Influence of Grain Size on Work-Hardening Behavior in 12Cr Stainless Steel

2016 ◽  
Vol 879 ◽  
pp. 2228-2233
Author(s):  
Masataka Yoshino ◽  
Chikara Kami
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Cold Rolling ◽  
Work Hardening ◽  
Reduction Rate ◽  
Recrystallization Annealing ◽  
Work Hardening Behavior ◽  
Fine Grained ◽  
Hardening Behavior ◽  
Fine Grained Steels

Grain refinement is attracting attention as a strengthening method which does not depend on the alloying elements added to steels. Many reports have described the manufacturing methods and mechanical properties of ultra-fine grained steels. In ultra-fine grained steels, it is well known that yielding stress drastically increases in accordance with the Hall-Petch relationship, while uniform elongation significantly decreases. These tendencies imply that grain size affects not only yielding but also work-hardening behavior. However, the influence of grain size on work-hardening behavior has not been clearly understood. Therefore, in this study, we investigated the work-hardening behavior during tensile deformation of 12Cr stainless steel with various grain sizes. Grain refining was conducted by cold-rolling of annealed and quenched steel specimens, followed by recrystallization annealing. The grain size of the specimens decreased as the cold-rolling reduction rate increased. The minimum grain size obtained by this method was approximately 5 μm. With decreasing grain size, 0.2% proof stress increased and the strain which reached the plastic instability condition decreased. In the session, we report the dislocation accumulation behavior estimated by grain hardness and XRD and the dynamic recovery behavior assessed by the Kocks-Mecking model.

scholarly journals Machining-Induced Work Hardening Behavior of Inconel 718 Considering Edge Geometries

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 397
Author(s):  
Bin Zhou ◽  
Weiwei Zhang ◽  
Zhongmei Gao ◽  
Guoqiang Luo
Keyword(s):  
Grain Size ◽  
Work Hardening ◽  
Inconel 718 ◽  
Orthogonal Cutting ◽  
Chip Thickness ◽  
Machined Surface ◽  
Work Hardening Behavior ◽  
Hardening Behavior ◽  
Significant Difference ◽  
Optimization Of Cutting Parameters

As a representative type of superalloy, Inconel 718 is widely employed in aerospace, marine and nuclear industries. The significant work hardening behavior of Inconel 718 can improve the service performance of components; nevertheless, it cause extreme difficulty in machining. This paper aims to investigate the influence of chamfered edge parameters on work hardening in orthogonal cutting of Inconel 718 based on a novel hybrid method, which integrates Coupled Eulerian-Lagrangian (CEL) method and grain-size-based functions considering the influence of grain size on microhardness. Orthogonal cutting experiments and nanoindentation tests are conducted to validate the effectiveness of the proposed method. The predicted results are highly consistent with the experimental results. The depth of work hardening layer increases with increasing chamfer angle and chamfer width, also with increasing feed rate (the uncut chip thickness). However, the maximum microhardness on the machined surface does not exhibit a significant difference. The proposed method can provide theoretical guidance for the optimization of cutting parameters and improvement of the work hardening.

Micro Hole Piercing for Ultra Fine Grained Steel

2014 ◽  
Vol 783-786 ◽  
pp. 2653-2658 ◽  
Author(s):  
Takafumi Komatsu ◽  
Hitoshi Kobayashi ◽  
Shiro Torizuka ◽  
Shinichi Nagayama
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Bulk Material ◽  
Functional Improvement ◽  
Flow Volume ◽  
Steel Coil ◽  
Fine Grained ◽  
Micro Hole ◽  
Different Grain Size ◽  
Fine Grained Steels

Ultra fine grained steels have been developed by many researchers. However, the study of influence on processes and product functions from different grain size are limited because the size of bulk material was small for these products. Authors have developed the production process of thin ultra fine grained stainless steel coil, and the effects are able to be clarified. This paper will firstly report the influence on micro hole piercing by comparing different grain size materials. Secondly, orifices are produced from these materials, and the liquid flow volume is measured as the functional effect of different grain size. The effects of grain size differences were discussed with observing the hole conditions and measuring flow volume. The effects of reduction of the grain size were summarized as follows: (1) Accurate small hole is produced when ultra fine grained stainless steel is employed. (2) Product functional improvement is possible, and the phenomena are useful for liquid control devices.

scholarly journals The Work Hardening Behavior and Some Other Properties of High Silicon Two-Phase Stainless Steel Wires

1974 ◽  
Vol 60 (6) ◽  
pp. 682-694 ◽  
Author(s):  
Tsuyoshi NISHIMURA ◽  
Tatsuya WAKAMIYA ◽  
Hiroshi HAYASHIDA ◽  
Yukio YAMAOKA
Keyword(s):  
Stainless Steel ◽  
Work Hardening ◽  
Two Phase ◽  
Work Hardening Behavior ◽  
Hardening Behavior ◽  
Steel Wires ◽  
High Silicon

Grain-size insensitive work-hardening behavior of Ag microwires

2019 ◽  
Vol 759 ◽  
pp. 655-660 ◽  
Author(s):  
Xiaocui Li ◽  
Haokun Yang ◽  
Fanling Meng ◽  
Jian Lu ◽  
Yang Lu
Keyword(s):  
Grain Size ◽  
Work Hardening ◽  
Work Hardening Behavior ◽  
Hardening Behavior

The Effect of Grain Size and Rolling Reduction on the Texture Development of a Metastable Austenitic Stainless Steel

2007 ◽  
Vol 558-559 ◽  
pp. 195-200
Author(s):  
S.Y. Han ◽  
R.L. Higginson ◽  
Eric J. Palmiere
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cold Rolling ◽  
Work Hardening ◽  
Metal Flow ◽  
Texture Development ◽  
Sheet Metals ◽  
Metastable Austenitic Stainless Steel ◽  
Hot Band

It is well known that the deformation and recrystallisation of metals and alloys are accompanied by changes in texture and microstructure. These changes can lead to anisotropy in metal flow and affect the formability of sheet metals. Therefore, a significant amount of research on the development of textures and the principles governing them has been conducted in recent years. One of the most important factors contributing to the texture development of materials is the initial grain size. Unlike other factors such as stacking fault energy, strain and deformation temperature, relatively little work has been carried out on the effect of grain size on texture development, even though a considerable understanding exists regarding the effect of grain size on work hardening and recrystallisation kinetics upon annealing. Hence, this research describes the effect of the initial hot band grain size on the development of texture during cold rolling and subsequent annealing.

Sign in / Sign up

Export Citation Format

Share Document