退火温度对无铝超高碳钢组织及性能的影响  

Effects of Annealing Temperature on Microstructure and Property of Aluminum-Free Ultrahigh Carbon Steel

作　　者：薛贯鲁[1] 曲家民 王志敏[1] 刘庆锁[2] 

机构地区：[1]济宁市技师学院,济宁272000 [2]天津理工大学材料科学与工程学院,天津300384

出　　处：《机械工程材料》2017年第10期82-85,共4页Materials For Mechanical Engineering

基　　金：天津市科技特派员计划项目(15JCTPJC64600);济宁市2013年度产学研合作项目

摘　　要：对名义成分为Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo的一种无铝超高碳钢在800~1 100℃进行了退火处理,利用物相分析、显微组织观察、力学性能测试等方法研究了退火温度对该钢显微组织和力学性能的影响。结果表明:退火温度为800℃时,试验钢组织中存在大量的网状碳化物;当退火温度升至860℃时,网状碳化物消失,获得由细小均匀分布的碳化物加珠光体组成的组织;当退火温度进一步升至1 000℃以上时,试验钢中的珠光体组织变得粗大,且再次析出了网状碳化物;随退火温度的升高,试验钢的抗拉强度和冲击功先增大后减小,且均在860℃时达到最大,分别为1 017 MPa和15J。The annealing treatments at 800-1 100 ℃ were conducted on an aluminum-free ultrahigh carbon steel with nominal composition of Fe-1.58 C-1.97 Cr-0.26 Si-0.73 Mn-0.09 Mo,and then the effects of the annealing temperature on the microstructure and mechanical properties of the steel were studied by the methods such as phase analysis,microstructural observation,mechanical property tests.The results show that at the annealing temperature of 800 ℃,a large number of net-like carbides existed in the microstructure of the tested steel.When the annealing temperature increased to 860 ℃,the net-like carbides disappeared and the microstructure of fine and evenly distributed cabides and pearlite was obtained.When the annealing temperature increased further to 1 100 ℃,the pearlite became coarse and net-like carbides precipitated again in the tested steel.With the increase of annealing temperature,the tensile strength and impact energy of the tested steel first increased then decreased and both reached the peak values at 860 ℃,which were 1 017 MPa and 15 J,respectively.

关 键 词：无铝超高碳钢 退火温度 碳化物 力学性能 

分 类 号：TG156.1[金属学及工艺—热处理]