火焰矫正对屈服强度900 MPa级低合金高强钢焊接接头组织与性能的影响

Influence of flame correction on microstructure and properties of welded joints of 900 MPa class yield high-strength and low-alloy steel

对屈服强度900 MPa级的高强度钢焊接接头进行加热温度为700℃的模拟火焰矫正,发现其焊接热影响过热区出现了大量的M-A组元,焊接接头强度基本不变,但焊接热影响区低温冲击韧性下降45.3%。结果表明:屈服强度900 MPa级高强钢高强钢宜采用机械矫正,若采用火焰矫正,需控制好加热温度。

When welded joints of 900 MPa class yield high-strength and low-alloy steels are flame heated to 700℃,a lot of M-A are found in the welding heat affected zone. The strength of the welded joints does not change basically ,but the low temperature impact toughness of the welding heat affected zone declines by 45.3%. The results show that mechanical correction is more suitable for high- strength and low-alloy steel than flame correction. It is necessary to control the heating temperature if using flame correction.