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EFFECTS OF AGING TEMPERATURE AND TIME ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AN Fe-BASE SUPERALLOY

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Acta metallurgica sinica(English Letters) 1991年第1期4卷 25-32页

作者： guo shouren lu dezhong guo Jianting institute of metal research,academia,shenyang,chinaWU Xi Fushun Steel Works,Fushun,china Associate Professor,institute of metal research,academia sinica,shenyang 110015,china

The mechanical properties and microstructure of an Fe-base superalloy GH35A have been examined after aging at 650—750℃ for 100—10000 *** tensile strength of the alloy changes no more with aging temperature and the time at room temperature,but the ductility and impact toughness at room temperature,as well as the stress-rupture life up to 700℃ de- crease slowly during aging up to 10000 h The initiation time to worsen its properties becomes shorter as the aging temperature *** variation of the mechanical properties of the alloy was found mainly depending on the formation,morphology,distribution and characteristic of the σ-phase precipitation.

关键词： superalloy aging mechanical property σ-phase γ-phase

Effect of Carbon on DA718 Alloy with P Addition

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Journal of Materials Science & Technology 2003年第6期19卷 616-618页

作者： Na LI, shouren guo, dezhong lu, Wenru SUN, Yan XU and Zhuangqi HUinstitute of metal research, Chinese Academy of Sciences, shenyang 110016, china Inst. of metal Res. Chinese Acad. of Sci. Shenyang 110016 China

Lower content of carbon can further improve the stress rupture life of p-modified DA 718 alloy up to more than 270%. Meanwhile, the ductility of the alloy decreased a little. More boron atoms dissociate due to decreasing carbon content and interact with phosphorus which brings the longer stress rupture life of the alloy. Less carbon may induce more phosphorus segregating in the grain boundary and result in brittleness.

关键词： DA 718 alloy Carbon Phosphorus

Effect of Phosphorus on Stress Rupture Properties of GH4133 Ni-Base Superalloy

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Journal of Materials Science & Technology 2003年第4期19卷 289-293页

作者： Wenru SUN+, shouren guo, Baiyun TONG, dezhong lu, Yan XU, Xiaona MENG, Na LI and Zhuangqi HUDepartment of Superallovs, institute of Metai research, Chinese Academy of Sciences, shenyang 110016, china Dept. of Superalloys Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The effect of phosphorus on the stress rupture property of GH4133 alloy has been investigated and is compared with that of IN718 alloy. The GH4133 alloy is crept by dislocation movement. Phosphorus has a tendency to prolong the rupture life of some wrought superalloys by inhibiting the dislocation movement. If the phosphorus addition is too high, its effect on impairing the grain boundary cohesion overwhelms that on inhibiting the dislocation movement, and the life of the GH4133 alloy can be shortened. The two functions of inhibiting the dislocation movement and impairing the grain boundary cohesion determine that the optimum phosphorus content in the GH4133 alloy is around 0.011 wt pet. Phosphorus exhibits a greater effect on prolonging the rupture life of IN718 alloy than that of GH4133 alloy. The two alloys are crept by different mechanisms. The intergranular phosphorus-bearing phase is precipitated in the IN718 alloy, while not in the GH4133 alloy. The precipitation of the phosphorus bearing phase can balance the phosphorus segregation at the grain boundaries and allows a more remarkable effect of phosphorus on extending the rupture life of IN718 alloy.

关键词： Phosphorus Alloy GH4133 Stress Rupture property

微量元素P对Ni基铸造高温合金组织和持久性能的影响

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金属学报 2000年第12期36卷 1240-1243页

作者：徐岩郭守仁卢德忠王玉兰胡壮麒中国科学院金属研究所沈阳110015

研究了微量元素Ｐ对一种Ｎｉ基铸造高温合金组织和９５０℃不同应力条件下持久性能的影响结果表明，随着Ｐ含量的升高，合金的持久寿命和持久延伸率不断提高，当Ｐ含量（质量分数，下同）为０．０１７％时持久寿命达到峰值；Ｐ... 详细信息

研究了微量元素Ｐ对一种Ｎｉ基铸造高温合金组织和９５０℃不同应力条件下持久性能的影响结果表明，随着Ｐ含量的升高，合金的持久寿命和持久延伸率不断提高，当Ｐ含量（质量分数，下同）为０．０１７％时持久寿命达到峰值；Ｐ含量超过０．０１７％时合金在（γ＋γ’）共晶前沿析出磷化物相．Ｐ对合金持久性能的有益作用是由于Ｐ偏聚到枝晶间和晶界，抑制晶界扩散，从而提高合金的晶界强度．

关键词：磷镍基铸造高温合金显微组织持久性能

硼、硫和铝对磷在IN718合金中作用的影响

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材料研究学报 2000年第2期14卷 183-187页

作者：宋洪伟郭守仁卢德忠徐岩王玉兰胡壮麒中国科学院金属研究所

分析了硼、硫和铝对磷在ＩＮ７１８合金中作用的影响．结果表明，磷改善晶界δ相，显著提高持久性能．磷提高持久寿命的相对幅度不受铝含量的明显影响，但随着硼含量的增加而加强、硫含量的增加而减弱．硼、硫和铝对磷的作用的影响... 详细信息

分析了硼、硫和铝对磷在ＩＮ７１８合金中作用的影响．结果表明，磷改善晶界δ相，显著提高持久性能．磷提高持久寿命的相对幅度不受铝含量的明显影响，但随着硼含量的增加而加强、硫含量的增加而减弱．硼、硫和铝对磷的作用的影响取决于其各自的晶界行为．

关键词： IN718合金磷硼硫铝持久性能镍基合金