EFFECTS OF SULPHUR ON HOT DUCTILITY OF LOW-CARBON STEEL AUSTENITE.

被引：0
|
作者：
Yasumoto, K. [1 ]
Maehara, Y. [1 ]
Ura, S. [1 ]
Ohmori, Y. [1 ]
机构：
[1] Sumitomo Metal Industries Ltd,, Central Research Lab, Amagasaki, Jpn, Sumitomo Metal Industries Ltd, Central Research Lab, Amagasaki, Jpn
来源：
Materials Science and Technology | 1985年 / 1卷 / 02期
关键词：
IRON AND STEEL METALLOGRAPHY - Precipitation - SULFUR;
D O I：
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中图分类号：
学科分类号：
摘要：
The hot ductility of low-carbon austenite has been studied in order to reveal the hot-cracking mechanism related to sulfur segregaton and sulfide precipitaton during solution treatment and deformation. Ductility was greatly reduced during high-strain-rate tensile deformation in the temperature range 1073-1373 K. Fracture occurred via a typical intergranular mode, characterized by both shallow dimples caused by microvoid coalescence and rather smooth facets caused by intergranular decohesion. The former morphology is a result of the dense precipitation of sulfides, identified as Fe-rich (Fe, Mn)S, on the austenite grain boundaries. Hot ductility is improved on decreasing the solution-treatment temperature, on decreasing the cooling rate from high solution temperatures, and on isothermal holding at the deformation temperature before starting the tensile test.
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页码：111 / 116
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