摘要
用WC-Co型硬质合金和高合金钢以不同的匹配方式制作冷冲模具,对高硬度材料2Cr13不锈钢进行冲裁,发现以高合金钢制作的模具寿命远高于硬质合金制作的模具。其失效方式及所占比例表明,硬质合金主要以掉渣和崩刃为主,而高合金钢以正常磨损为主。分析可知,由于剧烈磨损而引起WC-Co型硬质合金Co的缺失,破坏了WC骨架,最终导致模具局部韧性不足而掉渣;而高合金钢韧性相对较好,延长了使用寿命,但同时由于热加工工艺的不适当导致碳化物不均或硬度不稳定而未充分发挥材料的潜能,对提高高合金钢的使用寿命给出了改进方案。
The high hardness material 2Crl 3 stainless steel was punched with the mould made by YG cemented carbide or high alloy steel respectively or the combination of the twos, and it is found that the service life of high alloy steel is much higher than that of cemented carbide. The data of failure mode show that cemented carbide is disabled mainly for shedding dregs, while the high alloy steel fails mostly by normal wear. Through microscopic analysis, Co removing from WC-Co cemented carbide during severe friction causes the disruption of WC skeleton, eventually leading to low toughness and brittleness in local area. On the contrary, the higher toughness of high alloy steel relatively prolongs service life, except for the uneven distribution of carbonization and the unstable hardness due to the inappropriate thermal processing technology. The improvement program on the service life of high alloy steel was given.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2012年第5期83-86,共4页
Ordnance Material Science and Engineering
