钼钨系高导热率热作模具钢高温性能

doi:10.11901/1005.3093.2016.037

材料研究学报

2017, Vol. 31

Issue (1): 32-40 DOI: 10.11901/1005.3093.2016.037

本期目录 | 过刊浏览

钼钨系高导热率热作模具钢高温性能

李爽^1,^2,³,吴晓春^1,^2,³(

),黎欣欣^1,^2,³,何西娟^1,^2,³

1 省部共建高品质特殊钢冶金与制备国家重点实验室上海 200072
2 上海市钢铁冶金新技术开发应用重点实验室上海 200072
3 上海大学材料科学与工程学院上海 200072

High Temperature Performance of a Mo-W Type Hot Work Die Steel of High Thermal Conductivity

Shuang LI^1,^2,³,Xiaochun WU^1,^2,³(

),Xinxin LI^1,^2,³,Xijuan HE^1,^2,³

1 State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200072,China
2 Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University,Shanghai 200072,China
3 School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

引用本文:

李爽,吴晓春,黎欣欣,何西娟. 钼钨系高导热率热作模具钢高温性能[J]. 材料研究学报, 2017, 31(1): 32-40.
Shuang LI, Xiaochun WU, Xinxin LI, Xijuan HE. High Temperature Performance of a Mo-W Type Hot Work Die Steel of High Thermal Conductivity[J]. Chinese Journal of Materials Research, 2017, 31(1): 32-40.

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摘要:

研究了新型Mo-W系热作模具钢材料的抗回火性能、热稳定性、高温热导率和热疲劳性能。结果表明：与Cr-Mo-V系的H13热作模具钢相比,SDCM-S热作模具钢的一些高温性能有明显的优势。SDCM-S模具钢具有更高的抗回火软化性能和热稳定性能。SDCM-S模具钢的二次硬化峰值温度出现在580℃左右,比H13钢高约60℃。SDCM-S模具钢在620℃保温20 h后硬度高于38HRC,比H13钢高9HRC。SDCM-S模具钢在回火过程中析出尺寸稳定的Mo2C碳化物,是其具有高抗回火软化性能和良好的热稳定性能的原因。SDCM-S模具钢具有高热导率。SDCM-S模具钢的热导率在100℃是H13钢的1.86倍,在700℃是H13的1.26倍。低Si,低Mn,低Cr以及高Mo含量,是其高热导率的原因。SDCM-S模具钢具有比H13钢更高的抗热疲劳性能。其热疲劳总损伤因子明显小于H13钢,只有H13钢疲劳损伤因子的76.1%。SDCM-S热作模具钢具有良好的抗回火软化能力,高温热稳定性,高温热导率。这些因素的共同作用,使SDCM-S材料有比H13钢更高的热疲劳性能。

关键词 ：金属材料, 热作模具钢, 二次硬化, 热导率, 热稳定性能, 热疲劳性能

Abstract：

The temper resistance,thermal stability,high temperature thermal conductivity and thermal fatigue were investigated for a new Mo-W type hot work die steel SDCM-S. The results show that in comparison with the convensional H13 steel,the SDCM-S exhibits better temper resistance and thermal stability with a hardnessabove 38HRC after holding at 620℃ for 20 h,which higher than H13 by 8HRC,wihle its second hardening temperature appeared at 580℃ which higher than H13 by approximately 60℃. The high temper resistance and thermal resistance of SDCM-S may be ascribed to the well stability of the precipitates of Mo₂C carbide during tempering. The thermal conductivity of SDCM-S is 1.86 times and 1.26 times higher than those of H13 at 100℃ and 700℃,respectively,which may be due to the low content of Si,Mn and Cr,as well as the high content of Mo of SDCM-S. The SDCM-S has better thermal fatigue resistance than H13 steel,i.e. the former one has a damage parameter of thermal fatigue of ca.76.1% of that of the later. In conclusion,SDCM-S has better performance in high temperature temper resistance,thermal stability,and thermal conductivity,which reasonably result in better thermal fatigue resistance of the steel SDCM-S.

Key words： metallic materials hot work die steel second hardening thermal conductivity temper resistance thermal stability thermal fatigue

收稿日期: 2016-01-06

基金资助:十三五国家重点研发项目(2016YFB0300400)

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表1 SDCM-S和H13钢的化学成分(质量分数, %)

图1 热疲劳测试系统示意图和疲劳试样的尺寸

图2 两种模具钢的回火硬度曲线

图3 SDCM-S模具钢淬火和回火组织的SEM照片

图4 M2C型碳化物的明场和暗场及衍射花样

图5 M6C型碳化物的明场和衍射花样

图6 两种模具钢在620℃保温20 h后的硬度-温度曲线

图7 SDCM-S模具钢在620℃保温一定时间后组织的SEM照片

图8 SDCM-S 钢在620℃保温20 h后的TEM照片

图9 SDCM-S和H13模具钢的比热容、热扩散系数和热导率随温度的变化

图10 SDCM-S模具钢和H13钢多次循环后的裂纹形貌

图11 热疲劳损伤因子的计算结果

图12 两种模具钢循环3000次后的显微硬度分布梯度

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