2022中国工模具材料及配件大全
合金元素对冷作模具钢淬回火硬度的影响
藤松 威史·横井 大円·辻井 信博
于 红(译)
(东北特殊钢集团股份有限公司技术中心,辽宁大连 116105)
【摘要】研究了C、Cr、V合金元素对高碳高合金冷作模具钢淬回火硬度的影响。①P值(P:-
137.5C+10.5Cr-8.75Mo +77.5V)是衡量Ms温度变化的一个重要因素,是通过计算残余奥氏
体量(γR)和淬火钢的硬度(HQ)得到;②Ms温度随P值的增加呈线性递增,γR的量则减少,HQ
值首先递增,在P值约为-50时HQ达到峰值;③P值在-40和-70之间,通过合理设计C、Mo和
V的含量,与γ相固溶体得到高H(T HT:钢的淬回火硬度),高HT通过少量的γR和充分的二次硬
化效果获得的,主要是Mo和V的碳化物质点的二次析出所产生的硬化效果;④通用冷作模
具钢在常规奥氏体化温度(1,323K)时,P值为-50 左右,HT可以达到64HRC以上。
关键词:高碳冷作模具钢;Ms温度;残余奥氏体;淬回火硬度;二次硬化
中图分类号:TG162;TG142 文献标识码:B
DOI:10.12147/j.cnki.1671-3508.2022.02.024
Effects of Alloying Elements on Hardness of Quenched
and Tempered Cold Work Tool Steel
Yu Hong
(Technology Center of Dongbei Special Steel Group Co.,Ltd., Dalian, Liaoning 116105, CHN)
【Abstract】In this study, effects of C,Cr,Mo and V alloying on hardness of quenched and tempered
high carbon cold work tool steels were investigated and summary is as follows:①The P value
(P:-137.5C + 10.5Cr-8.75Mo + 77.5V) which is a useful factor to explain variations of Ms
temperature ,amount of retained austenite (γR) and hardness of quenched steel (HQ) is obtained;
②Ms temperature increased linearly with the P value. Accordingly, amount of γR decreased. HQ
increased with the P value up to -50 and showed the maximum at the point;③In the P value
between -40 and -70,it was expected that C,Mo and V formed an optimum balance of solid
solution with γ phase for acquisition of high HT(HT: the peak hardness of quenched and tempered
steel).And high HT will be obtained by low amount of γ R and sufficient second hardening
precipitates on a basis of Mo and V carbide;④Steels with the P value near -50 achieved High HT
over 64HRC under conventional austenitizing temperature (1,323K) of general cold work tool steels.
Key words:high carbon cold work tool steel;Ms temperature;retained austenite ;quenched and
tempered hardness ;second hardening precipitate
1 引言
近年来,随着塑性加工技术的不断进步,大力倡导
精品模具,近终形产品,用于制造螺栓、汽车部件等的
精细冷冲模材料由于硬度不足造成尺寸精度下降的问
题屡见不鲜。通过塑性变形均匀使组织均匀化的同
时,还要具有必要的强度和硬度。通过精细加工,对模
具材料保持高度的尺寸精度、抵抗磨损消耗的要求越
来越高,高的强度和耐磨性是模具材料的最基本要求,
具有代表性的冷作模具钢SKD11淬回火硬度可以达到
60HRC以上,以满足使用要求。从SKH51高速工具钢
·合金元素对冷作模具钢淬回火硬度的影响·
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