Analysis of hardenability effect of boron

Lin, Hong-Rang; Cheng, Gwa-Hwa

doi:10.1179/mst.1990.6.8.724

Cited by 8 publications

(1 citation statement)

References 7 publications

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“…The high concentration of solute boron in the austenite grain boundary efficiently obstructs the nucleation of ferrite grains below equilibrium transformation temperature, thus preserving metastable austenite down to martensite-start temperature. Since boron tends to precipitate with free nitrogen at lower austenite temperatures, it is usually protected by titanium microalloying [44]. Titanium has a much higher affinity to nitrogen.…”

Section: Microalloying In Martensitementioning

confidence: 99%

Property Optimization in As-Quenched Martensitic Steel by Molybdenum and Niobium Alloying

Mohrbacher

2018

Metals

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Niobium microalloying is the backbone of modern low-carbon high strength low alloy (HSLA) steel metallurgy, providing a favorable combination of strength and toughness by pronounced microstructural refinement. Molybdenum alloying is established in medium-carbon quenching and tempering of steel by delivering high hardenability and good tempering resistance. Recent developments of ultra-high strength steel grades, such as fully martensitic steel, can be optimized by using beneficial metallurgical effects of niobium and molybdenum. The paper details the metallurgical principles of both elements in such steel and the achievable improvement of properties. Particularly, the underlying mechanisms of improving toughness and reducing the sensitivity towards hydrogen embrittlement by a suitable combination of molybdenum and niobium alloying will be discussed.

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Section: Microalloying In Martensitementioning

confidence: 99%

Property Optimization in As-Quenched Martensitic Steel by Molybdenum and Niobium Alloying

Mohrbacher

2018

Metals

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Nano‐SIMS investigation of boron distribution in steels

Valle¹,

Drillet

Pic

et al. 2011

Surface & Interface Analysis

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aThe introduction of boron in amounts of tens parts per million (ppm) increases the hardenability of steels. Nevertheless, this positive effect of boron can drastically be reduced during the industrial process if boron precipitation occurs. In order to identify the different steps of boron precipitation for the main parts of the process (deformation at high temperature, cooling and welding), the distribution of boron in high strength steels is studied through SIMS nano-analysis. It is shown that the B state and the nature of the B precipitates can be directly deduced from different ion maps ( 11 B, 12 C, 11 B 12 C, 11 B 14 N, 11 B 16 O) acquired simultaneously. Depending on the progress of the process, borocarbides and boron nitrides precipitates are observed.

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