申佳林,韦贤毅,徐平伟,梁益龙,周烨,梁宇.δ相对GH4169合金强韧性的影响规律研究[J].稀有金属材料与工程,2019,48(5):1467~1475.[Jia-lin Shen,Xian-yi Wei,Ping-wei Xu,Yi-long Liang,Ye Zhou,Yu Liang.Influence of δ Phase on strength and toughness of GH4169 Alloy[J].Rare Metal Materials and Engineering,2019,48(5):1467~1475.]
δ相对GH4169合金强韧性的影响规律研究
投稿时间:2017-10-25  修订日期:2018-03-15
中文关键词:  GH4169合金  δ相  强韧性  裂纹扩展
基金项目:国家自然科学基金(No. 51461007 and No. 51761003);贵州省自然科学基金(No. [2015] 3012, No. [2014] 2003 and No.[2014]6012)
中文摘要:
      通过断裂韧度J0.2BL以及冲击韧性测试研究了δ相百分含量对GH4169合金韧性的影响。结果表明,随固溶温度增加,δ相含量从1.54%降低到0.045%,晶粒尺寸从12.59 μm长大到35.21 μm,δ相含量对拉伸强度无显著影响,但断裂韧度J0.2BL从112 KJ/m增加到355 KJ/m, 冲击韧性从35 J增加到75 J。δ相的析出会导致其周边出现无γ″相析出区,当大量δ相沿晶界分布时,则沿晶界形成无强化相析出带,在应力作用下,δ相与无强化相析出区基体的应变差会导致界面开裂、形成孔洞。在无强化相析出区孔洞快速连接形成裂纹,裂纹沿晶扩展与空洞汇合,降低了裂纹扩展阻力,加速了裂纹的扩展。因此δ相的存在为裂纹提供了扩展通道,降低了材料的塑韧性。
Influence of δ Phase on strength and toughness of GH4169 Alloy
英文关键词:GH4169 alloy  δ phase  strength and toughness  crack propagation
英文摘要:
      The influence of the δ phase on the toughness of GH4169 alloy was investigated by means of the fracture toughness J0.2BLand instrumented impact experiment. Experimental results indicate that with the increase of solution temperature, δ phase content reduced from 1.54% to 0.045%, and grain size grew up from 12.59 to 35.21 μm. δ phase content has no obvious effect on the strength of the material, but the fracture toughnessJ0.2BL increased from 112 KJ/m to 355 KJ/m, the impact toughness increased from 35 J to 75 J. δ phase is mainly distributed along the grain boundary, there is no strengthening phase precipitation around it. The zone with no strengthening phase near the grain boundary will be formed, it promote the crack propagation along the grain boundary. Moreover, the δ phase itself is the intermetallic compound. Under certain plastic deformation conditions, it is easy to separate from micro plastic zone and form a cavity. In the micro plastic zone, the cavities are rapidly interlinked to form a crack, and the crack grows along the grain boundary with the cavity, which reduces the crack propagation resistance and accelerates the crack propagation. Therefore, the presence of δ phase provides an extended channel for the crack and reduces the toughness of the material.
作者单位E-mail
申佳林 贵州大学材料与冶金学院 943651683@qq.com 
韦贤毅 贵州大学材料与冶金学院 550135446@qq.com 
徐平伟 贵州大学材料与冶金学院 289186934@qq.com 
梁益龙 贵州大学材料与冶金学院  
周烨 贵州大学材料与冶金学院  
梁宇 贵州大学材料与冶金学院 xq.liangyu@126.com 
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