750℃退火出炉温度对QT450-10球墨铸铁组织与性能的影响  

Effect of discharge temperature during annealing at 750 ℃ on microstructure and properties of QT450-10 nodular cast iron

作　　者：高永旺 孔祥玲 李鹏明 刘越 Gao Yongwang;Kong Xiangling;Li Pengming;Liu Yue(School of Materials Science and Engineering,Northeastern University,Shenyang Liaoning 110819,China;Vacuum Dry Pump Business Division,SKY Technology Development Co.,Ltd.,Chinese Academy of Sciences,Shenyang Liaoning 110179,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]中科院沈阳科学仪器股份有限公司干泵事业部,辽宁沈阳110179

出　　处：《金属热处理》2022年第1期261-265,共5页Heat Treatment of Metals

基　　金：辽宁省重点科技研发计划(201404001)。

摘　　要：利用光学显微镜、扫描电镜等方法研究了在750℃退火工艺下不同出炉温度对QT450-10球墨铸铁的珠光体含量、渗碳体形态、抗拉强度以及硬度的影响。结果表明,球墨铸铁试样在经过不同出炉温度下的微观组织均由铁素体、石墨球、石墨颗粒以及少量渗碳体组成。由于珠光体的分解、渗碳体残留以及石墨颗粒的形成导致在750℃出炉空冷时试样的抗拉强度下降7%左右、布氏硬度下降13%左右。随着出炉温度的降低,试样残留渗碳体的分解以及石墨颗粒的长大,导致抗拉强度、硬度均有所下降,当出炉温度为100℃时试样的抗拉强度下降10%左右、布氏硬度下降20%左右。Effect of the discharge temperature on pearlite content, cementite morphology, tensile strength and hardness of the QT450-10 nodular cast iron annealed at 750 ℃ was studied by means of optical microscope and scanning electron microscope. The results show that the microstructure of the nodular cast iron samples are composed of ferrite, globular graphite, graphite particles and a small amount of cementite under different discharge temperatures of the annealing process. Due to the decomposition of pearlite, the residue of cementite and the formation of graphite particles, the tensile strength and Brinell hardness of the samples decrease about 7% and 13% respectively when the discharge temperature is 750 ℃. Due to the decomposition of residual cementite and the growth of graphite particles when the discharge temperature decreases, the tensile strength and hardness decrease. When the discharge temperature is 100 ℃, the tensile strength and Brinell hardness decrease about 10% and 20%, respectively.

关 键 词：球墨铸铁 退火 出炉温度 显微组织 力学性能 

分 类 号：TG156.25[金属学及工艺—热处理]