减小。当Ti<0.1%时,中炭钢及基析钢的淬透性略增,而Ti=0.17%时,则(?)重减小。在含～2%Cr 的结构钢中,<0.2%Zr 对淬透性儿无影响,0.5%Zr 已使淬透性 It is generally believed that elements that form insoluble carbides, such as Ti, Nb, Zr, Ta, etc., can not be utilized to improve the hardenability of structural steels because the carbide (TiC, NbC, ZrC, etc.) Commonly used in steel quenching temperature (800 ° ~ 900 ℃) almost insoluble in austenite. At this point, the hardenability of the steel may instead be reduced due to the presence of carbide particles. When Ti is less than 0.1%, the hardenability of medium carbon steel and base steel is slightly increased, while Ti = 0.17%, the weight of (?) Decreases. In structural steels with ~ 2% Cr, <0.2% Zr has no effect on hardenability, 0.5% Zr has hardenability