应用加工图技术优化阻燃钛合金高温变形工艺  

Optimization of Hot Deformation Parameters of Burn Resistant Titanium Alloy by Using Processing Map

作　　者：孙欢迎 曹京霞[1] 王宝[1] 黄旭[1] 曹春晓[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《稀有金属材料与工程》2013年第11期2351-2355,共5页Rare Metal Materials and Engineering

摘　　要：在热模拟试验机上对铸态和挤压态组织的阻燃钛合金（Ti-35V-15Cr-Si-C）进行了等温恒应变速率热压缩试验,温度范围铸态为900～1200℃、挤压态为900～1150℃,应变速率范围为10-3～1 s-1,测试了真应力-真应变曲线并对其形成机制进行了分析.基于动态材料模型建立了2种状态合金的热加工图并进行分析.结果表明：铸锭开坯较优的热加工工艺是挤压成形;与铸态合金相比,挤压态合金发生连续动态再结晶的工艺条件范围明显扩大,并且显著抑制了局部塑性流动失稳的发生;由于高温下碳化物溶解而产生的合金基体变脆不能通过工艺方法消除,为了避免表面开裂,热加工应尽量选择变形温度低于1030℃进行.The hot compressive deformation tests of as-cast and as-extruded bum resistant titanium alloys （Ti-35V-15Cr-Si-C） were performed on the Gleeble-1500 simulator in the temperature range of 900～1200 ℃ for as-cast and 900～1150 ℃ for as-extruded alloy,over the range of strain rate from 10-3 s-1 to 1 s-1.The compressive true stress vs.true strain curves were measured,and the hot processing maps of both as-cast and as-extrude state alloys were constructed based on dynamic materials model （DMM）.The results show that：（1）extrusion is the preferable ingot cogging processing technology; （2） compared to the as-cast burn resistant alloy,it is easier for the extruded alloy to generate a continuous recrystallization,and the flow localization instability for as-extruded alloy is restrained.（3） the brittleness due to carbide solution at higher temperature can not be eliminated through the processing treatment.To avoid surface cracking,the appropriate deformation temperature should be lower than 1030 ℃.

关 键 词：阻燃钛合金 热加工图 工艺优化 动态回复 动态再结晶 

分 类 号：TG146.23[一般工业技术—材料科学与工程]