Internal friction study on high silicon martensitic hot working die steel during tempering transformation
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摘要: 研究了含硅量為1.5%(質量分數)的高硅馬氏體型熱作模具鋼(SDH3)的內耗譜與顯微結構之間的關系.實驗用SDH3鋼采用1060℃保溫30min油冷淬火和不同回火工藝處理.試樣的溫度-內耗譜(TDIF)的測量在振動儀上進行,采用自由衰減法,測量溫度區間為室溫至750℃.實驗結果表明:SDH3鋼的TDIF譜線主要是Snoek峰和SKK峰這兩種機制的內耗峰;隨著回火溫度的升高,內耗峰峰高均逐漸降低,并且峰位也發生改變;當回火溫度達到650℃時,內耗峰完全消失而只剩下背景內耗;隨著回火保溫時間的延長,內耗峰峰高和峰位都發生變化,并從擴散控制再分配機理的角度對這些變化進行了分析討論.Abstract: A relationship between internal friction(IF) and microstructures of high silicon martensitic hot working die steel(SDH3 steel) which contains 1.5% silicon was researched.The experimental steel was annealed at 1060℃ for 30min,quenched into oil and tempered at different temperatures.The temperature dependence of internal friction(TDIF) was measured with a vibrating-reed apparatus by free decay method within the temperature range from room temperature to 750℃.It is shown that two types of relaxation IF peaks,Snoek peak and SKK peak,have been observed at TDIF curves of the steel.The height of IF peaks drops and the peak position shifts as the tempering temperature rises.When the tempering temperature is above 650℃,the IF peaks disappear completely and only background IF can be observed.As the tempering time is prolonged,both the peak height and peak position change,and then these changes have been discussed on the basis of diffusion-controlled redistribution.
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Key words:
- die steel /
- martensite /
- internal friction /
- silicon
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