2022中國工模具材料及配件大全
合金元素對冷作模具鋼淬回火硬度的影響
藤松 威史·橫井 大円·辻井 信博
于 紅(譯)
(東北特殊鋼集團股份有限公司技術中心,遼寧大連 116105)
【摘要】研究了C、Cr、V合金元素對高碳高合金冷作模具鋼淬回火硬度的影響。①P值(P:-
137.5C+10.5Cr-8.75Mo +77.5V)是衡量Ms溫度變化的一個重要因素,是通過計算殘余奧氏
體量(γR)和淬火鋼的硬度(HQ)得到;②Ms溫度隨P值的增加呈線性遞增,γR的量則減少,HQ
值首先遞增,在P值約為-50時HQ達到峰值;③P值在-40和-70之間,通過合理設計C、Mo和
V的含量,與γ相固溶體得到高H(T HT:鋼的淬回火硬度),高HT通過少量的γR和充分的二次硬
化效果獲得的,主要是Mo和V的碳化物質(zhì)點的二次析出所產(chǎn)生的硬化效果;④通用冷作模
具鋼在常規(guī)奧氏體化溫度(1,323K)時,P值為-50 左右,HT可以達到64HRC以上。
關鍵詞:高碳冷作模具鋼;Ms溫度;殘余奧氏體;淬回火硬度;二次硬化
中圖分類號:TG162;TG142 文獻標識碼: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
近年來,隨著塑性加工技術的不斷進步,大力倡導
精品模具,近終形產(chǎn)品,用于制造螺栓、汽車部件等的
精細冷沖模材料由于硬度不足造成尺寸精度下降的問
題屢見不鮮。通過塑性變形均勻使組織均勻化的同
時,還要具有必要的強度和硬度。通過精細加工,對模
具材料保持高度的尺寸精度、抵抗磨損消耗的要求越
來越高,高的強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鋼SKD11淬回火硬度可以達到
60HRC以上,以滿足使用要求。從SKH51高速工具鋼
·合金元素對冷作模具鋼淬回火硬度的影響·
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