摘要
研究了W12Mo3Cr4V3N超硬型高速钢(即“V 3 N”钢)的静弯曲和冲击(夏氏、无缺口)性能与热处理工艺方法和参数之间的关系。用硬度-强度和硬度-静弯或冲击功的配合水平衡量工艺的合理性。当硬度要求为HRC 62以上时,应采用二次硬化(560℃回火)工艺。“低淬低回”仅在硬度要求HRC62以下时才适用。当要求HRC 69或更高时,可采用冷处理,使达到超高硬度时脆化程度最小。贝氏体等温处理和正常淬火后的中温(350℃左右)回火并不是提高综合性能的有效方法。测定了不同温度回火后的弹性模量,发现在二次硬化初期(500—520℃回火)有一个E 值最低区间。最后,给出了工业电弧炉生产的V 3 N 钢的硬度和强度、韧性范围。
The relationship between static bending and impact(Charpy,unnotched)proper-ties of superhard high speed steel W12Mo3Cr4V3N(i.e.the“V3N”steel)and the parame-ters of heat treatment has been studied.The reasonability of heat treatment process was measuredwith the corresponding level of hardness-strength and hardness-accumulating energy beforefracture.When the required hardness is higher than HRC 62,it is reasonable to use the secondaryhardening process(560℃ tempering).The so-called“low hardening low tempering”process is onlyreasonable if the required hardness is below HRC 62.Bainite isothermal treatment and the mid-temperature tempering(about 350℃)after normal quenching is not suitable.When required hard-ness is HRC 69 or more,the sub-zero treatment can be used to decrease the embrittlement atsuperhard state.The elastic modulus under various tempering temperature was surveyed and it wasfound that a minimum value of E during tempering at the start stage of secondary hardening(500-520℃).
出处
《机械工程材料》
CAS
CSCD
1989年第3期8-12,共5页
Materials For Mechanical Engineering
