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Development of High-Strength Steel Wire with Superior Weldability

机译：焊接性强的高强度钢丝的开发

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High-carbon steel wires, such as piano, hard-drawn, or oil-tempered wire, are used for automotive and electronic parts. Despite their outstanding advantages in strength, ductility, and fatigue resistance, these wires are susceptible to fracture due to the brittle as-quenched martensite structure formed by welding. To overcome this problem, we have developed a high-strength steel wire that consists of a bainitic matrix phase to enhance weldability, by adding carbide former elements to low-carbon steel. The developed wire features 1) a finely recrystallized bainite phase in place of the brittle martensite phase even after welding treatment, 2) work hardening behavior and tensile strength equal to and 3) a softening resistance superior to those of a piano wire, 4) a low degradation in the tensile strength (approx. 4%) after welding, and 5) a fatigue limit equivalent to that of a piano wire after 2 × 106 rotational bending. Sumitomo (SEI) Steel Wire Corp. has already started supplying the wire and is currently working to broaden its application field.
机译：高碳钢丝，例如钢琴，硬拉或油回火钢丝，用于汽车和电子零件。尽管它们在强度，延展性和抗疲劳性方面具有突出的优势，但是由于通过焊接形成的脆性的淬火马氏体组织，这些焊丝易于断裂。为了克服这个问题，我们开发了一种高强度钢丝，该钢丝由贝氏体基体相组成，可通过向低碳钢中添加碳化物形成元素来增强可焊性。所开发的焊丝具有以下特点：1）即使经过焊接处理，也能细微重结晶的贝氏体相代替脆性的马氏体相； 2）加工硬化性能和抗拉强度等于； 3）耐软化性优于钢琴线； 4）a焊接后的抗拉强度降低（约4％），并且5）相当于2×106旋转弯曲后的钢琴线的疲劳极限。住友（SEI）钢丝公司已经开始提供焊丝，并且正在努力扩大其应用范围。

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