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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Thermal Fatigue Testing of Plasma Transfer Arc Stellite Coatings on Hot Work Tool Steels under Steel Thixoforming Conditions
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Thermal Fatigue Testing of Plasma Transfer Arc Stellite Coatings on Hot Work Tool Steels under Steel Thixoforming Conditions

机译：钢触变成形条件下热作工具钢上等离子转移电弧星状涂层的热疲劳测试

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摘要

The thermal fatigue performance of Stellite 12 coating deposited on X32CrMoV33 hot work tool steel via the plasma transfer arc (PTA) process was investigated under steel thixoforming conditions. Stellite 12 coating has made a favorable impact on the thermal fatigue performance of the X32CrMoV33 hot work tool steel. The latter survived steel thixoforming conditions lasting much longer, for a total of 5000 cycles, when coated with a PTA Stellite 12 layer. This marked improvement is attributed to the higher resistance to oxidation and to temper softening of the Stellite 12 alloy. The Cr-rich oxides, which form during thermal cycling, provide adequate protection to high-temperature oxidation. In contrast to hot work tool steel, Stellite 12 alloy enjoys hardening upon thermal exposure under steel thixoforming conditions. This increase in the strength of the coating is produced by the formation of carbides and contributes to the superior thermal fatigue resistance of the Stellite 12 alloy. When the crack finally initiates, it propagates via the fracture of hard interdendritic carbides. The transformation of M_7C_3 to M_(23)C_6, which is more voluminous than M_7C_3, promotes crack propagation.
机译：在钢触变成形条件下，研究了通过等离子转移弧（PTA）工艺在X32CrMoV33热作工具钢上沉积的Stellite 12涂层的热疲劳性能。 Stellite 12涂层对X32CrMoV33热作工具钢的热疲劳性能产生了有利影响。当涂有PTA Stellite 12层时，后者在钢的触变成型条件下可存活更长的时间，共进行5000次循环。这种显着改善归因于Stellite 12合金具有更高的抗氧化性和回火软化性。在热循环过程中形成的富铬氧化物可为高温氧化提供足够的保护。与热作工具钢相比，Stellite 12合金在钢触变成形条件下受热后会硬化。涂层强度的这种提高是通过形成碳化物而产生的，并有助于Stellite 12合金具有出色的耐热疲劳性。当裂纹最终开始时，它会通过坚硬的树枝状碳化物的断裂而扩展。从M_7C_3到M_（23）C_6的转换比M_7C_3的转换量大，从而促进了裂纹扩展。

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