扫描方式对激光立体成形GH4169合金高温力学性能和热疲劳性能的影响  

Influences of scanning method on mechanical properties at high temperature and thermal fatigue property of laser solid forming alloy GH4169

作　　者：刘晓璇 刘江波 

机构地区：[1]河北轨道运输职业技术学院机电系,河北石家庄050051

出　　处：《锻压技术》2017年第12期140-143,共4页Forging & Stamping Technology

基　　金：河北省人力资源和社会保障厅科研项目(JRSHZ-2016-01126)

摘　　要：扫描方式是激光立体成形的一个重要工艺参数,选择3种不同的扫描方式对GH4169高温合金进行激光立体成形试验,并进行了500℃高温力学试验和1000次25~500℃冷热循环的热疲劳试验。结果表明:与沿长边平行往复扫描相比,长短边交替平行往复扫描时合金的抗拉强度和屈服强度分别增大了82和79 MPa,断后伸长率基本不变,热疲劳裂纹级别从7级变为2级。沿短边平行往复扫描时,合金力学性能和热疲劳性能介于沿长边平行往复扫描和长短边交替平行往复扫描之间。扫描方式优选为:长短边交替平行往复扫描。Scanning method is an important process parameter of laser solid forming. Superalloy GH4169 specimens were produced by laser solid forming with three different kinds of scanning methods,and the specimens were conducted by mechanical test at high temperature of 500 ℃ and thermal fatigue tests between 25 ℃ and 500 ℃ for 1000 times. The results show that comparing with the parallel scanning along the long side,the tensile and yield strength of the alloy by alternate parallel scanning along the long and short sides are increased by82 MPa and 79 MPa,and the elongation stain is unchanged basically,while the thermal fatigue crack grade changes from grade 7 to grade2. The mechanical properties and thermal fatigue property of alloy by the parallel scanning along the short side are between parallel scanning along the long side and alternating parallel scanning along the long and short sides. Thus,the alternating parallel scanning of long and short sides is the optimized scanning method.

关 键 词：激光立体成形 扫描方式 GH4169高温合金 热疲劳性能 高温力学性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程]