【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。更多还原

【Abstract】 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.更多还原