镍基单晶高温合金的研发进展
张健,王莉,王栋,谢光,卢玉章,申健,楼琅洪

Recent Progress in Research and Development of Nickel-Based Single Crystal Superalloys
Jian ZHANG,Li WANG,Dong WANG,Guang XIE,Yuzhang LU,Jian SHEN,Langhong LOU
表4 几种定向凝固工艺的特点
Table 4 Comparison of several directional solidification processes

Process

Advantage

Shortcoming

Physical potential of the cooling effectiveness[112]

Estimate of cooling effectiveness in an industry process [112]

PDAS for large cored blades*μm

High rate

solidification (HRS)

Easy operation, technical maturity

Shadow effect, temperature gradient decreased with casting size increasing

1

0.6

400~600[112]

Gas cooling

casting (GCC)

High temperature gradient with little influence by casting size

shadow effect, complex operation

1.7

1.5

320[112]

Liquid metal

cooling (LMC-Sn)

High temperature gradient with little influence by casting size

Casting contamination, complex operation

1.45

1.5

220~350

Liquid metal

cooling (LMC-Al)

Relatively high temperature gradient with little influence by casting size

Casting contamination, complex operation

1

1

360[112]

Fluidized bed

cooling (FBC)

High temperature gradient with little influence by casting sizeAlloy and equipment contamination, complex operation--

330[112]