双重退火工艺对准β锻TC18合金锻件组织和性能的影响  

Effect of double annealing process on microstructure and properties of TC18 alloy quasi-βforged piece

作　　者：汤育玺 王进 崔明磊 刘刚伟 常康 Tang Yuxi;Wang Jin;Cui Minglei;Liu Gangwei;Chang Kang(Shaanxi Hongyuan Aviation Forging Company Ltd.,Xianyang Shaanxi 713801,China)

机构地区：[1]陕西宏远航空锻造有限责任公司,陕西咸阳713801

出　　处：《金属热处理》2024年第11期262-266,共5页Heat Treatment of Metals

摘　　要：研究了不同双重退火工艺参数下,TC18合金准β锻锻件组织和性能的变化规律。结果表明,随着一次退火高温段温度的升高,层片状α相发生分离,促使了层片状α相的球化,锻件塑性略有降低;随着一次退火高温(830℃)降至低温(750℃)降温时间的缩短,锻件的强度增加,塑性和断裂韧度降低;随着一次退火中温阶段温度的升高,未转变β组织及弥散分布的次生α相的数量增加,锻件强度上升,断裂韧度和塑性下降;次生α相的形貌与数量与二次退火温度相关,随着二次退火温度的升高,次生α相聚集长大,弥散程度下降,锻件的强度下降,断裂韧度和塑性上升。Effect of double annealing process on microstructure and mechanical properties of the TC18 alloy quasi-βforged piece was investigated.The results show that with the increase of first annealing high-stage temperature,lamellarαphases separate and spheroidize,the plasticity decreases slightly.With the decrease of cooling time from high-stage temperature(830℃)to middle-stage temperature(750℃)and with the increase of first annealing middle-stage temperature,the strength increases but the plasticity and the fracture toughness decrease.With the increase of first annealing middle-stage temperature,the quantity of untransformedβmicrostructure and dispersed secondaryαphases increases.The second annealing temperature has a great effect on the morphology and content of the secondaryαphases.With the increase of second annealing temperature,the secondaryαphases aggregate and grow,and its dispersion degree decreases,the strength of the forging decreases,while the plasticity and fracture toughness increase.

关 键 词：TC18合金锻件 准β锻 双重退火 显微组织 力学性能 

分 类 号：TG156.2[金属学及工艺—热处理]