The Reliability of Single-Step and Double-Step Quench and Partitioning Heat Treatments on an AISI 420A Low Carbon Martensitic Stainless Steel

被引：6

作者：

Barella, S. ^{[1
]}

Gruttadauria, A. ^{[1
]}

Menezes, J. T. O. ^{[1
]}

Castrodeza, E. M. ^{[1
]}

Quaini, S. E. ^{[1
]}

Pelligra, C. ^{[2
]}

McNally, E. A. ^{[2
]}

机构：

[1] Politecn Milan, Dept Mech Engn, Via G Masa 34, I-20156 Milan, MI, Italy

[2] McMaster Univ, Dept Mat Sci & Engn, 1280 Main St West,JHE 357, Hamilton, ON, Canada

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2023年 / 54卷 / 10期

关键词：

REVERSED AUSTENITE; FRACTURE-TOUGHNESS; LATH MARTENSITE; TRANSFORMATION; CRYSTALLOGRAPHY; MICROSTRUCTURE; STABILIZATION; TEMPERATURE; MORPHOLOGY;

D O I：

10.1007/s11661-023-07145-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructural and mechanical effects of various single-step (SS) and double-step (DS) quench and partition (Q & P) heat treatments applied to an AISI 420A low carbon martensitic stainless steel (MSS) has been studied. The goal with this work is to reach a total elongation (E pct) of 12 pct and an ultimate tensile strength (UTS) above 1200/1300 MPa, but ultimately to achieve a superior strength-ductility balance in comparison to its traditional Quench and Temper (Q & T) counterpart. This is being done by retaining austenite within the steel's martensitic matrix at room temperature (RT) using novel SS and conventional DS Q & P heat treatments. Considerable work has been done to optimize DS Q & P heat treatments, but little has been done to understand the effects of removing a subsequent heating cycle through SS Q & P heat treatments has on MSSs. With that being said, partitioning is performed at the same quench interruption temperature for the SS Q & P heat treatments, and reheated to a higher temperature for the DS Q & P heat treatments. Experimental investigations were carried out on 1 mm thick, sheet samples to increase the number of potential applications for this steel and heat treatment. The microstructure of different SS and DS Q & P heat treatments was investigated through X-ray diffraction (XRD) and transmission electron microscopy (TEM) while mechanical property investigations were carried out using tensile and fracture toughness testing. DS Q & P heat treated samples quenched to 130 & DEG;C and partitioned for industrially relevant times of 10 and 30 minutes featured the highest values in terms of total elongation, tensile strength and fracture toughness. The SS Q & P heat treatments, on the other hand, were able to achieve improved mechanical properties to its Q & T counterpart. Overall, this work opens up the possibility of increased MSS usage for reliable, thin-walled component production with improved properties through Q & P heat treatment methods. The best results achieved in this study are a UTS of 1585 MPa, E pct of 22 pct, and a fracture toughness of 77 kJ/m(2). Their lower total elongation of 9.6 pct is balanced by high tensile strength of 1812 MPa, ensuring higher toughness compared to traditional Q & T samples.

引用

页码：3957 / 3972

页数：16