THE EFFECT OF PHOSPHORUS SEGREGATION ON THE INTERMEDIATE-TEMPERATURE EMBRITTLEMENT OF FERRITIC, SPHEROIDAL GRAPHITE CAST-IRON

被引：23

作者：

CHEN, SF

LUI, TS

CHEN, LH

机构：

[1] Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1994年 / 25卷 / 03期

关键词：

D O I：

10.1007/BF02651597

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The objective of this article is to study the effect of phosphorus segregation on the fracture modes of the intermediate-temperature intergranular embrittlement which occur in ferritic, spheroidal graphite cast iron. The specimens were quenched from 820-degrees-C and 500-degrees-C during the furnace-cooling period of ferritization annealing in order to vary the degree of phosphorus segregation, then deformed in tension at various temperatures between 20-degrees-C and 520-degrees-C with a constant crosshead speed of 0.01 mm/s. These two kinds of specimens were also fractured by impact at about -50-degrees-C in the vacuum chamber of a scanning Auger microscope in order to analyze the phosphorus segregation and compare the fracture modes. The results show that the fracture mode of the intermediate-temperature embrittlement is influenced by the history of heat treatment prior to tension. When the specimens were held at 500-degrees-C and quenched from this temperature, the fracture was intergranular. However, the specimens quenched from 820-degrees-C revealed cleavage fracture with cracks propagating radially from a central region with magnesium-rich particles. Identified by transmission electron microscopy (TEM), the particles were MgO. Grain-boundary segregation of phosphorus in the specimen held at 500-degrees-C was confirmed by Auger analysis of the impact fracture surface. Segregation of phosphorus must play an important role in die fracture mode of the intermediate-temperature intergranular embrittlement.

引用

页码：557 / 561

页数：5

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