Microstructural Characteristics and Hardness Enhancement of Super Duplex Stainless Steel by Friction Stir Processing

被引：2
|
作者：
Pan, Linlin [1 ,2 ]
Kwok, Chi Tat [2 ,3 ]
Lo, Kin Ho [2 ,3 ]
机构：
[1] Guangdong Acad Sci, China Ukraine Inst Welding, Guangdong Prov Key Lab Adv Welding Technol, Guangzhou 510650, Peoples R China
[2] Univ Macau, Dept Electromech Engn, Macau 999078, Peoples R China
[3] Univ Macau, Inst Appl Phys & Mat Engn, Macau 999078, Peoples R China
来源：
MATERIALS | 2022年 / 15卷 / 18期
关键词：
friction stir processing; super duplex stainless steel; microstructural evolution; hardness; MECHANICAL-PROPERTIES; CORROSION-RESISTANCE; HOT DEFORMATION; EVOLUTION; RECRYSTALLIZATION; TEXTURE;
D O I：
10.3390/ma15186267
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In the present study, microstructural evolution and hardness of the friction stir processed (FSPed) SAF 2507 super duplex stainless steel fabricated at a rotational speed of 650 rpm and a traverse speed of 60 mm/min were investigated. A scanning electron microscope (SEM) equipped with an electron backscatter diffraction (EBSD) detector was used to study the microstructure of the stir zone. The grain sizes of austenite and ferrite in the FSPed 2507 were found to be smaller (0.75 and 0.96 mu m) than those of the substrate (6.6 and 5.6 mu m) attributed to the occurrence of continuous dynamic recrystallization (CDRX) in both phases. Higher degree of grain refinement and DRX were obtained at the advancing side of the FSPed specimens due to higher strain and temperature. A non-uniform hardness distribution was observed along the longitudinal direction of the SZ. The maximum hardness was obtained at the bottom (407 HV1).
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页数：16
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