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对30CrNiMoNb钢不同奥氏体化温度下析出相进行了研究,结果表明,钢在热轧态时Nb C大量析出有效地防止晶粒长大,使基材获得细小原始奥氏体晶粒。钢淬火时,当淬火温度低于1050℃时,Nb C析出相部分固溶于奥氏体,但未固溶Nb C可起到钉扎作用,抑制奥氏体晶粒长大,保证30CrNiMoNb钢获得细晶组织;当温度高于1050℃,Nb C部分固溶于奥氏体,未固溶部分出现明显长大,对奥氏体晶粒的钉扎作用减弱,导致奥氏体晶粒长大。
The precipitated phases of 30CrNiMoNb steel at different austenitizing temperatures were studied. The results show that the precipitated phase of NbC is effectively prevented during the hot rolling of the steel, which can effectively prevent the grain growth and make the original austenite grains smaller. When the quenching temperature of steel is below 1050 ℃, part of NbC precipitated phase is dissolved in austenite, but NbC can be used as a pinning effect to suppress austenite grain growth and ensure that 30CrNiMoNb steel When the temperature is higher than 1050 ℃, part of NbC solid solution in austenite, the un-dissolved part of the apparent growth of the austenite grain pinning weakens, resulting in austenite grain length Big.