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            熱鍛模具鋼的冷熱穩定性能對比

            來源:http://www.environmentandpeople.net/ 日期:2022-04-14 發布人:guanli


            H13模具鋼和3Cr2W8V模具鋼是我國目前使用非常廣泛的兩種鍛造模具鋼,其中H13模具鋼因良好的綜合力學性能及抗熱冷疲勞性能勝任一般熱模鍛造的需求。但由于H13模具鋼作為中耐熱型執作模具鋼,其工作溫度不宜超過600度,且淬透性差不利于制造大截面模具使用。
            H13 die steel and 3Cr2W8V die steel are two widely used forging die steels in China. Among them, H13 die steel is competent for general hot die forging due to its good comprehensive mechanical properties and hot and cold fatigue resistance. However, as H13 die steel is a medium heat-resistant executive die steel, its working temperature should not exceed 600 degrees, and its hardenability is poor, which is not conducive to the manufacture of large section dies.
            3Cr2W8V模具鋼是我國比較早的使用且應用更加廣的高強熱性熱鍛模具鋼,其熱穩定性良好,使用溫度可達650度,但因其冷熱疲勞性能和導熱性差,容易因冷熱疲勞而產生龜裂。而DM模具鋼為近幾年研發出的新型熱鍛模具鋼,通過3種熱鍛模具鋼熱穩定曲線的測定及微觀組織的觀察,對比分析3種鍛造模具鋼熱穩定性能的優劣及在熱穩定過程中微觀組織的變化。
            3Cr2W8V die steel is a high-strength hot forging die steel used earlier and more widely in China. It has good thermal stability and service temperature up to 650 degrees. However, due to its poor cold and hot fatigue performance and thermal conductivity, it is easy to crack due to cold and hot fatigue. DM die steel is a new type of hot forging die steel developed in recent years. Through the measurement of thermal stability curve and observation of microstructure of three kinds of hot forging die steel, the advantages and disadvantages of thermal stability of three kinds of forging die steel and the changes of microstructure in the process of thermal stability are compared and analyzed.
            3種實驗模具鋼均采用電渣重熔冶煉,其化學成分如表1所示,熱處理工藝及硬度值如表2所示,其中淬火加熱冷卻均在真空淬火爐中進行,等箱式回火爐穩定在實驗溫度下進行回火。熱穩定試驗的采用箱式爐分別將試樣在580、620、650度保溫24h,然后測試不同溫度下3種實驗鋼的洛式硬度值。采用發射掃描電鏡觀察試樣不同保溫溫度下的微觀組織,采用高分辨投射電子顯微鏡對不同保溫溫度下的試樣進行觀察,并標定碳化物的類型。
            The three kinds of experimental die steels are smelted by electroslag remelting, and their chemical composition is shown in Table 1. The heat treatment process and hardness value are shown in Table 2. The quenching, heating and cooling are carried out in the vacuum quenching furnace, and the tempering is carried out in the box tempering furnace when it is stable at the experimental temperature. In the thermal stability test, the samples were kept at 580, 620 and 650 ℃ for 24 hours in a box furnace, and then the Rockwell hardness values of three kinds of experimental steels at different temperatures were tested. The microstructure of the samples at different holding temperatures was observed by emission scanning electron microscope, and the samples at different holding temperatures were observed by high-resolution projection electron microscope, and the types of carbides were calibrated.
            結果表明:
            The results show that:
            (1)在580、620、650度保溫24h熱穩試驗中,DM模具鋼的硬度始終高于H13模具鋼和3Cr2W8V模具鋼;且隨著保溫溫度的升高,硬度前期下降的速度越快,后期均趨于平穩。
            (1) The hardness of DM die steel is always higher than that of H13 die steel and 3Cr2W8V die steel in the 24h thermal stability test at 580, 620 and 650 degrees; With the increase of holding temperature, the hardness decreases faster in the early stage and tends to be stable in the later stage.
            (2)在650度熱穩定過程中,3Cr2W8V模具鋼中存在W元素大量固溶于基體中,產生固溶強化作用,而DM模具鋼在熱穩定過程中由于亞穩相在高溫下分析出M2C型碳化物產生硬化現象,同時由于大量Mn元素固溶于基體,阻礙了馬氏體基體的回復,兩者相輔相成保證了其優越的熱穩定性能。
            (2) In the process of 650 degree thermal stability, a large amount of W element is dissolved in the matrix in 3Cr2W8V die steel, resulting in solid solution strengthening. In the process of thermal stability, DM die steel hardens due to the M2C carbide analyzed by metastable phase at high temperature. At the same time, a large amount of Mn element is dissolved in the matrix, which hinders the recovery of martensitic matrix. The two complement each other to ensure its superior thermal stability.
            以上就是為大家介紹的有關山東模具鋼的詳細介紹,希望對您有所幫助.如果您有什么疑問的話,歡迎聯系我們.我們將以專業的態度,為您提供服務http://www.environmentandpeople.net
            The above is the detailed introduction of Shandong die steel. I hope it will help you If you have any questions, please contact us We will provide you with professional service http://www.environmentandpeople.net

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