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Nitrogen Martensite Strengthening

Nitrogen martensite strengthening increases the hardness and tensile strength of martensite through interstitially dissolved nitrogen, similar to carbon.

Physical-Chemical Mechanism of Action

Nitrogen is absorbed in martensite as an interstitial element. This alters the crystal structure and tightens atomic spacing, increasing hardness.

Metallurgical Relevance & Risks in Welding

Too high nitrogen content distribution can lead to overly hard martensite, reducing formability and toughness. This can cause cracks and fractures in the material.

Workshop Practice & Action Instructions

Make sure the nitrogen content in the weld pool stays below 0.1 %. For high-strength steels with martensitic structure, use slow cooling and control nitrogen absorption.

MetallurgieSchweißtechnik

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