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首页> 外文会议>International conference on semi-solid processing of alloys and composites >Comparison of Semisolid Microstructure Evolution of Wrought Nickel Based Superalloy GH4037 with Different Solid Fraction
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Comparison of Semisolid Microstructure Evolution of Wrought Nickel Based Superalloy GH4037 with Different Solid Fraction

机译：不同固体成分的锻造镍基高温合金GH4037的半固态组织演变比较

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摘要

The research on semisolid metal forming of Ni-based superalloys is limited because of the difficulties in preparing semisolid billets. Traditional methods for fabricating semisolid billets are SIMA and RAP. In order to decrease the processing procedures, a new method called semi-solid isothermal treatment of wrought superalloy (SSITWS) was used to fabricate semisolid billets in this paper. In order to get the optimal parameters to fabricate Ni-based GH4037 semisolid billets, the effects of isothermal temperature and soaking time on microstructure evolution were investigated. The isothermal temperature ranges from solidus to liquidus, and the soaking time ranges from 10min to 60min. The results show that near-globular grains can be obtained only in the semi-solid state with appropriate solid fractions. When the solid fraction was high, the shape of grains was irregular and the average size of grains was large and inhomogeneous. When the isothermal temperature reached 1350°C, spherical grains appeared, and many small intragranular liquid droplets existed. During the appropriate isothermal temperature range, from 1350°C to 1380°C, the shape of solid grains was globular and the size of solid grains was homogeneous. At the same time, the size of the grains and the roundness of the grains increased with the increasing of isothermal temperature.
机译：由于制备半固态坯料的困难，对镍基高温合金半固态金属成形的研究是有限的。 SIMA和RAP是制造半固态坯料的传统方法。为了减少加工程序，本文采用一种称为锻造高温合金的半固态等温处理（SSITWS）的新方法来制造半固态坯料。为了获得制备Ni基GH4037半固态坯料的最佳参数，研究了等温温度和保温时间对组织演变的影响。等温温度为固相线至液相线，均热时间为10min至60min。结果表明，只有在具有适当固体分数的半固态下才能获得近球形的晶粒。当固含量高时，晶粒的形状不规则，晶粒的平均尺寸大且不均匀。当等温温度达到1350℃时，出现球形颗粒，并且存在许多小的颗粒内液滴。在适当的等温温度范围（1350°C至1380°C）中，固体颗粒的形状呈球形，并且固体颗粒的大小均匀。同时，随着等温温度的升高，晶粒的尺寸和圆度也随之增加。

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