采用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）等研究了淬火-配分（Q&P）热处理后30Cr13模具钢的物相组成和显微组织的演变规律，并利用动电位极化法对不同工艺热处理的模具钢在3.5%（质量分数）NaCl水溶液中的腐蚀行为进行了分析。结果表明：220Q盐浴淬火试样和220P一步法淬火-配分热处理试样的残余奥氏体体积分数小于3%，随着二步法淬火-配分热处理中配分温度从300℃上升至500℃，30Cr13模具钢的残余奥氏体含量呈现先增加而后降低的趋势，在配分温度为400℃时取得最大值；220Q和220P试样的组织都由板条状马氏体组成，经过二步法淬火-配分热处理后，模具钢的基体组织也由板条马氏体组成，此外在马氏体板条间有白亮条状或者颗粒状M₃C型碳化物出现；不同淬火-配分热处理的30Cr13模具钢的耐均匀腐蚀性能差别不大；二步法淬火-配分热处理模具钢试样的点蚀电位高于盐浴淬火试样和一步法淬火-配分热处理试样的。

The phase composition and microstructure evolution of die steel 30Cr13 after quenching and partitioning (Q&P) heat treatment were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM). And the corrosion behavior of the die steel treated in different heat treatment processes was analyzed in 3.5% (mass) NaCl solution by method of dynamic potential polarization. The results show that residual austenite content in 220Q sample quenched in salt bath and 220P sample treated by one-step Q&P heat treatment were smaller than 3% (volume). When the partitioning temperature in two-step Q&P process rose from 300℃ to 500℃, the content of residual austenite in the die steel increased first and then decreased, and got the maximum value when the partition temperature was 400℃. The microstructure of 220Q and 220P samples was composed of lath martensite. The microstructure of samples after Q&P heat treatment was also composed of lath martensite, and there were white bright bar or granular M₃C carbides between martensite laths. The difference between uniform corrosion resistance of the die steels treated in different Q&P processes was little. The two-step Q&P treated die steel samples had higher pitting potential than salt bath quenched sample and one-step Q&P treated sample.