钛合金等温变形的组织与性能  被引量:2

Microstructure and properties of isothermal deformed titanium alloy

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作  者:田卫军[1,2] 李郁[2] Tian Weijun Li Yu(Ming De College, Northwestern Polytechnical University, Xi'an Shaanxi 710124, China Sehool of Meehanieal Engineering, Northwestern Polytechnieal University, Xi'an Shaanxi 710124, China)

机构地区:[1]西北工业大学明德学院,陕西西安710124 [2]西北工业大学机电学院,陕西西安710124

出  处:《金属热处理》2016年第10期38-42,共5页Heat Treatment of Metals

基  金:西工大明德学院青年基金(15JK2166)

摘  要:在β单相区对钛合金锻件进行了等温锻造和热处理,研究了等温锻造温度、变形程度和热处理工艺对钛合金锻件显微组织和力学性能的影响,并探讨了工艺参数的作用机理。结果表明:随着等温锻造温度的提高,初生α相的宽度有所增加,次生α相宽度有所减小,而β转变组织的含量有较大幅度降低;随着变形程度的增加,钛合金锻件的原始β晶粒大小、晶界α相宽度、粗片状α相宽度和面积分数逐渐增加,而晶内细片状α相宽度逐渐减小;940℃×1 h水冷+550℃×5 h空冷的试样中粗片状α相宽度、β转变组织中二次α相宽度最小,而β转变组织面积分数最大;等温锻造温度为995℃、变形程度为75%、940℃×1 h水冷+550℃×5 h空冷热处理的钛合金锻件可以取得较好的强度与塑性结合。The titanium alloy forgings were isothermal forging and heat treatment in the β phase region,the effect of isothermal forging temperature,deformation degree and heat treatment process on the microstructure and mechanical properties of the forging was studied,and the mechanism of process parameters was explored. The results show that,with the increase of isothermal forging temperature,the width of primary α phase increases,while the width of secondary α phase decreases,while the content of β structure is greatly reduced; with the increase of deformation degree,the original β grain size,width of grain boundary α phase,width and area fraction of coarse lamellar α phase gradually increase,and width of intragranular fine lamellar α phase decreases gradually. The width of coarse lamellar α phase and the secondα phase in β transformation structure are minimum,and the area fraction of β transformation structure is maximum after 940 ℃ × 1 h watercooled + 550 ℃ × 5 h air cooling treatment; the forgings can get the best strength and plasticity combination with the isothermal forging temperature is 995 ℃,deformation degree is 75% and the heat-treatment is 940 ℃ × 1 h water-cooled + 550 ℃ × 5 h air cooling.

关 键 词:钛合金锻件 等温变形 热处理 组织 性能 

分 类 号:TG319[金属学及工艺—金属压力加工]

 

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