W,Mo含量对700℃叶片用GY200镍基合金析出相及性能的影响  

Precipitation Phases and Mechanical Properties of GY200 Ni-Based Alloy for Blade with W and Mo Addition

作　　者：龚志华[1,2] 杨钢[2] 马龙腾[2] 王鲁[2] Gong Zhihua;Yang Gang;Ma Longteng;Wang Lu(School of Material and Metallurgy, Inner Mongolia University of Science ＆ Technology, Baotou 014010, Chi- na;Special Steel Institute of Central Iron and Steel Research Institute, Beij＇ing 100081, China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《稀有金属》2018年第3期246-251,共6页Chinese Journal of Rare Metals

基　　金：国家科技部“863”项目(2012AA03A502)资助

摘　　要：通过调整GY200型镍基高温合金中W,Mo的含量配比,设计了6种不同成分的合金。利用扫描电镜（SEM）、X射线衍射仪（XRD）、相分析等手段,研究W,Mo含量对GY200合金的析出相及性能的影响。结果表明合金强度随W,Mo含量增加而提高,塑韧性稍微有所下降,Mo,W总添加量达到一定时,强度不随合金元素添加量的变化而发生改变。W,Mo含量增加,合金在700℃下的强度增加,W添加量大于4%会恶化合金高温塑性。W,Mo含量的增加,γ＇,MC相含量增加,当W＋Mo总量添加达到6%时,γ＇含量不随W,Mo继续增加而变化。W,Mo原子进入γ＇相中替代了Ni原子,W添加量在8%以内,进入γ＇中的W占加入W的总质量分数维持在20%~30%之间;W,Mo添加对M23C6析出产生不同影响,未添加Mo的合金,W含量在4%以内,M23C6型碳化物析出数量较稳定,进一步提高W含量,析出减少。添加Mo后,W的添加量从2%提高到4%时,M23C6含量会急剧降低。Six GY200 alloys with different tungsten and molybdenum contents were designed through composition optimization. Scanning electron microscope（SEM）,X-ray diffraction（XRD） and chemical analysis method were carried out to illustrate the effect of W and Mo addition on the microstructure and mechanical properties of GY200 alloy. The results showed that optimized W and Mo addition in GY200 alloy would lead to higher strength and a slight decrease of ductility. GY200 alloy with tungsten content of 4% showed the lowest impact toughness. The addition of molybdenum would degrade impact property of this alloy. The strength and plasticity of this alloy at 700 ℃ increased with the addition of W and Mo when W content was lower than 4%. Besides,the high temperature plasticity of this alloy would be deteriorated when W addition was greater than 4%. Higher W and Mo contents in this alloy resulted in higher contents of MC and γ＇ precipitates. However,with W and Mo addition increasing up to 6%,the content of γ＇ would rarely change. Mo and W atoms would substitute some Ni atoms of γ＇,20% ~ 30% of W gross content would enter into the γ＇ phase if W addition mass wasless than 8%,while the peak value of M_（23）C_6 content were found in alloy containing 4% W. Moreover,the addition of 2% Mo in GY200 alloys exerted favorable influence onthe precipitation behavior of MC and γ＇. However,increasing W addition from 2% to 4%brought about a sharp decrease of M23C6 content.

关 键 词：GY200 W MO M23C6 γ'相 

分 类 号：TG142.7[一般工业技术—材料科学与工程]