Primary austenite
Primary austenite forms during solidification of undercooled steel from the melt. It is a fine, elongated, cubic crystal structure with low strength and high modulus of elasticity.
Physical-Chemical Mechanism of Action
Primary austenite forms during solidification of undercooled steel from the melt. It is a fine, elongated cubic crystal structure with low strength and high elastic modulus.
Metallurgical Relevance & Welding Risks
Primary austenite can form if cooling is too fast, leading to a coarser grain structure. This increases susceptibility to cracking and reduces steel toughness. It is especially dangerous in highly stressed components.
Workshop Practice & Action Guidelines
To avoid primary austenite, ensure controlled cooling after welding. Use suitable cooling aids and protect the weld from rapid air drafts. For highly stressed parts, slow, continuous cooling is essential.