Microstructural evolution in ultra-low-carbon steel weldments - Part I: Controlled thermal cycling and continuous cooling transformation diagram of the weld metal

被引：30

作者：

Fonda, RW ^{[1
]}

Spanos, G ^{[1
]}

机构：

[1] USN, Res Lab, Joining & Transformat Sect, Washington, DC 20375 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2000年 / 31卷 / 09期

关键词：

D O I：

10.1007/s11661-000-0132-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The transformation behavior and microstructural evolution of the as-deposited weld metal from an ultra-low-carbon (ULC) weldment were characterized by dilatometry, optical microscopy, transmission electron microscopy, and microhardness measurements. These results were used to construct a continuous cooling transformation (CCT) diagram for this weld metal. The major microconstituents observed in this ULC weldment were tin order of decreasing cooling rate) coarse autotempered martensite, fine lath martensite, lath ferrite, and degenerate lath ferrite. No polygonal ferrite was observed. These results were also used to develop criteria to differentiate between the two predominant microstructures in these ULC steels, lath martensite, and lath ferrite, which can look quite similar but have very different properties.

引用

页码：2145 / 2153

页数：9