Mechanical & microstructural evaluation of reversible and irreversible embrittlement in ultra-high strength steel
| Autor: | Hira Younus, Jinglong Li, Zubia Anwer, Mohammad Nouman Siddiqui, Muhammad Samiuddin, Sumair Uddin Siddiqui |
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| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Reversible & irreversible temper embrittlement Materials science Alloy Charpy impact test 02 engineering and technology engineering.material Impact strength lcsh:Technology Industrial and Manufacturing Engineering Tensile strength 020901 industrial engineering & automation 0203 mechanical engineering Hardness Destructive testing Ultimate tensile strength General Materials Science Tempering Embrittlement Tempering temperature lcsh:T Metallurgy humanities 020303 mechanical engineering & transports Mechanics of Materials Martensite engineering Grain boundary |
| Zdroj: | International Journal of Lightweight Materials and Manufacture, Vol 3, Iss 3, Pp 250-257 (2020) |
| ISSN: | 2588-8404 |
| Popis: | This comprehensive study gives evidence of reversible and irreversible embrittlement in ultra-high-strength steel through destructive testing. Several tempering temperatures ranging from 350 °C to 700 °C were designated to observe temper embrittlement in the steel. Charpy impact, hardness, and tensile tests were performed for assessing the mechanical behavior of the steel. Stereo microscopy was utilized to examine the fractured surfaces and microstructural analysis was performed with the help of an optical microscope. During tempering, reversible temper embrittlement occurs due to the formation of alloy carbides between martensite plates while irreversible temper embrittlement is preferably due to the segregation of impurity elements (i.e. P and S) on grain boundaries as well as due to the coarsening of alloy carbides. It was found that irreversible temper embrittlement transpired when tempering was done in the range of 400–450 °C and reversible temper embrittlement occurred in 650–700 °C temperature range. Results of the notched-bar impact test clearly showed a reduction in impact toughness in susceptible temperature ranges; moreover, the revealed fracture surface and micrograph also validate these findings. Experimental results also validate that both types of embrittlement are detrimental to the mechanical properties owing to the decrease in hardness and tensile strength. |
| Databáze: | OpenAIRE |
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