研究了热冲压模具用SDK1钢的时效硬化规律、力学性能、热稳定性能和热导率.结果表明:经过固溶时效处理后,SDK1钢的硬度高于优质H13钢,冲击功与H13钢很接近.处于最佳热处理状态下的SDK1钢在620℃下保温20h后,硬度比H13钢约高8HRC.透射电镜观察发现,SDK1钢的时效硬化主要依靠析出弥散的纳米级Cu和NiA1相,而在620℃下保温20 h后Cu和NiA1相的长大不明显,这是其具有较高的热稳定性能的原因.在100-700℃范围内SDK1钢的热导率显著比H13的高,这与SDK1钢的低Si、Cr合金成分配比有密切的关系.
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