回火溫度對含鎢DIEVAR鋼組織和力學性能的影響
項少松1,2，吳日銘1,2，胡濤1,2，黃山1,2（1.上海工程技術大學材料工程學院，上海201600；2.上海市激光先進制造技術協同創新中心，上海201600）
摘要：由于W在鋼中具有優越的熱強性、熱硬性，對DIEVAR鋼添加質量百分比為1.0%的W，經真空感應熔煉、鍛打、退火后進行560℃和600℃的回火處理，再分別進行橫向沖擊、硬度和組織觀察。結果表明，W有效地提高了DIEVAR鋼600℃回火后的硬度和回火穩定性（2~3HRC），沖擊功相較DIEVAR鋼有小幅提升，JmatPro計算結果表明，W-DIEVAR鋼中形成了新的M2C和M7C3型碳化物，且掃描電鏡顯示W的添加抑制了DIEVAR鋼的M23C6型碳化物析出和長大，使含1.0%W試驗鋼的碳化物大小達到納米級別（20~200nm）。
關鍵詞：鎢；DIEVAR鋼；力學性能；析出相；熱擠壓
中圖分類號：TG156.5 文獻標識碼：B
文章編號：1001-2168（2021）06-0068-06 DOI：10.16787/j.cnki.1001-2168.dmi.2021.06.014
Effect of tempering temperature on microstructure and prop? erties of containing tungsten DIEVAR steel
XIANG Shao-song1,2, WU Ri-ming1,2, HU Tao1,2, HUANG Shan1,2 (1.School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201600, China; 2.Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201600, China)
Abstract: As W has superior thermal strength and thermal hardness in steel, 1.0% mass of W was added in DIEVAR steel. After vacuum induction melting, forging and annealing, the tempering temperature was selected at 560℃ and 600 ℃. The lateral impact energy, hardness and microstructure observation were carried out respectively. The results showed that tungsten effectively improved the hardness (2~3 HRC) and tempering stability of DIEVAR steel after 600 ℃ tempering, and the impact energy was slightly improved compared with DIEVAR steel. The calculation results of JmatPro software showed that new type carbide M2C and M7C3 were formed in W-DIEVAR steel. The scanning electron microscopy showed that the addition of W inhibited the precipitation and coarsening of M23C6 type carbides of DIEVAR steel, so that the carbide size of the test steel containing 1.0% W reached the nanometer level (20~200 nm).
Key words: tungsten; DIEVAR steel; mechanical properties; precipitates; hot extrusion