Preparation of Q235/CrWMn cutting tool material by composite casting and hot rolling
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摘要: 通過包覆澆鑄+熱軋變形工藝,制備了Q235/CrWMn鋼復合刀具材料,并用掃描電子顯微鏡(SEM)和維氏硬度儀分析了復合材料的界面組織、成分和性能的變化規律.實驗結果表明,通過真空冶煉澆鑄以及變形量超過90%的熱軋工藝,可以實現兩種組元金屬材料之間的冶金結合,其中Cr、W等元素的過渡層寬度僅為10～40μm.隨后的熱處理研究發現,復合材料在830±5℃保溫后空冷或者油淬時,Q235一側為珠光體+鐵素體組織,CrWMn一側為馬氏體組織,其硬度可達600～750HV,使復合刀具材料同時具有較好的韌性和強度.Abstract: A composite cutting tool material,consisting of Q235 and CrWMn steel,was prepared by composite casting and hot rolling process.Through vacuum melting and casting,followed by hot rolling deformation with a relative reduction larger than 90%,excellent metallurgical bonding between the component materials was obtained,with an interface layer of only 10 to 40 μm wide.Heat treatment experiments with different cooling modes were carried out.The results showed that after air cooling or oil quenching,a mixture microstructure of ferrite and pearlite in Q235 was formed.While in the side of CrWMn,a martensite structure with a micro hardness of 600 to 750 HV was found.The composite material exhibits the excellent comprehensive mechanical properties of both high toughness and strength.
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Key words:
- composite materials /
- cutting tool materials /
- composite casting /
- interface
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