球墨铸铁低温冲击韧性的研究  

Study on Impact Toughness of Ductile Cast Iron at Subzero

作　　者：王强[1] 李雷[1] 桃野正[2] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]日本国立室兰工业大学材料物性工学院,日本室兰0508585

出　　处：《铸造》2010年第2期193-196,共4页Foundry

基　　金：河南省教育厅基金资助(2008A460009);河南理工大学博士基金(648524);青年骨干教师基金(649027);北海道科学技术综合振兴中心项目

摘　　要：研究了球墨铸铁基体组织中珠光体率和石墨数量对其硬度以及低温(-20℃)冲击韧性的影响。研究结果表明,随着珠光体率的增加,球墨铸铁硬度增加,但低温冲击韧性下降;对于铸态和正火态球铁,石墨数量对基体硬度和U形缺口低温(-20℃)冲击韧性几乎没有影响。对于退火态球铁,随着石墨数量的增加,-20℃冲击韧性值显著增加;当石墨数量达到400个/mm2时,其U形缺口冲击韧性达29.0 J/cm2,是铸态的3倍。The effects of pearlite rate and graphite nodule count on the hardness and impact toughness of ductile cast iron at subzero （-20 ℃） were studied. The results indicate that the hardness of the matrix increases and the impact toughness at subzero decreases with the increase of the pearlite rate. For the as-cast ductile cast iron has little effect both on the matrix hardness and on and normalizing one, the graphite nodule count impact toughness at subzero. However, for the annealing ductile iron, the impact toughness at subzero distinctly increases with the increase of the nodule count. When the nodule count is up to 400 nod/mm2, the impact toughness of U-notch specimen at -20 ℃ reaches 29.0 J/cm^2, and it is three times of as-cast ductile iron.

关 键 词：球墨铸铁 低温冲击韧性 石墨数量 珠光体 铁素体 

分 类 号：TG143.5[一般工业技术—材料科学与工程]