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HTT 110 · Metal Heat Treatment

Session 3 · Hour 1 · Hard is not kind

Instructor cue 자랑은 인성이 아니다.

90 minNow Open · 5 min left · next Demo

Hard is not kind

Desk 53 · HTT 110 · booth

Hold the heat.

hardtough

One fight only. A hatch may want both.

Name hardness and toughness as two fights

0/6

  • Yield. The first lasting bend.

  • Tensile. The last pull before the break.

  • Hardness. A fight against a small dent.

  • Toughness. A fight against a sudden break.

  • Ductility. Stretch before you snap.

  • A number without a unit is a rumor.

CheckRead a test sheet. Sort strength, hardness, toughness, stretch. Compare a heat before and after. Say if the balance fits the job. Do not invent a hardness number. Harder is not always better. A visor for a break test. A coupon that walks is a wound.