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高速钢的回火通常是540°～560℃的高温回火(H)。所谓LHH回火法,是指在320°～380℃的低温回火(L)之后,进行两次高温回火(HH)。LHH回火能改善碳化物的分布及均匀性,因此,LHH回火件的硬度高于高温回火件,冲击值也有所提高。本文拟对性能改善与显微组织的关系加以说明。(1) 机械性能T1钢(SKH2)和M2钢(SKH51)通过LHH回火,硬度可提高0.5～2HRC,冲击值
High speed steel tempering is usually 540 ° ~ 560 ℃ tempering (H). The so-called LHH tempering method, refers to the 320 ° ~ 380 ℃ low temperature tempering (L), the two high-temperature tempering (HH). LHH tempering can improve the carbide distribution and uniformity, therefore, LHH tempering hardness higher than the high temperature tempering, the impact value has also increased. This article intends to explain the relationship between performance improvement and microstructure. (1) Mechanical Properties The hardness of T1 steel (SKH2) and M2 steel (SKH51) can be increased by 0.5 ~ 2HRC after LHH tempering, and the impact value