均热温度对含铌钢筋奥氏体化的影响  

Effects of Heating Temperature on Austenitization of Nb Microalloying Steels

作　　者：黄敏[1] 曹建春[1] 周晓龙[1] 杨银辉[1] 陈伟[2,3] 李丹[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]昆明理工大学冶金与能源工程学院,昆明650093 [3]武钢集团昆明钢铁股份有限公司,昆明650302

出　　处：《材料导报》2014年第20期106-110,共5页Materials Reports

基　　金：国家自然科学基金(51261009);昆明理工大学校人才培养基金(14118575)

摘　　要：研究了3种含铌钢筋在不同均热温度下奥氏体晶粒长大和铌的固溶规律,建立了3种钢筋的奥氏体晶粒长大模型。结果表明:铌能够有效地抑制奥氏体晶粒长大,提高奥氏体的粗化温度。铌含量为0.014%时,奥氏体粗化温度约为1200℃,最佳均热温度约为1170℃。铌含量在0.027%和0.036%时,奥氏体晶粒的粗化温度约为1250℃,最佳均热温度约为1230℃。奥氏体晶界处有少量未溶的碳化铌颗粒,其数量随着加热温度升高逐渐减少。Austenite grain growth and the solution of Nb at different heating temperature were studied in three Nb microalloying steels. In addition, the grain growth model of three tested steels during heating was established for three different Nb microalloying steels. The result showes that Nb additions can restrain austenite grain growth and raising austenite grain coarsening temperature. When Nb content is 0. 014% , coarsening austenite grains are found at around 1200 ℃ ,the best soaking temperature is about 1170 ℃. When Nb content is 0. 027% and 0. 036%, coarsening austenite grains are found at around 1250℃,the best soaking temperature is about 1230℃. A small amount of undissolved NbC particles are observed in the grain boundaries, the number of undissolved particles gradually decrease with the increase of heating temperature.

关 键 词：加热温度 铌含量 奥氏体晶粒尺寸 未溶相颗粒 

分 类 号：TG115[金属学及工艺—物理冶金]