Suppression of softening in heat affected zone by Mo addition in friction stir welded martensitic steel

被引：6
|
作者：
Wu, Zexi [1 ]
Ushioda, Kohsaku [1 ]
Fujii, Hidetoshi [1 ]
机构：
[1] Osaka Univ, Joining & Welding Res Inst, Osaka, Japan
来源：
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2022年 / 27卷 / 03期
基金：
日本学术振兴会;
关键词：
Martensitic steel; friction stir welding; micro-hardness; HAZ softening; Mo addition; precipitation strengthening; Ashby-Orowan model; SOLUBILITY PRODUCTS; TENSILE PROPERTIES; LATH MARTENSITE; STRENGTH; PRECIPITATION; HARDNESS;
D O I：
10.1080/13621718.2022.2036567
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The drastic softening in the heat affected zone (HAZ) of friction stir welded 0.2C-2Si-3Mn martensitic steel occurred due to the martensite tempering in the subcritical temperature range just below A(1) temperature in HAZ. It was revealed that the softening in the subcritical HAZ was successfully suppressed by Mo addition. The optimum condition was found to be 3 wt-% Mo addition with the solution temperature of 1120 degrees C, where densely distributed nanometer-sized Mo2C were confirmed by transmission electron microscopy and atom probe tomography in the subcritical HAZ. These fine Mo2C precipitates gave rise to an increase in the hardness of approximately 110 HV compared with a no-Mo-added sample, which was in good agreement with the predicted precipitation strengthening value based on the Ashby-Orowan model.
引用
收藏
页码：204 / 212
页数：9
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