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Heat treatment characteristics of different materials during

Gear heat treatment is an extremely important process, the complexity of the gear is doomed to high requirements for materials, different gear materials for metal heat treatment, its characteristics are completely different, then the following to introduce the characteristics of different materials heat treatment.


Heat treatment characteristics of different materials during

Metal heat treatment

Hardenability

Meaning: the ability of steel to undergo martensitic quenching and the ability of different steels to undergo quenching.
 The hardenability of steel with different hardenability is different, and the depth of hardenability layer is different after quenching, so the metallographic structure and mechanical properties along the section distribution are different. The depth of the hardener layer is the depth from the martensite to the 50% martensite layer. All hardened workpieces usually have residual tensile force on the surface, which is prone to deformation and cracking, and is not conducive to the fatigue performance of the work.

Design considerations:

1. The larger the size of the part, the greater the internal heat capacity, the slower the cooling rate of the part when quenching. Therefore, the thinner the hardened layer, the worse the performance. This phenomenon is called "the size effect of steel". Therefore, the hardenability of steel must be considered instead of being used to calculate the strength of large-sized parts according to Small-size performance data.
 2. The gears with large cross-section or complex structure are made of multi-element alloy steel to ensure adequate and appropriate hardenability, to ensure good comprehensive mechanical properties along the entire cross-section, and to reduce deformation and prevent cracking.
 3. For carbon steel gears, due to the low hardenability of carbon steel, the normalizing and tempering effects are similar in the design of large sizes, while the normalizing can reduce the cost and do not require tempering.
 4. high modulus gears are quenched and tempered due to the hardenability of steels.

Hardenability

Meaning: refers to the steel under normal quenching conditions, to exceed the critical cooling rate formed martensite structure can reach the highest hardness.
 The main points in design are: hardenability and hardenability, which mainly depend on the carbon content in the steel. The higher the carbon content in the steel, the higher the hardness after quenching, but not much related to the alloy element. Therefore, high hardness steel may not necessarily have high hardenability, but low hardness steel may also have high hardenability.

overheating sensitivity

Meaning: refers to the steel under normal quenching conditions, to exceed the critical cooling rate formed martensite structure can reach the highest hardness.
 The main points in design are: hardenability and hardenability, which mainly depend on the carbon content in the steel. The higher the carbon content in the steel, the higher the hardness after quenching, but not much related to the alloy element. Therefore, high hardness steel may not necessarily have high hardenability, but low hardness steel may also have high hardenability.

Temper stability

Meaning: refers to the steel under normal quenching conditions, to exceed the critical cooling rate formed martensite structure can reach the highest hardness.
 The main points in design are: hardenability and hardenability, which mainly depend on the carbon content in the steel. The higher the carbon content in the steel, the higher the hardness after quenching, but not much related to the alloy element. Therefore, high hardness steel may not necessarily have high hardenability, but low hardness steel may also have high hardenability.

Deformation cracking tendency

Meaning: It refers to the tendency of deformation and cracking of steel caused by thermal stress and microstructural stress during heating and cooling, whose combined effect exceeds_s or_b of steel.
 The design considers the key points: heating or cooling speed is too fast, heating and cooling uneven are easy to cause deformation and even cracking of the workpiece.

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