تأثير تخمير التكوير والتقسية السطحية باللهب على القساوة والبنية المجهرية للفولاذ الكربوني
Abstract
FLAME HARDENING is a heat-treating process in which a thin surface shell of a steel part is heated rapidly to a temperature above the critical point of the steel. After the grain structure of the shell has become austenitic, the part is quickly quenched, transforming the austenite to martensite while leaving the core of the part in its original state. To achieve hardness, the steel must be cooled rapidly so that it bypasses the first two transformation phases and transforms directly from austenite to martensite. Flame hardening employs direct impingement of a high-temperature flame or high-velocity combustion product gases. Depths of hardening from about 0.8 to 6.4 mm or more can be obtained, depending on the fuels used, the design of the flame head, the duration of heating, the hardenability of the work material, and the quenching medium and method of quenching used. Although flame hardening is mainly used to develop high levels of hardness for wear resistance, the process also improves bending and torsional strength and fatigue life
In this research we study the effect of flame hardening and prior soft annealing on 0.6% carbon steel microstructure, hardness and hardness depth.
يهدف هذا البحث إلى دراسة تأثير التقسية السطحية باللهب على القساوة والبنية المجهرية للفولاذ الكربوني 0.6%) كربون) ودراسة تأثير تخمير التكوير السابق للتقسية على القساوة والبنية المجهرية للفولاذ الكربوني كذلك. حيث تمت دراسة التغيرات الحاصلة على البنية البلورية والقساوة السطحية وعمق التقسية مع وبدون تخمير التكوير لمعرفة التغيرات الحاصلة ومقارنة النتائج.
فقد بين البحث تأثير التقسية السطحية باللهب على كل من البنية البلورية والقساوة السطحية وعمق التقسية للفولاذ المستخدم في البحث، للحصول على مزيج فريد من الخواص، من سطح قاسي مقاوم للاحتكاك وقلب مرن مقاوم للصدم.
كما أشار إلى تحسن هذه الخواص عند إجراء عملية تخمير التكوير للفولاذ قبل عملية التقسية المذكورة.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2019 ttps://creativecommons.org/licenses/by-nc-sa/4.0/
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
The authors retain the copyright and grant the right to publish in the magazine for the first time with the transfer of the commercial right to Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series
Under a CC BY- NC-SA 04 license that allows others to share the work with of the work's authorship and initial publication in this journal. Authors can use a copy of their articles in their scientific activity, and on their scientific websites, provided that the place of publication is indicted in Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series . The Readers have the right to send, print and subscribe to the initial version of the article, and the title of Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series Publisher
journal uses a CC BY-NC-SA license which mean
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
- The licensor cannot revoke these freedoms as long as you follow the license terms.
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- NonCommercial — You may not use the material for commercial purposes.
- ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
