钒锶添加对5CrNiMo热作模具钢热疲劳性能的影响

Effect of Vanadium and Strontium Addition on Thermal Fatigue Properties of 5CrNiMo Hot Work Die Steel

采用不同的钒锶添加量及钒添加方式,制备了5Cr Ni Mo-V-Sr热作模具钢试样,并进行了热疲劳性能的测试与分析。结果表明:钒锶添加量及钒添加方式均对试样热疲劳性能产生影响;与不添加钒锶相比,添加0.5%V-0.5%Sr试样的热疲劳裂纹级别由7级变为2级,热疲劳性能得到明显改善;与Fe V40合金添加方式相比,以纯金属钒添加方式制备的试样热疲劳裂纹级别由3级变为2级,热疲劳性能得到提高。5Cr Ni Mo热作模具钢的钒和锶添加量均应优选为0.5%,钒的添加优选为纯金属钒添加方式。

5 CrNiMo hot work die steel samples were produced with various amounts of vanadium(V)and strontium(Sr) as well as different adding modes of vanadium,thermal fatigue properties of the samples were tested and analyzed.The results show that both the amount of V and Sr and the adding mode of V have an effect on the thermal fatigue properties of the samples. Comparing with the sample without V and Sr,the thermal fatigue crack grade of the sample with 0.5% of V and 0.5% of Sr changes from 7 to 2,and the thermal fatigue properties have an obvious improvement. The thermal fatigue crack grade of the sample by adding pure vanadium metal changes from 3 to 2 with the thermal fatigue properties improved,in comparison to the sample by adding Fe V40 alloy.The optimum addition amount for both of V and Sr is0.5%,and it’s better to add pure vanadium metal into the 5 CrNiMo hot work die steel.