依靠随机涨落，形成贫碳区，贝氏体铁素体在贫碳的奥氏体中形核。
Carbon-poor area forms by way of random fluctuation and carbon atom diffusion. Bainitic ferrites nucleate in carbon-poor austenite.
粒状贝氏体及粒状组织中的M-A岛不是该钢焊接热影响区过热区脆化的原因。
The M-A units in granular bainite and granular structure are not the cause of embrittlement.
试验钢由针状铁素体和少量块状铁素体组成，焊缝为典型的针状铁素体组织，焊接热影响区粗晶区以粒状贝氏体为主。
The toughness of weld metal is the highest while the coarse grained region in the HAZ is the lowest because of welding thermal cycle and formation of brittle microstructure.
应用推荐