Effects of Partitioning Time and Temperature on the Microstructure and Mechanical Properties of a High Strength Microalloyed Steel

被引：1
作者：
Almasi, Ali [1 ]
Kianvash, Abbas [1 ]
Tutunchi, Abolfazl [1 ]
机构：
[1] Univ Tabriz, Inst Engn Mech, Dept Mat Engn, Tabriz 5166616471, Iran
来源：
METALLOGRAPHY MICROSTRUCTURE AND ANALYSIS | 2021年 / 10卷 / 04期
关键词：
Quenching and partitioning (Q-P); Retained austenite; Yield strength; Tensile strength; Hardness; Fracture elongation; ULTRA-HIGH STRENGTH; HEAT-TREATMENT; RETAINED AUSTENITE; MARTENSITE; STABILITY; EVOLUTION; DUCTILITY; CARBIDES; BAINITE; QUENCH;
D O I：
10.1007/s13632-021-00762-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
In the present study, in a quenching-partitioning (Q-P) process, the effects of partitioning time (Pt) and partitioning temperature (PT) on the mechanical and microstructural properties of a microalloyed Fe-0.21C-1.5Si- 2.2Mn-0.054Al-0.08Ti steel were studied. The XRD and SEM results confirmed increases in retained austenite (gamma(R)) volume fraction (V gamma(R)) and gamma(R) carbon concentration by increasing Pt and PT. XRD patterns confirmed reduction in V gamma(R) by further increasing the Pt and PT over 500 s and 390 degrees C, respectively, due to super-saturation of austenite (gamma) with carbon. PT of 390 degrees C and Pt of 500 s were recorded as the optimum values for PTs and Pts, which allowed the present steel to obtain higher formability and higher fracture strain characteristics, while retaining higher hardness and strength. The highest yield and tensile strength, hardness and fracture elongation were obtained for the sample partitioned at 390 degrees C for about 500 s, which were about 741 MPa, 1366 MPa, 322 HB and 25.2%, respectively.
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页码：525 / 533
页数：9
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