Htri Crack _hot_ [ Exclusive × 2026 ]

For alloy carbides (e.g., Cr₂₃C₆, Mo₂C):

[ \text{Fe}_3\text{C} + 4\text{H} \rightarrow 3\text{Fe} + \text{CH}_4(g) ] htri crack

HTHA, HTRI crack, hydrogen attack, decarburization, methane fissuring, Nelson curve, ultrasonic backscatter, Cr-Mo steel. 1. Introduction 1.1 Historical Context and Terminology High-Temperature Hydrogen Attack (HTHA) was first identified in the 1940s and 1950s in refinery hydroprocessing units. The term “HTRI crack” emerged from early collaborative research at the Heat Transfer Research Institute (HTRI) in California, where investigators documented intergranular cracking in carbon steel heat exchangers exposed to hydrogen at 400–500°C. However, “HTRI crack” is a misnomer; the correct metallurgical phenomenon is HTHA, and the term is now discouraged except in historical reference. For alloy carbides (e