Hard-facing alloys having improved crack resistance

B - Operations – Transporting – 23 – K

Patent

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B23K 35/30 (2006.01) B23K 35/02 (2006.01) C22C 38/18 (2006.01) C22C 38/20 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01)

Patent

CA 2642767

Weld deposit compositions with improved crack resistance, improved wear resistance, and improved hardness are provided by controlling matrix grain size and balancing Titanium and/or Niobium with Carbon and/or Boron content. Additionally, the presence of coarse chromium carbides is drastically decreased to reduce the amount of check-cracking. Preferably, the weld deposit is produced from a flux-cored or metal-cored wire. The weld deposit characteristics include a matrix having a fine grain size, small evenly dispersed carbides within the matrix, and a small amount of Carbon in the matrix.

L'invention concerne des compositions de dépôt de soudure, à résistance améliorée aux fissures, et à dureté améliorée par régulation de la taille granulaire de la matrice et par équilibrage du titane et/ou du niobium avec la teneur en carbone et/ou en bore. En outre, la présence de carbures de chrome grossiers est considérablement réduite afin de diminuer la quantité de fissures se développant en perpendiculaire des cordons de soudure et accélérant leur rupture par usure. Le dépôt de soudure est, de préférence, produit à partir d'un fils à noyau métallique ou d'un fils fourré. Les caractéristiques du dépôt de soudure comprennent une matrice à taille granulaire fine, des petits carbures dispersés de manière égale dans la matrice et une petite quantité de carbone dans la matrice.

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