In situ observations of non-equilibrium austenite formation during weld solidification of an Fe-C-Al-Mn low-alloy steel

被引：45

作者：

Babu, SS ^{[1
]}

Elmer, JW

David, SA

Quintana, MA

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[3] Lincoln Elect Co, Cleveland, OH 44117 USA

来源：

PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2002年 / 458卷 / 2020期

关键词：

non-equilibrium solidification; phase transformations; in situ synchrotron diffraction; welding process;

D O I：

10.1098/rspa.2001.0891

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The microstructure and properties of a welded alloy are influenced by the combined effects of solidification and subsequent. solid-state transformations that occur during weld cooling. These phase transformations are further influenced by the cooling rate that the weld experiences and thus by the type of welding process that is used. In this research, microstructure development of a low-alloy steel weld was investigated under the high cooling rates produced by stationary arc welds. These welding conditions are different from the slow weld-cooling conditions, where delta-ferrite forms as the primary solidification phase. The cooling rates of the stationary welds used in this study were of the order of 10(3) K s(-1), which were high enough to induce the formation of the non-equilibrium austenite phase during solidification. This non-equilibrium mode of solidification was directly observed using an in situ time-resolved X-ray diffraction technique using synchrotron radiation, and the resulting microstructures were examined using optical microscopy.

引用

页码：811 / 821

页数：11

共 14 条

[11]

Quintana MA, 2001, WELD J, V80, p98S

[12] Investigation of real-time microstructure evolution in steep thermal gradients using in-situ spatially resolved X-ray diffraction: A case study for Ti fusion welds [J].