Hardenability yog ntsuas ntau siv Jominy End-Quench (Jominy) Test (ISO 642 lossis ASTM A255). Lub bar txheem txheem (25 hli dia, 100 hli ntev) yog austenitized thiab ces quenched ntawm ib kawg nrog ib tug tswj dej dav hlau. Qhov no tsim ntau yam ntawm cov nqi cua txias raws lub bar. Tom qab ntawd lub hardness yog ntsuas ntawm lub caij nyoog los ntawm qhov kawg quenched.
Typical Jominy Curve for 42CrMo: The curve shows high hardness (~55-58 HRC) at the quenched end (J1, fast cooling, full martensite). The hardness decreases gradually with distance (slower cooling). Due to its high hardenability, 42CrMo maintains a high hardness level (e.g., >45 HRC) txawm nyob ntawm qhov deb tseem ceeb (xws li J20 lossis J30), qhia tias cov khoom ntim loj yuav hloov mus rau martensite txawm tias muaj qhov txias txias (xws li nyob hauv nruab nrab ntawm cov roj-quenched bar). Qhov tseeb nkhaus nyob ntawm qhov tseeb muaj pes tsawg leeg nyob rau hauv qhov kev teev tseg (ib "hardenability band").