CAJ | 학술논문

讨论了焊后热处理对TiAl合金与40Cr热轧钢摩擦焊接头显微组织及力学性能的影响。焊态下，钢侧界面层附近发生马氏体转变，界面层中碳原子富集生成TiC，降低了接头的力学性能；TiAl合金侧形成了羽毛状及魏氏体组织。经580°C和630°C保温2 h焊后热处理，界面层附近形成回火索氏体组织，碳弥散分布，接头的抗拉强度由焊态时的86 MPa分别提高至395 MPa和330 MPa。焊态下，接头沿界面层断裂；热处理后，接头呈准解理断裂，断裂位置位于TiAl合金侧，距界面层约1 mm。
토론료한후열처리대TiAl합금여40Cr열알강마찰한접두현미조직급역학성능적영향。한태하，강측계면층부근발생마씨체전변，계면층중탄원자부집생성TiC，강저료접두적역학성능；TiAl합금측형성료우모상급위씨체조직。경580°C화630°C보온2 h한후열처리，계면층부근형성회화색씨체조직，탄미산분포，접두적항랍강도유한태시적86 MPa분별제고지395 MPa화330 MPa。한태하，접두연계면층단렬；열처리후，접두정준해리단렬，단렬위치위우TiAl합금측，거계면층약1 mm。
Direct friction welding of TiAl alloy to 40Cr steel rods was conducted, and the microstructure and mechanical properties of the resultant joints in as-welded and post-weld heat treatment (PWHT) states were investigated. The martensitic transformation occurred and brittle TiC phase formed near the interface due to C agglomeration, which degraded the joint strength and increased the microhardness at the interface in as-welded state. Feathery and Widmanstatten structure generated near the interface on TiAl alloy side. After PWHT at 580 °C and 630 °C for 2 h, the sorbite formed and C dispersed at the interface, leading to the increase of the joint strength from 86 MPa in as-welded state to 395 MPa and 330 MPa, respectively. The heat-treated specimen fractured with quasi-cleavage features through the zone 1 mm away from the interface on TiAl alloy side, but the as-welded specimen failed through the interface.