(1. 燕山大學(xué) 先進(jìn)鍛壓成型技術(shù)與科學(xué)教育部重點(diǎn)實(shí)驗(yàn)室，秦皇島 066004；
2. 燕山大學(xué) 河北省并聯(lián)機(jī)器人與機(jī)電系統(tǒng)實(shí)驗(yàn)室，秦皇島 066004；
3. 燕山大學(xué) 機(jī)械工程學(xué)院，秦皇島 066004)
摘 要: 依據(jù)不銹鋼復(fù)合板雙層金屬特性，制定真空熱軋成形316L/Q345R復(fù)合板熱處理工藝為高溫快速冷卻+低溫緩慢冷卻。采用電子顯微與能譜圖分析分別對(duì)熱處理前、后復(fù)合板試樣進(jìn)行顯微組織特征觀察和成分含量測(cè)定，研究復(fù)合界面顯微組織、相結(jié)構(gòu)和成分變化規(guī)律。采用剪切、拉伸及沖擊功試驗(yàn)對(duì)兩種狀態(tài)試樣進(jìn)行力學(xué)性能測(cè)試，研究顯微組織對(duì)力學(xué)性能的影響規(guī)律。結(jié)果表明：真空熱軋后的復(fù)合板能較好復(fù)合，熱軋?jiān)嚇又械秃辖痄搨?cè)組織為鐵素體和珠光體，力學(xué)性能較差，不銹鋼側(cè)析出Cr的碳化物較多；經(jīng)過熱處理后，試樣組織中有貝氏體出現(xiàn)，不銹鋼側(cè)Cr在加熱制度下重新固溶。熱處理實(shí)現(xiàn)復(fù)相化組織、合金元素界面擴(kuò)散等復(fù)合組織結(jié)構(gòu)的協(xié)同作用，從而大幅改善復(fù)合板的力學(xué)性能和耐腐蝕性能。
關(guān)鍵字: 不銹鋼復(fù)合板；真空熱軋成形；熱處理；顯微組織；力學(xué)性能
（1. Key Laboratory of Advanced Forging and Stamping Technology and Science, Ministry of Education,
Yanshan University, Qinhuangdao 066004, China;
2. Hebei Province Key Laboratory of Parallel Robot and Mechatronic System, Yanshan University,
Qinhuangdao 066004, China;
3. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China）
Abstract:According to the double layer metal characteristics of stainless steel clad plate, the heat treatment process, high temperature and rapid cooling and low temperature and slow cooling, for 316L/Q345R clad plate after vacuum hot rolling was formulated. Scanning electron microscope and energy spectrum analysis were used to investigate the microstructure, topography and constituent of clad plate specimens before and after heat treatment. The change rules of interface microstructure, phase structure and constituent were also studied. By applying shear, stretch and impact tests, the mechanical properties of specimens at two states were tested to investigate the relationship between the microstructure and mechanical properties. The results indicate that, after vacuum hot rolling, the clad plate can be successfully combined. The low alloy steel side microstructure of hot rolling sample consists of ferrite and pearlite, so, the mechanical property is poor. The precipitation of Cr carbide is more in the stainless steel side. After heat treatment, Bainite appears in the microstructure of sample, and Cr of the stainless steel side is dissolved again in the heating system. The heat treatment can achieve the synergistic effect of composite structures, such as duplex structure and interfacial diffusion of alloy elements, thus, greatly improve the mechanical properties and corrosion resistance of clad plates.
Key words: stainless steel clad plate; vacuum hot rolling; heat treatment; microstructure; mechanical property
