锻造和热处理工艺对TC4钛合金显微组织和冲击韧度的影响  

Effects of Forging and Heat Treatment Processes on Microstructure and Impact Toughness of TC4 Titanium Alloy

作　　者：苏化冰 尹林 江红军 秋大闯 SU Huabing;YIN Lin;JIANG Hongjun;QIU Dachuang(Wuxi Turbine Blade Co.,Ltd.,Wuxi 214174,Jiangsu China)

机构地区：[1]无锡透平叶片有限公司,江苏无锡214174

出　　处：《热处理》2023年第4期36-39,48,共5页Heat Treatment

摘　　要：研究了热处理和锻造工艺,包括700℃×1 h空冷,800℃×1 h空冷,800℃×1 h炉冷至500℃空冷,958℃×1 h水冷+700℃×2 h空冷,958℃×1 h水冷+750℃×2 h空冷,分别在938℃、948℃、958℃锻造后空冷、风冷和水冷,对TC4钛合金显微组织及冲击韧度的影响。结果表明:随着锻造温度的升高,合金中初生α相含量减少,晶粒尺寸减小;随着锻造后冷却速率的提高,合金中初生α相含量增多,晶粒尺寸减小;退火炉冷的合金冲击韧度最佳,且初生α相含量和晶粒尺寸最大;随着退火温度的升高,合金中初生α相含量无明显变化,而晶粒尺寸略有增大;时效温度从700℃提高至750℃,合金中初生α相含量提高了约21%,平均晶粒尺寸降低了6%;固溶随后时效处理的合金中初生α相的含量和晶粒尺寸远小于退火处理的合金。The effects of heat treatment and forging processes,in which soaking at 700℃for 1 h then air cooling,soaking at 800℃for 1 h then air cooling,soaking at 800℃for 1 h then furnace cooling to 500℃followed by air cooling,soaking at 958℃for 1 h then water cooling followed by soaking at 700℃for 2 h and air cooling,soaking at 958℃for 1 h and water cooling followed by soaking at 750℃for 2 h then air cooling,and forging at 938℃,948℃and 958℃then cooling in air,forced⁃air and water,respectively,were involved,on microstructure and impact toughness of TC4 titanium alloy was investigated.The results showed that(a)with the rise in forging temperature,both content and grain size of primaryαphase decreased in the alloy;(b)as the cooling rate increased after forging,the primaryαphase increased in content and decreased in grain size;(c)the alloy cooled in furnace after annealing exhibited the best impact toughness and the maximum content and grain size of the primaryαphase;(d)with the increase in annealing temperature,the primaryαphase had no obvious change in content but increased in grain size in the alloy;(e)as the aging temperature rose from 700 to 750℃,the primaryαphase increased 21%in content and decreased 6%in average grain size in the alloy;and(f)both the content and the grain size of primaryαphase in the alloy solution treated and then aged were much less than those in the alloy annealed.

关 键 词：锻造 热处理 TC4钛合金 显微组织 冲击韧度 

分 类 号：TG156[金属学及工艺—热处理] TG316[金属学及工艺—金属学]