张源虎
,
项毅
,
孙坚
,
胡赓祥
,
李铁藩
金属学报
本文应用扫描电镜、剖面分析及EDAX能谱分析,研究了具有平直晶界和曲折晶界两种不同组织的GH302合金,及Rene 80合金在空气、含硫环境中的高温蠕变及断裂行为。试验结果表明,具有曲折晶界的GH302合金试样,虽然在空气环境中蠕变和持久性能明显地高于通常平直晶界试样,但在10％SO_2-空气环境中,二者的性能皆剧烈下降;定向凝固Rene80合金不仅在空气环境中性能显著优于普通铸造的合金,在含硫环境中仍保持原先水平。在含硫环境中蠕变与腐蚀的交互作用下,蠕变裂纹的扩展是以硫化-氧化腐蚀在应力促进下沿晶侵入并形成低熔点共晶,导致早期破坏。
关键词:
高温合金
,
grain boundary
,
sulphidation
,
oxidation
,
creep rupture
赵坦张匀陈光楼琅洪
材料研究学报
采用液态金属冷却(LMC)工艺和成分优化设计, 制备出一种高温性能优异的低Re含量第二代柱晶高温合金DZ59, 通过扫描电镜(SEM), 透射电镜(TEM)等方法对其组织特征及蠕变断裂进行了表征, 研究了合金的蠕变断裂性能. 结果表明, DZ59合金的高温蠕变断裂性能超过一代单晶合金, 并接近二代单晶合金的水平. 发现柱晶高温合金的二次晶界反应(SGRZ)现象, 表明SGRZ受温度和应力的控制, 由于增加了合金横向晶界的受力界面, 在高负荷下可能成为蠕变空洞萌生和扩展的位置.
关键词:
金属材料
,
2nd generation DS superalloy
,
creep rupture
,
second grain reaction zone(SGRZ)
,
TCP phase
YANG Zhi'an SHI Changxu XIAO Yaotian Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China.
材料科学技术（英）
The correlation between the creep rupture behaviour and the stacking fault energy of matrices of γ′strengthened superalloys has been studied dur- ing constant load creep.At high temperature and intermediate stress,the creep rupture time and strain strongly depend on the stacking fault energy of matrices rather than the creep friction stress,but at higher stress,the role of grain boundary carbides becomes more obvious. However,in the considerably extensive stress range investigated here,the mean creep rate is a power function of the stacking fault energy of matrices and the power index decreases with in- creasing initial applied stress.Particularly,at inter- mediate stresses the product of this index and the initial applied stress compensated by the shear modulus is same for two series of superalloys. Hence,this product may be a criterion predicting that the matrix deformation controls high tempera- ture creep rupture.
关键词:
creep rupture
,
null
,
null
杨亚红
,
朱丽慧
,
姜筠
,
王起江
,
朱长春
材料热处理学报
采用扫描电镜和透射电镜观察了HR3C钢在650℃持久试验前后的微观组织,并探讨了持久过程中析出相变化对硬度的影响.结果表明:供应态HR3C钢的基体为奥氏体,存在大量孪晶及少量一次NbCrN和MX相.持久过程中析出二次触须状NbCrN和M23C6.持久初期,触须状NbCrN和M23C6的析出使得HR3C钢的硬度快速上升.持久1608 h后,不断增加的触须状NbCrN是硬度继续上升的主要原因.4203 h后,M23 C6的粗化使得硬度开始下降.
关键词:
HR3C耐热钢
,
高温持久
,
组织
,
力学性能
,
强化机理
刘恩泽
,
郑志
,
佟健
,
宁礼奎
稀有金属材料与工程
研究了一种新型定向高温合金DZ142的微观组织,测定了DZ142合金持久性能、抗氧化性能、抗热腐蚀性能并与DZ125L合金进行比较.结果表明:热处理后的DZ142合金组织主要由γ、γ'、(γ+γ')共晶和MC型碳化物组成;经长期时效处理,合金时效组织中未见有害的TCP相,碳化物类型仍为MC型.DZ142合金的持久性能,高温抗氧化性能和抗热腐蚀性能都优于DZ125L合金.
关键词:
高温合金
,
微观组织
,
持久性能
,
热腐蚀
杨亚红
,
朱丽慧
,
王起江
,
朱长春
钢铁
doi:10.13228/j.boyuan.issn0449-749x.20140183
S31042钢是一种重要的超临界和超超临界锅炉用钢。针对该钢持久塑性差的问题，采用扫描电镜和透射电镜研究了S31042钢在650℃持久前后的微观组织，主要探讨了析出相对持久塑性的影响。结果表明：持久1608 h，S31042钢的塑性快速下降。而后塑性缓慢下降，并逐渐趋于稳定。S31042钢持久过程中主要的析出相为二次NbCrN和M23C6，长期持久会导致少量σ相和Cr3Ni2SiC的析出。S31042钢持久塑性显著下降的主要原因是由于M23C6在晶界上的析出。此外，链状M23C6、立方形M23C6以及未溶的NbCrN对S31042钢的持久塑性也有害。
关键词:
S31042耐热钢
,
高温持久
,
组织
,
持久塑性
ZHANG Yuanhu SUN Jian XIANG Yi HU Gengxiang Shanghai Jiaotong University
,
Shanghai
,
ChinaLI Tiefan Institute of Corrosion and Protection of Metals
,
Academia Sinica
,
Shenyang
,
China Yuanhu
,
Department of Materials Science and Engineering
,
Shanghai Jiaotong University
,
Shanghai
,
200030
金属学报(英文版)
Studies on the high temperature creep and fracture behaviours in air or in SO_2 contaminated environment for the Fe-base superalloy GH302 with flat or zigzag grain boundaries(GB) and the Ni-base superalloy Rene 80 were carried out.Although the creep rupture properties of the GH302 with zigzag GB was remarkably superior to that of flat GB in air,the properties of both droped dramatically in 10% SO_2-air environment,the creep rupture properties of the directional solidified Rene 80 were much better than that of the conventionally cast alloy in air,and also kept the same property in SO_2 contaminated environment as in air.Owing to the interaction between creep and sulphidation,the failure mechanism relates to the formation of molten Ni-Ni-3S_2 eutectic along GB,led to the premature failure of the alloy.
关键词:
superalloy
,
null
,
null
,
null
,
null
J.M.Gong
金属学报(英文版)
In this paper, the effect of carbon migration on creep properties of Cr5Mo dissimilar welded joints with Ni-based (Inconel 182) and Cr23Ni13 (A302) austenitic weld metal was investigated. Carbon migration near the weld metal/ferritic steel interface of Cr5Mo dissimilar welded joints was analyzed by aging method. Local creep deformations of the dissimilar welded joints were measured by a long-term local creep deformation measuring technique. The creep rupture testing was performed for Cr5Mo dissimilar welded joints with Inconel 182 and A302 weld metal. The research results show that the maximum creep strain rate occurs in the decarburized zone located on heat affect zone (HAZ) of Cr5Mo ferritic steel. The creep rupture life of Cr5Mo dissimilar welded joints with A302 weld metal decreases due to carbon migration and is about 50％ of that welded with Inconel 182 weld metal.
关键词:
dissimilar welded joint
,
null
,
null
