GRAIN BOUNDARY BEHAVIOUR OF ULTRA-HIGH-STRENGTH STEELS AT HIGH TEMPERATURES.

被引：0
|
作者：
Zhou Yu [1 ]
Xu Shoulian [1 ]
Feng Xuefei [1 ]
机构：
[1] Harbin Inst of Technology, China, Harbin Inst of Technology, China
来源：
Kang T'ieh/Iron and Steel (Peking) | 1986年 / 21卷 / 10期
关键词：
METALLOGRAPHY - Grain Boundaries - MICROSCOPIC EXAMINATION - THERMAL EFFECTS;
D O I：
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中图分类号：
学科分类号：
摘要：
The grain boundary behavior and carbide dissolution of four kinds of ultra-high-strength steel (40SiMnCrNiMoV, 37SiMnCrNiMoV, 45CrMnMoV, and 28Cr3SiNiMoWV) were investigated by using high-temperature microscope HT-100. Results indicate that grains grow in two ways depending on temperature. If the heating temperature is low ( less than 1000 degree C), grains grow by means of grain boundary migration, and the relationship between the migrated distance (s) and the time (t) can be expressed as s equals kt**N. If the steels are heated to a given high temperature, the grains grow suddenly to a very large size. This kind of sudden growth of grains can eliminate impurity segregation at grain boundaries, so that the fracture of the steels is improved.
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页码：43 / 48
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