THE ROLE OF ACTIVE ELEMENTS IN FE-CR-AL ALLOYS FOR HEATING ELEMENT APPLICATIONS

被引：9

作者：

SATYANARAYANA, DVV

PANDEY, MC

机构：

[1] Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad

来源：

BULLETIN OF MATERIALS SCIENCE | 1995年 / 18卷 / 03期

关键词：

FERRITIC STAINLESS STEEL; HEATING ELEMENT; ACTIVE ELEMENT; DUCTILE BRITTLE TRANSITION TEMPERATURE; GRAIN GROWTH; FRACTURE MODE;

D O I：

10.1007/BF02749658

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The role of active elements (zirconium, cerium and yttrium) in grain growth and its subsequent effect on room-temperature tensile fracture behaviour of Fe-Cr-Al alloys has been investigated. The alloys containing active elements exhibited improved resistance to grain growth. Yttrium-containing alloy retained higher room-temperature tensile ductility even after heating at higher temperatures because of its superior resistance to grain coarsening. All the alloys, with and without active elements, exhibited a sudden drop in room-temperature tensile ductility, with concommitant change in fracture mode from dimple rupture to cleavage, in a narrow band of 39-44 mu m grain size. The ductile-brittle transition temperatures (DBTT) of these alloys were found to be 150 degrees C and 215 degrees C fdr grain sizes 25 mu m and 100 mu m respectively. The accelerated life test showed-that the alloys containing active elements exhibited longer lives.

引用

页码：207 / 221

页数：15

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