Abstract: Influence  of0~0.89%  Nb  content  on  structure  and  mechanical  properties  of  quenched(1000~1200  ℃)  -  tempered(200~650℃)steel  Cr8WMo2V2SiNb  has  been  studied.  Results  showed  that  with  increasing  Nb  content  the  as-cast  structure  and  eutectic  carbide morphology  improved,the  amount  of refractory  carbides  increased remarkably to restrain the growth of austenite grain; and the quenching temperature of steel could appropriately increased by adding Nb to increase secondary hardening ability and wear resistance and get higher integrated mechanical properties of steel.

摘要： 研究了0～0.89%Nb含量对淬火(1 000～1 200℃)-回火(200～650℃)CrSWMo2V2SiNb钢组织和力学性能的影响。结果表明,随着Nb含量提高,钢的铸态组织和共晶碳化物形态得以改善,难熔铌的碳化物增多,明显抑制了淬火奥氏体晶粒长大;加铌可相应提高淬火温度,增加钢的二次硬化能力和耐磨性,使钢具有较高综合机械性能。

关键词: 铌, Cr8WMo2V2SiNb钢, 组织, 二次硬化, 力学性能