Effect Mechanism of Twin-Stage Nitriding Process on Service Life of Extrusion Die

Zhang Jianping

doi:10.15980/j.tzzz.2013.06.021

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Effect Mechanism of Twin-Stage Nitriding Process on Service Life of Extrusion Die
Vol. 33, Issue 6, Pages: 535-537(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.06.021

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[1]张建平.双级氮化对挤压模具寿命的影响[J].特种铸造及有色合金,2013,33(06):535-537.

Zhang Jianping. Effect Mechanism of Twin-Stage Nitriding Process on Service Life of Extrusion Die. [J]. Special Casting & Nonferrous Alloys 33(6):535-537(2013)
[1]张建平.双级氮化对挤压模具寿命的影响[J].特种铸造及有色合金,2013,33(06):535-537. DOI： 10.15980/j.tzzz.2013.06.021.

Zhang Jianping. Effect Mechanism of Twin-Stage Nitriding Process on Service Life of Extrusion Die. [J]. Special Casting & Nonferrous Alloys 33(6):535-537(2013) DOI： 10.15980/j.tzzz.2013.06.021.

摘要

通过硬度比较、微观组织观察、断裂机理分析

探索了双级氮化与传统氮化工艺对模具寿命的影响

研究了双级氮化延长模具寿命的机理。结果表明

双级氮化的硬度（HK）高于常规氮化工艺100

氮化层比普通氮化工艺厚50μm。白亮层厚度

普通氮化工艺为1.4μm

双级氮化为3.9μm。粗大的偏析相和未完全溶解的粗大碳化合物造成内应力

是导致裂纹源和模具损坏的重要因素。双级氮化模具平均寿命比普通氮化长2t

即双级氮化模具比普通氮化模具产出的铝型材多2t。

Abstract

Effects of twin-stage nitriding and conventional nitriding process on service life of die were analyzed comparatively by hardness testing

microstructure and fracture morphology. The mechanism of twin-stage nitriding improving service life of die was described. Die hardness in twin-stage nitriding is 100 higher than that in conventional nitriding

and nitriding layer is thicker than 50 μm. Twin-stage white layer thickness is 3.9 μm

while conventional hite layer thickness is 1.4 μm. Segregation phase and carbon compound result in the occurrence of internal stress

which is responsible for the crack and die failure. Service life of twin-stage nitriding die is increased by 2 t compared with that of conventional nitriding die.