← Glossary

Martensite Start Temperature Formula

The martensite start temperature formula calculates the temperature at which austenite transforms to martensite, depending on carbon content. Too high temperatures lead to glass-hard martensite with high crack risk.

Physicochemical Mechanism of Action

The martensite start temperature (Ms) is the temperature at which austenite transforms to martensite. This transformation is diffusionless and depends strongly on carbon content.

Metallurgical Relevance & Welding Risks

If cooling is too fast (temperature below Ms), glass-hard martensite forms, making the material crack-sensitive. This can lead to hot cracks and low toughness.

Shop Practice & Action Guidelines

To minimize risks, cooling should be controlled to keep the temperature above Ms. This can be achieved by choosing the right welding process and the correct cooling strategy.

MetallurgieSchweißtechnik

AI Transparency (EU AI Act): Created on the basis of our own many years of practical experience in welding technology, with the help of AI, and reviewed editorially.

© 2026 Welder-World. All content is for training and continuing education and does not replace a certified welding procedure specification.