回火对Cr4Mo4V钢电子束Cr合金化层组织和性能的影响  

Effect of tempering on microstructure and properties of Cr alloyed layer prepared by high current pulsed electron beam on Cr4Mo4V steel

作　　者：刘兆宾 周丽娜 罗甸 李学问 Liu Zhaobing;Zhou Lina;Luo Dian;Li Xuewen-(Capital Aerospace Machinery Company,Beijing 100076,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin Heilongjiang 150001,China;AECC Harbin Bearing Co.,Ltd.,Harbin Heilongjiang 150025,China;School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin Heilongjiang 150080,China)

机构地区：[1]首都航天机械有限公司,北京100076 [2]哈尔滨工业大学金属精密热加工国防科技重点实验室,黑龙江哈尔滨150001 [3]中国航发集团哈尔滨轴承有限公司,黑龙江哈尔滨150025 [4]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150080

出　　处：《金属热处理》2020年第8期194-198,共5页Heat Treatment of Metals

基　　金：国防科技重点实验室基金(614290903040617)。

摘　　要：研究了Cr4Mo4V钢电子束Cr合金化层结构随回火温度及时间变化的演化规律。采用XRD和TEM研究了Cr合金化层在回火过程中的物相变化,采用纳米硬度计和电化学工作站分别测试了Cr合金化层硬度和耐蚀性随回火温度的变化。结果表明,回火过程中纳米级碳化物从合金化层中析出,使合金化层硬度增加,随着回火时间和温度的增加,碳化物发生长大,硬度随之降低。碳化物的析出会导致基体Cr元素的下降,耐蚀性降低,但仍优于原始Cr4Mo4V钢。Microstructure evolution law of Cr alloyed layer prepared by electron beam on Cr4Mo4V steel with different tempering time and temperatures was studied.Effect of tempering process on the phase transformation of Cr alloyed layer was analyzed by means of XRD and TEM,and the hardness and corrosion resistance of tempered Cr alloyed layer were tested by nanoindenter and electrochemical workstation,respectively.The results show that nano-scale carbides precipitate in the alloyed layer during tempering process,results in the increase of the hardness.However,the carbides gradually coarsen and the hardness decreases as the tempering time and temperature increase.The reduction of Cr content caused by carbides precipitation leads to a decrease of corrosion resistance,however,which is still superior to the Cr4Mo4V steel matrix.

关 键 词：Cr4Mo4V钢 强流脉冲电子束合金化 回火 硬度 耐蚀性 

分 类 号：TG162.83[金属学及工艺—热处理]